Calorie Calculator
Estimate daily calorie needs based on age, activity, and body composition. This free online fitness & health calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
This calculator takes Sex, Weight (kg), Height (cm), Age, and Activity Multiplier as input and computes BMR and Daily Calorie Needs (TDEE). The math runs entirely in your browser the moment you change a value — nothing is sent to a server, and your inputs are never stored.
The formula used is the standard fitness & health calculation for this metric. For a full step-by-step derivation with the default values, see the Worked Example section below.
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Sex: male
- Weight (kg): 70
- Height (cm): 175
- Age: 30
- Activity Multiplier: 1.55
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Frequently Asked Questions
What does the Calorie Calculator compute?
The Calorie Calculator takes 5 input values and returns 2 results. Estimate daily calorie needs based on age, activity, and body composition.
Is my data sent to a server?
No. The Calorie Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
Can I rely on this result for medical decisions?
Results are estimates intended for educational use. Health calculations vary with individual factors that a single formula cannot capture. Always consult a qualified clinician for personal health decisions.
Reviewed against: CDC, NIH, and World Health Organization guidance. Results are estimates for educational use only — not medical advice. Consult a qualified clinician for personal health decisions.