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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.
Margin Calculator — Profit margin and markup calculator for retail pricing.
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.
ROI Calculator — Return on investment for a single investment.
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.
Commission Calculator — Calculate sales commission from sale amount and commission rate.
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.

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.

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.

Other

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.
GPA Calculator — Cumulative GPA from letter grades and credit hours.
Grade Calculator — Test score as a percentage and letter grade.
Height Calculator — Convert centimeters to feet, inches, and meters.
Concrete Calculator — Cubic yards of concrete required for a slab.
IP Subnet Calculator — Subnet mask and host count from a CIDR prefix.
Bra Size Calculator — Estimate bra band and cup size from measurements.
Password Generator — Generate a strong random password.
Dice Roller — Roll N dice of any number of sides.
Conversion Calculator — Convert between common length units.
Fuel Cost Calculator — Estimate fuel cost for a trip from distance, MPG, and gas price.
Voltage Drop Calculator — Voltage drop over a copper wire run.
BTU Calculator — Required AC BTU for a given room size.
Square Footage Calculator — Area of a rectangular space in square feet.
Time Card Calculator — Total weekly hours and pay from daily shifts.
Time Zone Calculator — Convert a time across time zones.
Love Calculator — Just-for-fun compatibility score based on names.
GDP Calculator — Gross Domestic Product from expenditure components (in billions).
Gas Mileage Calculator — Miles per gallon from miles driven and gallons used.
Horsepower Calculator — Horsepower from torque and RPM.
Engine Horsepower Calculator — Engine horsepower from torque and RPM.
Stair Calculator — Number and dimensions of stairs from total rise and run.
Resistor Calculator — Resistor value from 4-band color code.
Ohms Law Calculator — Resistance and power from voltage and current.
Electricity Calculator — Monthly electricity cost for a single appliance.
Shoe Size Conversion — Convert US shoe size to EU and UK.
Tip Calculator — Tip, total, and per-person share.
Mileage Calculator — Fuel economy from miles and gallons.
Density Calculator — Density = mass / volume.
Mass Calculator — Mass from density and volume.
Weight Calculator — Weight (force) from mass and gravity.
Speed Calculator — Average speed from distance and time.
Molarity Calculator — Molar concentration of a solution.
Molecular Weight Calculator — Molecular weight from a simple chemical formula.
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.
Tire Size Calculator — Overall diameter from a P-metric tire size.
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.
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).
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.
Time Duration Calculator — Duration between two times (HH:MM:SS).
Day Counter — Days between two dates.
Day of the Week Calculator — Day of week for any date.
Cooking Conversion Calculator — Convert between cups, tablespoons, teaspoons, milliliters, liters, fluid ounces, pints, quarts, and gallons — plus Fahrenheit to Celsius.
Aspect Ratio Calculator — Calculate aspect ratios and resize images, videos, or screens while preserving proportions. Returns simplified ratio (like 16:9) and new dimensions.
Paint Calculator — Calculate gallons of paint needed for a room based on wall dimensions, doors, windows, and number of coats.
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).