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 your Body Mass Index (BMI) to check if your weight is healthy. Supports both metric and imperial units.

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

Calculate your Total Daily Energy Expenditure (TDEE) based on your BMR and activity level. Plan your calorie intake for weight goals.

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

Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Wake up feeling refreshed.

Calculate running pace per km or mile. Get splits for 5K, 10K, half marathon, and marathon.

Calculate daily macros for protein, carbs, and fat based on calories and fitness goals.

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.