Health & Fitness Calculators

Free health and fitness calculators. Check your BMI, estimate body fat percentage, calculate your TDEE, and plan your nutrition.

Weight Loss Percentage Calculator

Calculate your weight loss percentage from initial and current weight. Shows total loss in pounds and kilograms.

Calculate BMI, BMI Prime, Ponderal Index, and Trefethen BMI. Visual gauge, weight targets, and Asian-adjusted thresholds.

Estimate your body fat percentage using the U.S. Navy method. Enter your measurements for an accurate assessment.

Calculate TDEE with 3 BMR formulas, macro breakdown for cutting/bulking, body composition, and goal timeline.

Calculate daily calorie needs using the Mifflin-St Jeor equation. Find calories for weight loss, maintenance, and gain.

Calculate optimal bedtimes, wake times, and nap durations based on sleep cycles. Includes age-based sleep recommendations.

Calculate running pace with race time prediction (Riegel formula), training pace zones, and per-mile/km splits.

Calculate daily macros with built-in TDEE. Enter body stats or calories directly to get protein, carbs, and fat targets.

Estimate blood alcohol content based on drinks, weight, gender, and time elapsed.

Track menstrual cycle and predict next period. Calculate fertile window and ovulation dates.

Calculate pregnancy due date from LMP or conception. Track gestational age and milestones.

Estimate conception date from due date, last period, or ultrasound. Includes fertile window.

Calculate bra size from bust and band measurements. Convert between US, UK, EU, and Australian sizing.

Calculate lean body mass using Boer, James, and Hume formulas. Estimate fat-free mass from height, weight, and body fat.

Calculate body surface area using 8 formulas: Du Bois, Mosteller, Haycock, and more. Used for drug dosing and clinical assessments.

Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas. Compare results with healthy BMI range.

Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. See daily calorie needs for 6 activity levels.

Calculate body fat using the Army tape test method (AR 600-9). Check compliance with military body composition standards.

Calculate one rep max from weight and reps. Get percentage-based training recommendations.

Estimate glomerular filtration rate using CKD-EPI 2021, MDRD, and Cockcroft-Gault. Includes pediatric Schwartz formula.

Calculate calories burned walking based on pace, body weight, and duration. Uses MET values from the Compendium of Physical Activities.