15 free calculators
Fitness, Calories & Body Composition Calculators
Find adult fitness calculators for BMR, TDEE, macros, BMI, body composition and strength. Choose pounds and inches or metric units where available. Each tool includes an example and explains the limits of its estimate. These educational tools do not diagnose health conditions or prescribe a diet or exercise program.
Choose a question to explore
Understand calories and macros
Start with resting energy, add an activity estimate, then explore a macro split.
Compare body measurements
Understand what BMI and circumference estimates can and cannot tell you.
Explore training estimates
Compare strength, pulse and aerobic estimates without treating them as exercise prescriptions.
- BMR (Basal Metabolic Rate) CalculatorFree bmr (basal metabolic rate) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- TDEE (Total Daily Energy Expenditure) CalculatorFree tdee (total daily energy expenditure) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Macronutrient (Macro) CalculatorFree macronutrient (macro) calculator with worked examples, formula explanations and input checks. Open calculator →
- Body Fat Percentage Calculator (US Navy Method)Free body fat percentage calculator (us navy method) with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Lean Body Mass (LBM) CalculatorFree lean body mass (lbm) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- FFMI (Fat-Free Mass Index) CalculatorFree ffmi (fat-free mass index) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- One Rep Max (1RM) CalculatorFree one rep max (1rm) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Calorie Deficit & Weight Loss Timeline CalculatorFree calorie deficit & weight loss timeline calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- BMI (Body Mass Index) CalculatorFree bmi (body mass index) calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Waist-to-Hip Ratio CalculatorFree waist-to-hip ratio calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Protein Intake CalculatorFree protein intake calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Daily Water Intake CalculatorFree daily water intake calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Target Heart Rate Zone Calculator (Karvonen)Free target heart rate zone calculator (karvonen) with worked examples, formula explanations and input checks. Open calculator →
- VO2 Max Calculator (Cooper Test)Free vo2 max calculator (cooper test) with worked examples, formula explanations and input checks. US and metric units.Open calculator →
- Ideal Body Weight CalculatorFree ideal body weight calculator with worked examples, formula explanations and input checks. US and metric units.Open calculator →