Health & Fitness Calculators

BMI calculator uses weight/height² to classify you into WHO weight categories. Metric and imperial inputs are both supported.

Body fat calculator uses the U.S. Navy method to estimate fat percentage. Lean mass is shown alongside the fat percentage result.

Ideal weight calculator runs Robinson, Miller, Devine, and Hamwi formulas for your height. All four results display side-by-side.

Waist-to-hip ratio calculator divides waist by hip circumference to flag cardiovascular risk. WHO thresholds for both sexes are shown.

Lean body mass calculator uses Boer, James, and Hume formulas to estimate fat-free mass. Three results surface variation across methods.

Body Adiposity Index calculator applies hip÷height^1.5−18 to estimate body fat without a scale. Weight is not required as an input.

BMR calculator applies Mifflin-St Jeor and Harris-Benedict equations to resting calorie burn. Both results display side-by-side.

TDEE calculator multiplies your BMR by an activity factor across five tiers. The result sets your daily calorie maintenance target.

Calorie needs calculator adjusts TDEE for weight loss, maintenance, or gain. Deficit and surplus values follow safe-rate guidelines.

Macro calculator converts calories into protein, carb, and fat gram targets. Balanced, low-carb, high-protein, and keto splits included.

Keto calculator targets 75% fat, 20% protein, and 5% net carbs from your TDEE. Protein is capped to lean mass to protect ketosis.

Protein intake calculator uses weight and activity multipliers for daily gram targets. Minimum and muscle-building intakes are shown.

Water intake calculator estimates daily hydration from weight, exercise, and climate. Totals split between drinking water and food sources.

Target heart rate calculator uses the Karvonen formula and the 220-minus-age maximum. Fat-burn, aerobic, and anaerobic zones display in BPM.

Calories burned calculator applies MET values to body weight and exercise duration. MET coefficients cover 40+ standardized activity types.

One-rep max calculator estimates 1RM from a sub-maximal lift using the Epley formula. Training tables from 50–95% 1RM are auto-generated.

Pace calculator solves for pace, time, or distance from any two running variables. Split tables for 5K, 10K, and marathon are generated.

VO2 max calculator estimates aerobic capacity from the Cooper or Rockport walk test. ACSM fitness classification by age and sex is included.

Pregnancy due date calculator adds 280 days to your last period via Naegele's Rule. A trimester timeline and milestone weeks are displayed.

Ovulation calculator predicts your fertile window from cycle length and last period date. A 12-month calendar marks fertile days ahead.

Blood alcohol calculator uses the Widmark formula with gender, weight, and drink count. Time-to-sober projections accompany the BAC result.