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Financial Mortgage Calculator — Calculate your monthly mortgage payment including principal, interest, property tax, home insurance, and HOA — with a full amortization schedule and interactive chart. Loan Calculator — Universal loan calculator with monthly payment, amortization schedule, and total interest. Auto Loan Calculator — Calculate car loan payments including down payment, trade-in, and sales tax. Interest Calculator — Calculate compound interest with optional monthly contributions over any period. Payment Calculator — Solve for monthly payment on any fixed-rate loan or installment plan. Retirement Calculator — Project retirement savings growth and estimate the nest egg at your target retirement age. Amortization Calculator — Generate a complete amortization schedule showing principal, interest, and balance per period. Investment Calculator — Project investment growth with starting balance, monthly contributions, and expected returns. Currency Calculator — Convert between currencies using a manually-entered exchange rate. Inflation Calculator — See the future or past purchasing power of money given an annual inflation rate. Finance Calculator — General finance calculator: present and future value with periodic contributions. Mortgage Payoff Calculator — See how extra payments shorten your mortgage and reduce total interest. Income Tax Calculator — Estimate federal income tax owed using current U.S. brackets (single filer). Compound Interest Calculator — Calculate compounded growth with optional periodic contributions. Salary Calculator — Convert between hourly, weekly, monthly, and annual pay. 401K Calculator — Project your 401(k) retirement balance from contributions and expected returns. Interest Rate Calculator — Solve for the implicit interest rate of a loan given payment and term. Sales Tax Calculator — Calculate sales tax and the total after-tax amount. House Affordability Calculator — Estimate the maximum home price you can afford based on income and debts. Savings Calculator — Project savings growth with regular monthly deposits. Rent Calculator — Determine the maximum rent you should pay based on your income. Marriage Tax Calculator — Compare combined tax filing as married versus single filers. Estate Tax Calculator — Estimate federal estate tax liability given the estate value and exemption. Pension Calculator — Project pension growth and retirement value. Social Security Calculator — Rough estimate of monthly Social Security benefit based on earnings and claiming age. Annuity Calculator — Calculate monthly annuity payout from a lump sum over a fixed period. Annuity Payout Calculator — Determine the periodic payout from an annuity at a given rate and term. Credit Card Calculator — How long it takes to pay off a credit card and total interest cost. Credit Cards Payoff Calculator — Calculate the timeline and interest cost to pay off your credit card balance. Debt Payoff Calculator — Plan how quickly you can clear a debt at a given monthly payment. Debt Consolidation Calculator — See if consolidating your debts into one loan lowers your payment or interest. Repayment Calculator — Calculate the repayment schedule of any installment loan. Student Loan Calculator — Monthly payment, total interest, and payoff time for student loans. College Cost Calculator — Project future college costs given inflation in tuition and time horizon. Simple Interest Calculator — Calculate non-compounding interest accrued on a principal. CD Calculator — Calculate the maturity value of a certificate of deposit. Bond Calculator — Price a bond from its face value, coupon rate, yield, and term. Mutual Fund Calculator — Project mutual fund growth from initial investment and monthly contributions. Roth IRA Calculator — Project tax-free Roth IRA growth. IRA Calculator — Project traditional IRA balance at retirement. RMD Calculator — Required Minimum Distribution from a retirement account based on age. VAT Calculator — Value Added Tax calculator with totals and breakdown. Cash Back or Low Interest Calculator — Compare a cash-back rebate against a lower interest rate on a new auto loan. Auto Lease Calculator — Calculate monthly lease payment from cap cost, residual, money factor, and term. Depreciation Calculator — Straight-line depreciation schedule for an asset over its useful life. Average Return Calculator — Calculate arithmetic and geometric (compound) average returns. Discount Calculator — Calculate the savings and final price for a discount or sale. Business Loan Calculator — Monthly payment and amortization for business term loans. Debt-to-Income Ratio Calculator — Calculate your DTI ratio — a key metric lenders use to evaluate loan applications. Real Estate Calculator — Calculate full mortgage costs for a real estate purchase. Take-Home-Paycheck Calculator — Estimate your take-home pay after federal, state, and FICA taxes. Personal Loan Calculator — Monthly payment and total cost for a personal loan. Boat Loan Calculator — Calculate the monthly payment for financing a boat. Lease Calculator — Calculate monthly lease payments for vehicles or equipment. Refinance Calculator — Model a refinanced mortgage and compare to your current loan. Budget Calculator — Build a quick monthly budget and see remaining cash flow. Rental Property Calculator — Cash-on-cash return, cap rate, and cash flow for a rental investment. IRR Calculator — Internal rate of return from a stream of cash flows. APR Calculator — Compute the true APR of a loan including upfront fees. FHA Loan Calculator — Estimate an FHA mortgage payment with PITI and HOA. VA Mortgage Calculator — Estimate VA loan payments with no down payment requirement. Home Equity Loan Calculator — Fixed-rate home equity loan payment and amortization. HELOC Calculator — Estimate Home Equity Line of Credit payments. Down Payment Calculator — Calculate down payment and resulting loan amount. Rent vs. Buy Calculator — Compare the cumulative cost of renting versus buying. Payback Period Calculator — How long it takes for an investment to pay back its initial cost. Present Value Calculator — Calculate the present value of a future amount. Future Value Calculator — Project the future value of a present amount. Mortgage Calculator UK — UK-style mortgage payment calculator (interest-only or repayment). Canadian Mortgage Calculator — Canadian mortgage with semi-annual compounding approximation. Mortgage Amortization Calculator — Full mortgage amortization schedule and chart. Percent Off Calculator — Quick percent-off discount calculator for shopping. CAGR Calculator — Calculate Compound Annual Growth Rate (CAGR) between a starting and ending value over any time horizon. Free online CAGR formula with chart. Net Worth Calculator — Calculate your personal net worth by totaling assets (cash, investments, home, vehicles) minus liabilities (mortgage, loans, credit cards). Capital Gains Tax Calculator — Estimate federal capital gains tax on stocks, real estate, or crypto for short-term (ordinary income) vs long-term (0/15/20%) holding periods. Bi-Weekly Mortgage Calculator — Compare bi-weekly vs monthly mortgage payments and see how much interest and time you can save by paying every two weeks. Stock Profit Calculator — Calculate stock trade profit or loss including commission fees. Shows cost basis, proceeds, dollar profit, and percentage return. Crypto Profit Calculator — Calculate cryptocurrency trade profit or loss including exchange fees. Works for Bitcoin, Ethereum, Solana, and any token. FIRE Calculator (Retire Early) — Calculate how many years until you can retire early using the FIRE method (25× annual expenses, 4% safe withdrawal rate). Emergency Fund Calculator — Calculate the size of emergency fund you need and how long it will take to build at your current savings rate. NPV Calculator — Calculate the net present value of an investment by discounting a series of future cash flows at your required rate of return, with a profitability index and interactive chart. Dividend Calculator — Project dividend income and portfolio growth over time, with optional dividend reinvestment (DRIP), dividend growth, and share-price appreciation, plus yield on cost. Overtime Pay Calculator — Calculate your overtime pay and total weekly earnings from your hourly rate, regular hours, overtime hours, and overtime multiplier such as time-and-a-half or double time. Self-Employment Tax Calculator — Estimate the self-employment tax (Social Security and Medicare) owed on your net freelance or 1099 income, including the deductible employer-equivalent half. Fitness & Health BMI Calculator — Calculate Body Mass Index and find your weight category. Calorie Calculator — Estimate daily calorie needs based on age, activity, and body composition. Body Fat Calculator — Estimate body fat percentage using the U.S. Navy method. BMR Calculator — Basal Metabolic Rate — calories your body burns at complete rest. Calculated using the Mifflin-St Jeor equation, the current clinical standard. Macro Calculator — Daily protein, carb, and fat targets at a balanced 30/40/30 split. Ideal Weight Calculator — Estimate ideal body weight using the Devine formula. Pregnancy Calculator — Estimate due date and current gestational age from LMP. Pregnancy Weight Gain Calculator — Recommended weight gain range during pregnancy by pre-pregnancy BMI. Pregnancy Conception Calculator — Estimate likely conception date from LMP. Due Date Calculator — Estimate baby due date from last menstrual period. Pace Calculator — Running/walking pace, speed, and time for a given distance. Army Body Fat Calculator — Body fat estimate using the U.S. Army tape method. Carbohydrate Calculator — Daily carbohydrate target in grams. Lean Body Mass Calculator — Estimate lean body mass using the Boer formula. Healthy Weight Calculator — Recommended weight range based on height. Calories Burned Calculator — Calories burned during exercise using MET values. One Rep Max Calculator — Estimate 1RM using the Epley formula. Target Heart Rate Calculator — Aerobic training zone calculator from age. Protein Calculator — Daily protein needs based on weight and activity level. Fat Intake Calculator — Recommended daily fat in grams. TDEE Calculator — Total Daily Energy Expenditure from BMR and activity. Ovulation Calculator — Estimate ovulation date from LMP. Conception Calculator — Estimate likely conception date. Period Calculator — Predict the next period date from cycle length. GFR Calculator — Glomerular Filtration Rate (CKD-EPI 2021 formula). Body Type Calculator — Identify body shape from bust, waist, and hip measurements. Body Surface Area Calculator — Body surface area in square meters (Mosteller formula). BAC Calculator — Estimated blood alcohol concentration. Anorexic BMI Calculator — Calculates BMI to flag clinically underweight ranges. Weight Watcher Points Calculator — Legacy WW points estimate from calories, fat, and fiber. Overweight Calculator — BMI-based overweight check. Water Intake Calculator — Calculate daily water intake needs based on body weight, exercise level, and climate. Recommendations in mL, liters, fl oz, and cups. Macro Calculator by Goal (Cut, Bulk, Maintain) — Calculate daily macronutrient targets (protein, carbs, fat) for cutting, bulking, or maintaining weight, starting from your TDEE. VO2 Max Calculator — Estimate VO2 max (maximal oxygen uptake) from a Cooper 12-minute run test or 1.5-mile run time. Includes fitness category by age and sex. Wilks Score Calculator — Calculate powerlifting Wilks score from bodyweight and total (squat + bench + deadlift). Strength category included. Waist-to-Hip Ratio Calculator — Calculate your waist-to-hip ratio (WHR) and see your associated health-risk category, based on World Health Organization cut-off points for men and women. Waist-to-Height Ratio Calculator — Calculate your waist-to-height ratio (WHtR) and health-risk category using the simple, evidence-based rule that waist circumference should be less than half your height. Cholesterol Ratio Calculator — Calculate your total-to-HDL, LDL-to-HDL, and triglyceride-to-HDL cholesterol ratios plus your non-HDL cholesterol from a standard lipid panel. Smoking Cost Calculator — Calculate the daily, monthly, annual, and long-term cost of smoking based on cigarettes per day, pack size, and price per pack — a powerful motivator to quit. Math Scientific Calculator — Evaluate scientific expressions (e.g., 2*sin(0.5)+sqrt(9)). Fraction Calculator — Add two fractions and reduce the result. Percentage Calculator — Find a percentage and reverse-calculate. Triangle Calculator — Compute triangle perimeter and area from three sides (Heron's formula). Volume Calculator — Volume of common 3D shapes. Standard Deviation Calculator — Mean, variance, and standard deviation of a sample. Random Number Generator — Generate a random integer in a range. Number Sequence Calculator — Generate an arithmetic sequence. Percent Error Calculator — Percent difference between actual and expected. Exponent Calculator — Raise a base to an exponent. Binary Calculator — Convert decimal to binary, hex, and octal. Hex Calculator — Convert hexadecimal to decimal and binary. Half-Life Calculator — Radioactive / pharmacokinetic half-life decay. Quadratic Formula Calculator — Solve ax² + bx + c = 0. Slope Calculator — Slope and equation of a line through two points. Log Calculator — Logarithm of any base. Area Calculator — Area of common 2D shapes. Sample Size Calculator — Required sample size for a survey at given margin of error. Probability Calculator — AND / OR of two independent events. Statistics Calculator — Mean, median, mode, range from a data set. Mean, Median, Mode, Range Calculator — Compute the four basic measures of central tendency. Permutation and Combination Calculator — P(n,r) and C(n,r) from n and r. Z-score Calculator — Z-score of a value relative to a distribution. Confidence Interval Calculator — Confidence interval for a mean given sample stats. Ratio Calculator — Simplify a ratio. Distance Calculator — Distance between two points in a plane. Circle Calculator — Area, circumference, and diameter from radius. Surface Area Calculator — Surface area of common 3D shapes. Pythagorean Theorem Calculator — Solve for the hypotenuse from two legs. Right Triangle Calculator — Right triangle hypotenuse from two legs. Root Calculator — Compute n-th root of a value. Least Common Multiple Calculator — LCM of a list of integers. Greatest Common Factor Calculator — GCF of a list of integers. Factor Calculator — All factors of an integer. Rounding Calculator — Round a number to a specified decimal place. Matrix Calculator — Add two 2×2 matrices (semi-colon-separated rows). Scientific Notation Calculator — Convert a number into scientific notation. Big Number Calculator — Add two arbitrary-precision integers using BigInt. Prime Factorization Calculator — Prime factor decomposition of an integer. Common Factor Calculator — Greatest common factor of a list of integers. Basic Calculator — Quick arithmetic expression evaluator. Long Division Calculator — Quotient and remainder of an integer division. Average Calculator — Arithmetic mean of a list of numbers. P-value Calculator — 2-tailed p-value from a z-score (normal approximation). Trigonometry Calculator — Compute sine, cosine, and tangent of any angle in degrees or radians. Includes degree-radian conversion. Vector Calculator — Vector addition, dot product, cross product, and magnitude for 2D and 3D vectors. Complex Number Calculator — Add, subtract, multiply, and divide complex numbers. Converts between rectangular (a + bi) and polar (r ∠ θ) form. Combinatorics Calculator — Calculate combinations C(n,k), permutations P(n,k), and total subsets 2^n. For probability, statistics, and counting problems. Percentage Change Calculator — Calculate the percentage increase or decrease between two numbers, along with the absolute change and whether the value rose or fell. Significant Figures Calculator — Count the number of significant figures in a value and round any number to a chosen number of significant figures, with scientific-notation output. Proportion Calculator — Solve a proportion of the form A/B = C/x for the unknown value using cross-multiplication, with a decimal ratio and a verification check. Science & Engineering Kinetic Energy Calculator — Calculate the kinetic energy of a moving object from its mass and velocity using KE = ½mv². Potential Energy Calculator — Calculate gravitational potential energy from mass, height, and gravitational acceleration using PE = mgh. Force Calculator (F = ma) — Calculate force from mass and acceleration using Newton's second law, F = ma, in newtons. Projectile Motion Calculator — Calculate the range, maximum height, and time of flight of a projectile launched at a given speed and angle (ignoring air resistance). Free Fall Calculator — Calculate the fall time and impact velocity of an object dropped from a height under gravity, ignoring air resistance. Ideal Gas Law Calculator — Solve the ideal gas law PV = nRT for the number of moles from pressure, volume, and temperature. pH Calculator — Calculate pH, pOH, and hydroxide concentration from the hydrogen-ion concentration of a solution. Solution Dilution Calculator — Calculate the final volume and the amount of solvent to add to dilute a stock solution to a target concentration using C₁V₁ = C₂V₂. Wavelength & Frequency Calculator — Convert between the wavelength and frequency of electromagnetic radiation using c = fλ, and get the photon energy. Pendulum Calculator — Calculate the period and frequency of a simple pendulum from its length and gravitational acceleration. Hooke's Law Calculator — Calculate spring force and stored elastic energy from the spring constant and displacement using Hooke's law, F = kx. Wire Gauge (AWG) Calculator — Look up the diameter, cross-sectional area, and approximate ampacity of a copper wire by its American Wire Gauge (AWG) size. LED Resistor Calculator — Calculate the series resistor value and power rating needed to safely drive an LED from a supply voltage. Decibel Calculator — Calculate the ratio of two power or voltage levels in decibels (dB) using the standard logarithmic formulas. Specific Heat Calculator — Calculate the heat energy required to change a substance's temperature using Q = mcΔT, from mass, specific heat capacity, and temperature change. Capacitor Energy Calculator — Calculate the energy stored and the charge held by a capacitor from its capacitance and the voltage across it. Voltage Divider Calculator — Calculate the output voltage of a resistive voltage divider from the input voltage and the two resistor values. Density Calculator — Density = mass / volume. Speed Calculator — Average speed from distance and time. Ohms Law Calculator — Resistance and power from voltage and current. Resistor Calculator — Resistor value from 4-band color code. Voltage Drop Calculator — Voltage drop over a copper wire run. Molarity Calculator — Molar concentration of a solution. Molecular Weight Calculator — Molecular weight from a simple chemical formula. Developer IP Subnet Calculator — Subnet mask and host count from a CIDR prefix. Password Generator — Generate a strong random password. Bandwidth Calculator — Time to transfer a file at a given bandwidth. Base64 Encode / Decode — Base64-encode or decode a string. URL Encode / Decode — URL-encode or decode a string. Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal. Enter a value in any base and see all four representations at once. Binary Calculator — Add, subtract, multiply, or divide two binary numbers and see the result in both binary and decimal. Bitwise Calculator — Compute bitwise AND, OR, XOR, NOT, and bit shifts on two integers — the operations behind flags, masks, and low-level code. Hex to RGB Color Converter — Convert a hex color code like #1f6feb to RGB and HSL values for CSS, design tools, and graphics work. RGB to Hex Color Converter — Convert RGB color values to a hex code and HSL — handy for CSS, design handoffs, and graphics editors. HSL to RGB Color Converter — Convert HSL color values to RGB and hex codes for use in CSS and design tools. Color Contrast Checker — Check the contrast ratio between two colors against WCAG 2.1 AA and AAA accessibility thresholds. Unix Timestamp Converter — Convert a Unix epoch timestamp to a human-readable date, and convert a date back to a timestamp. UUID Generator — Generate random version-4 UUIDs (GUIDs) for database keys, API tokens, and test data — up to 50 at once. Modulo Calculator — Find the remainder and integer quotient of a division — the modulo operation used throughout programming. PX to REM Converter — Convert CSS pixel values to rem and em units based on your root font size for responsive, accessible layouts. Data Storage Converter — Convert digital storage units — bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Random Number Generator — Generate random integers within a range — for testing, sampling, giveaways, and simulations. URL Slug Generator — Turn any title or sentence into a clean, URL-safe slug for blog posts, pages, and permalinks. Word & Character Counter — Count words, characters, sentences, and estimated reading time for any block of text. Lorem Ipsum Generator — Generate placeholder Lorem Ipsum text — choose how many paragraphs and words per paragraph for mockups and designs. Password Entropy Calculator — Estimate password strength in bits of entropy and approximate brute-force crack time from length and character set. Uptime SLA Calculator — Convert an uptime SLA percentage like 99.9% into allowed downtime per day, month, and year. IP to Binary Converter — Convert an IPv4 address to its binary, hexadecimal, and 32-bit integer representations. Scientific Notation Converter — Convert numbers between standard, scientific, and engineering notation. Cron Expression Calculator — Translate a standard 5-field cron expression into a plain-English schedule, with a field-by-field breakdown and a syntax check — all in your browser. JWT Decoder — Decode a JSON Web Token (JWT) to inspect its header and payload claims and check the expiry, entirely in your browser — the token is never sent anywhere. Regex Tester — Test a regular expression against sample text in your browser, using the native JavaScript regex engine, and see the match count and every match found. Text Case Converter — Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case instantly in your browser — handy for code, slugs, and content. Business & Marketing CPM Calculator — Calculate CPM (cost per thousand impressions) for an ad campaign from the total spend and impressions, or work back to spend or impressions. CPC Calculator — Calculate cost per click (CPC) from your total ad spend and the number of clicks, a core metric for search and paid-social campaigns. CPA Calculator — Calculate cost per acquisition (CPA) — the average cost to win one conversion — from your ad spend and number of conversions. CTR Calculator — Calculate click-through rate (CTR) from clicks and impressions to gauge how compelling an ad, email, or search listing is. Conversion Rate Calculator — Calculate conversion rate from conversions and total visitors, and see how many visitors it takes on average to produce one conversion. ROAS Calculator — Calculate return on ad spend (ROAS) from revenue and ad spend, expressed as a ratio and a percentage, with the resulting profit. Customer Lifetime Value (LTV) Calculator — Estimate customer lifetime value from average order value, purchase frequency, customer lifespan, and gross margin. Customer Acquisition Cost (CAC) Calculator — Calculate customer acquisition cost from sales and marketing spend and the number of new customers, plus the crucial LTV-to-CAC ratio. Churn Rate Calculator — Calculate customer churn rate and its mirror, retention rate, from the customers you started with and the number you lost in a period. MRR & ARR Calculator — Calculate monthly recurring revenue (MRR) and annual recurring revenue (ARR) from your number of customers and average revenue per user. Average Order Value (AOV) Calculator — Calculate average order value from total revenue and number of orders — a key lever for ecommerce growth. Inventory Turnover Calculator — Calculate inventory turnover ratio and days-inventory-outstanding from cost of goods sold and average inventory. Reorder Point Calculator — Calculate the inventory reorder point from daily demand, supplier lead time, and safety stock, so you reorder before running out. Profit Margin Calculator — Calculate gross profit and profit margin percentage from total revenue and total costs for a product, order, or business. Freelance Hourly Rate Calculator — Work out the hourly rate a freelancer needs to charge to hit a target salary after business expenses, given realistic billable hours. A/B Test Significance Calculator — Compare two variants in an A/B test and check whether the difference in conversion rate is statistically significant using a two-proportion z-test. PTO Accrual Calculator — Calculate accrued paid time off from an accrual rate per pay period and the number of periods worked, in both hours and days. Margin Calculator — Profit margin and markup calculator for retail pricing. ROI Calculator — Return on investment for a single investment. Break-Even Calculator — Find the number of units and revenue you need to sell to cover fixed and variable costs, plus the contribution margin per unit and as a percentage. Commission Calculator — Calculate sales commission from sale amount and commission rate. Construction & DIY Drywall Calculator — Calculate how many drywall sheets, screws, and joint compound you need for a room from the total wall (and ceiling) area and sheet size. Flooring Calculator — Work out how many boxes of laminate, hardwood, vinyl, or tile flooring you need from the room area, the box coverage, and a waste allowance. Carpet Calculator — Convert a room area in square feet to the square yards carpet is usually sold and priced in, and estimate the total material cost. Board Feet Calculator — Calculate board feet of lumber from the thickness, width, and length of a board and the number of pieces, plus the total cost at a price per board foot. Deck Boards Calculator — Estimate how many deck boards, the total linear feet, and the fasteners needed to cover a deck of a given size, allowing for the gap between boards. Fence Calculator — Estimate the posts, rails, and pickets needed to build a fence from the total run length, the post spacing, and your picket width and gap. Brick Calculator — Calculate how many bricks and how much mortar you need for a wall from its area, the bricks per square foot, and a waste allowance. Rebar Calculator — Calculate the number of rebar pieces and total linear footage for a slab or footing grid from its dimensions and the bar spacing. Sod Calculator — Calculate how many rolls and pallets of sod you need to cover a lawn area, including a waste allowance for trimming around edges and curves. Topsoil Calculator — Calculate how many cubic yards, cubic feet, and bags of topsoil you need to cover an area to a chosen depth. Plywood Sheet Calculator — Estimate how many 4×8 plywood or OSB sheets you need to cover a wall, floor, or roof area, with a waste allowance and total cost. Wall Framing (Studs) Calculator — Calculate the number of studs and the plate linear footage for a framed wall from its length and the stud spacing (16″ or 24″ on-center). Roof Pitch Calculator — Convert a roof rise and run into pitch (x-in-12), the roof angle in degrees, and the slope factor used to convert footprint area to actual roof area. Asphalt Calculator — Estimate the tons and cubic yards of hot-mix asphalt needed to pave a driveway or lot from the area, compacted thickness, and mix density. Wallpaper Calculator — Estimate how many rolls of wallpaper you need to cover your walls from the total wall area, the usable coverage per roll, and a waste allowance for pattern matching. Baluster Spacing Calculator — Calculate how many balusters a railing needs and their on-center spacing to meet the 4-inch maximum gap building-code requirement. Ramp Slope (ADA) Calculator — Calculate the ramp length and angle needed for a given rise using a slope ratio, defaulting to the ADA-recommended 1:12 (one foot of ramp per inch of rise). Concrete Calculator — Cubic yards of concrete required for a slab. Roofing Calculator — Roof area in square feet and "squares" for material estimates. Tile Calculator — Number of tiles required (with 10% waste). Mulch Calculator — Cubic yards of mulch for a garden bed. Gravel Calculator — Cubic yards of gravel for a project. Paint Calculator — Calculate gallons of paint needed for a room based on wall dimensions, doors, windows, and number of coats. Stair Calculator — Number and dimensions of stairs from total rise and run. Square Footage Calculator — Area of a rectangular space in square feet. BTU Calculator — Required AC BTU for a given room size. Home, Garden & Energy Pool Volume Calculator — Calculate the volume of a swimming pool in gallons and litres from its dimensions and shape — essential for dosing chemicals correctly. Pool Chlorine Calculator — Estimate how much liquid chlorine to add to raise your pool's free chlorine by a target amount, based on the pool volume and product strength. Grass Seed Calculator — Calculate how much grass seed you need to sow or overseed a lawn from its area and the recommended seeding rate. Fertilizer Calculator — Calculate how much fertilizer product to apply to deliver a target amount of nitrogen per 1,000 square feet, based on the fertilizer's N content. Raised Bed Soil Calculator — Calculate how much soil a raised garden bed needs, in cubic feet, cubic yards, and bags, from its length, width, and depth. Firewood Cord Calculator — Calculate how many cords (and face cords) of firewood a stack contains from its length, height, and depth. Propane Tank Calculator — Estimate the gallons of propane available in a tank from its capacity and gauge reading, and how long it will run an appliance. Solar Panel Calculator — Estimate the solar system size and number of panels needed to offset your electricity use, from monthly kWh, local sun hours, and panel wattage. Appliance Energy Cost Calculator — Calculate the daily, monthly, and yearly cost of running an appliance from its wattage, hours of use, and your electricity rate. kWh Cost Calculator — Calculate the cost of a given number of kilowatt-hours of electricity at your utility rate, and the energy you get for a set budget. Water Usage Cost Calculator — Calculate the cost of water use from the gallons consumed and your utility's price per 1,000 gallons. Generator Sizing Calculator — Estimate the generator size you need from the total running wattage of your appliances plus the starting surge of the largest motor. LED Savings Calculator — Calculate the annual electricity savings from switching incandescent or halogen bulbs to LEDs, across any number of bulbs. Electricity Calculator — Monthly electricity cost for a single appliance. Cooking & Kitchen Recipe Scaler Calculator — Scale any recipe up or down between serving sizes and instantly convert a single ingredient amount to the new quantity. Baking Pan Conversion Calculator — Convert a recipe between baking pans of different sizes by comparing their surface areas, so batter depth and bake time stay about the same. Cups to Grams Calculator — Convert cups to grams and ounces for common baking ingredients like flour, sugar, butter, and more, using each ingredient's density. Butter Converter — Convert butter between sticks, cups, tablespoons, grams, and ounces — handy when a recipe uses different units than your packaging. Oven Temperature Converter — Convert oven temperatures between Fahrenheit, Celsius, and UK gas marks so you can follow any recipe with your oven's dial. Sourdough Hydration Calculator — Calculate the hydration percentage of a sourdough (or any bread) dough, including the flour and water contributed by your starter. Pizza Dough Calculator — Calculate the flour, water, salt, and yeast for any number of pizza dough balls at a chosen ball weight and hydration, using baker's percentages. Coffee to Water Ratio Calculator — Calculate how many grams of coffee to use for a given amount of water at your preferred brew ratio, from strong to mild. Brine Calculator — Calculate how much salt and sugar to dissolve for a wet brine from the amount of water, for juicier poultry, pork, and other meats. Meat Roasting Time Calculator — Estimate roasting time for turkey, chicken, beef, pork, and ham from the weight and doneness, plus recommended resting time. Cake Serving Size Calculator — Estimate how many servings a cake pan yields from its surface area and the size of each slice, for party- or wedding-style portions. Air Fryer Conversion Calculator — Convert conventional oven temperature and time to air fryer settings by lowering the temperature and shortening the cook time. Yeast Converter — Convert between active dry, instant, and fresh (cake) yeast so you can use whatever type you have on hand in any recipe. Alcohol Dilution Calculator — Calculate how much water to add to dilute a spirit from its current ABV to a target ABV, using the dilution formula C₁V₁ = C₂V₂. Cooking Conversion Calculator — Convert between cups, tablespoons, teaspoons, milliliters, liters, fluid ounces, pints, quarts, and gallons — plus Fahrenheit to Celsius. Automotive & Vehicles MPG Calculator — Calculate your car's fuel economy in miles per gallon from the miles driven and gallons used, plus the cost per mile at your fuel price. Trip Fuel Cost Calculator — Estimate the fuel needed and the total cost of a trip from the distance, your vehicle's MPG, and the price of fuel. EV Charging Cost Calculator — Calculate the cost and time to charge an electric vehicle from the energy added, your electricity rate, and the charger's power, plus cost per mile. EV vs Gas Cost Calculator — Compare the fuel cost per mile of an electric vehicle against a gas car, and see how much you would save over a year of driving. Gear Ratio Calculator — Calculate the gear ratio between a driving and driven gear from their tooth counts, and see whether the pairing is an overdrive or a reduction. Tire Size Comparison Calculator — Compare two tire sizes (width/aspect/rim) to see the difference in overall diameter and the resulting speedometer error. Speedometer Error Calculator — Calculate your true speed and the speedometer error after changing tire diameter, from the original diameter, the new diameter, and the indicated speed. 0–60 mph Estimator — Estimate a car's 0–60 mph time from its horsepower and weight, along with the power-to-weight ratio — a rough guide, not a dyno figure. Engine Displacement Calculator — Calculate total engine displacement from the bore, stroke, and number of cylinders, expressed in cc, liters, and cubic inches. Compression Ratio Calculator — Calculate an engine's compression ratio from the cylinder swept volume and the clearance (combustion-chamber) volume. Towing Capacity Calculator — Estimate the maximum trailer weight you can tow from your vehicle's gross combined weight rating, curb weight, and the payload you're carrying. Vehicle Wrap Area Calculator — Estimate the square footage of vinyl needed to wrap a vehicle based on its type, including a waste allowance for compound curves and mistakes. Road Trip Cost Calculator — Estimate the total cost of a road trip including fuel, food, and lodging, from the distance, fuel economy, prices, and number of days. Horsepower Calculator — Horsepower from torque and RPM. Engine Horsepower Calculator — Engine horsepower from torque and RPM. Gas Mileage Calculator — Miles per gallon from miles driven and gallons used. Fuel Cost Calculator — Estimate fuel cost for a trip from distance, MPG, and gas price. Tire Size Calculator — Overall diameter from a P-metric tire size. Mileage Calculator — Fuel economy from miles and gallons. Education & Academic Weighted GPA Calculator — Calculate a weighted GPA that gives extra points for Honors and AP/IB courses, alongside the unweighted GPA, from a list of grades and credits. Cumulative GPA Calculator — Combine your prior cumulative GPA with the current term to find your new overall cumulative GPA and total credits. Semester Grade Calculator — Calculate your overall course grade from weighted categories such as homework, quizzes, exams, and projects. Test Grade Calculator — Turn the number of questions and the number wrong into a percentage score and letter grade — the classic teacher's grading tool. Grade Curve Calculator — Apply a flat curve that lifts the highest score in the class to 100% and raises every other score by the same amount. Reading Time Calculator — Estimate how long a piece of text takes to read (and to read aloud) from its word count and reading speed. Words per Page Calculator — Convert a word count to an estimated number of pages for common font sizes and line spacing, or find the words needed for a target page count. Class Rank Percentile Calculator — Convert your class rank and class size into a percentile and the top-percent figure often quoted on college applications. Grade Average Calculator — Average a list of grades or scores entered as percentages, and see the corresponding letter grade. Letter Grade Calculator — Convert a percentage score to a letter grade and its 4.0-scale GPA points using the standard US grading scale with plus/minus. GPA Calculator — Cumulative GPA from letter grades and credit hours. Grade Calculator — Test score as a percentage and letter grade. Final Grade Calculator — Find out exactly what score you need on your final exam to reach your target course grade, given your current grade and the exam's weight. Time & Date Countdown Calculator — Count down to a future date and see exactly how many days, weeks, and total hours remain until it arrives. Business Days Calculator — Count the number of business days (Monday–Friday) between two dates, excluding weekends, along with the total and weekend days. Add or Subtract Days Calculator — Add or subtract a number of days from a start date to find the resulting date and the day of the week it lands on. Week Number Calculator — Find the ISO 8601 week number for any date, along with the day of the year and the quarter. Days Until Calculator — Calculate how many days, weeks, and months are left until a specific future date such as a deadline, holiday, or event. Time Zone Meeting Planner — Convert a meeting time from one UTC offset to another so you can schedule calls across time zones without confusion. Age Difference Calculator — Calculate the difference in age between two people from their dates of birth, in years and in total days. Half Birthday Calculator — Find your half-birthday — the date exactly six months from your birthday — a fun milestone often marked for children. Work Hours Calculator — Calculate hours worked in a shift from the start and end times and any unpaid break, in both hours-and-minutes and decimal hours for payroll. Months Between Dates Calculator — Calculate the number of whole months between two dates, and the same span expressed in years and months. Age Calculator — Exact age in years and days from a date of birth. Date Calculator — Days, weeks, and difference between two dates. Time Calculator — Convert hours, minutes, and seconds into total time. Hours Calculator — Total hours between two clock times. Time Card Calculator — Total weekly hours and pay from daily shifts. Time Zone Calculator — Convert a time across time zones. Day Counter — Days between two dates. Day of the Week Calculator — Day of week for any date. Time Duration Calculator — Duration between two times (HH:MM:SS). Other Height Calculator — Convert centimeters to feet, inches, and meters. Bra Size Calculator — Estimate bra band and cup size from measurements. Dice Roller — Roll N dice of any number of sides. Conversion Calculator — Convert between common length units. Love Calculator — Just-for-fun compatibility score based on names. GDP Calculator — Gross Domestic Product from expenditure components (in billions). Shoe Size Conversion — Convert US shoe size to EU and UK. Tip Calculator — Tip, total, and per-person share. Mass Calculator — Mass from density and volume. Weight Calculator — Weight (force) from mass and gravity. Roman Numeral Converter — Convert an integer to Roman numerals. Golf Handicap Calculator — Golf handicap index from recent scores. Sleep Calculator — Suggested bedtimes for a desired wake-up time. Wind Chill Calculator — NWS wind chill formula (°F). Heat Index Calculator — Apparent temperature combining heat and humidity. Dew Point Calculator — Dew point from temperature and humidity (Magnus formula). Aspect Ratio Calculator — Calculate aspect ratios and resize images, videos, or screens while preserving proportions. Returns simplified ratio (like 16:9) and new dimensions. Pet Age Calculator (Dog & Cat Years) — Convert your dog or cat's age to human years. Dog calculation adjusts for breed size (small, medium, large, giant). Cost Per Unit Calculator — Compare two products by their true price per unit to see which is the better deal and by what percentage, no matter how different the package sizes are. TV Size & Viewing Distance Calculator — Find the optimal viewing distance for a TV by screen size and resolution, plus the exact width and height of a 16:9 panel of that diagonal size. Carbon Footprint Calculator — Estimate your annual household carbon footprint from electricity, natural gas, driving, and flights, and compare it to the US average using standard emission factors.