Fitness & Health Calculators
Body, nutrition and training. Free, browser-based calculators with the method explained.
9 calculators · Free to use · No sign-up
Fitness & Health
- BMI Calculator
Body mass index, weight ranges and screening context.
- TDEE & Calorie Calculator
Daily energy expenditure and calorie estimates.
- Body Fat Calculator
Estimate body composition from tape measurements.
- Ideal Weight Calculator
Compare four formulas and the BMI-based range.
- Macro Calculator
Turn a calorie target into carbohydrate, protein and fat.
- Water Intake Calculator
Estimate fluid intake from size and activity.
- Target Heart Rate Calculator
Explore training zones and maximum heart-rate estimates.
- Running Pace Calculator
Pace, speed and race-time estimates.
- One Rep Max Calculator
Compare estimated lifting maximums across three formulas.
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More than a number.
A calculator is most useful when you understand what goes into its result. Every tool includes its method, a worked example or reference information, and the assumptions that matter.
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Calculations run in your browser. Unit preferences may be remembered on your device.
Check the method
Use the formulas and limits to interpret each answer.