Health tools
3 free health tools — no signup, instant results.
Estimate adult body measurements and energy needs while keeping their limitations visible. These calculators answer different questions; agreement between them does not turn an estimate into a diagnosis.
All health tools
Calculate your Body Mass Index (BMI) from your height and weight, and see which category you fall into — free and instant.
Estimate your body fat percentage from a few tape-measure measurements using the U.S. Navy method — no scale or scan required. Free and instant.
Estimate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) from your body stats and activity level — free and instant.
Choose a tool for your task
- BMI Calculator
- Calculate the ratio of weight to height and view standard adult categories. BMI does not measure body fat or distinguish muscle from fat.
- Body Fat Percentage Calculator
- Estimate body fat using height and tape measurements. Follow the measurement guidance carefully: moving the tape or changing its tension can change the result.
- Calorie & TDEE Calculator
- Estimate resting energy and daily expenditure using an adult equation and an activity multiplier. The multiplier is an assumption, not a measurement of your daily activity.
Check an estimate before interpreting it
- Confirm units first. Enter feet and inches separately, rather than treating 5 feet 9 inches as 5.9 feet.
- Read the formula, source links and exclusions on the selected calculator. Use consistent conditions when repeating measurements.
- Treat an unexpected value as a reason to check inputs and seek appropriate professional interpretation. Do not use an estimate alone to set a treatment or dietary plan.
What these tools can and cannot tell you
These are informational tools for adults, with exclusions described on each page. Child growth, pregnancy, athletic body composition and individual medical circumstances require different interpretation. The articles are written by a software engineer; they do not claim clinical review or medical credentials.
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