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 — Track Loss kg/lb
Calculate your weight loss percentage from initial and current weight. Shows total loss in pounds and kilograms.
BMI Calculator — Asian Thresholds, Prime, Trefethen
Calculate BMI, BMI Prime, Ponderal Index, and Trefethen BMI. Visual gauge, weight targets, and Asian-adjusted thresholds.
Body Fat Calculator — U.S. Navy Tape Method
Estimate your body fat percentage using the U.S. Navy method. Enter your measurements for an accurate body composition assessment.
TDEE Calculator — Maintenance Calories + Macros
Find maintenance calories with 3 BMR formulas plus macros for cutting or bulking. Most adults: 1,800–2,800 cal/day. Includes goal timeline.
Calorie Calculator — Mifflin-St Jeor Daily Needs
Calculate daily calorie needs using the Mifflin-St Jeor equation. Find calories for weight loss, maintenance, and gain.
Sleep Calculator — Bedtime, Wake Time, Nap Cycles
Calculate optimal bedtimes, wake times, and nap durations based on sleep cycles. Includes age-based sleep recommendations.
Running Pace Calculator — Race Predictor + Splits
Calculate running pace with race time prediction (Riegel formula), training pace zones, and per-mile/km splits.
Macro Calculator — Protein, Carbs, Fat from TDEE
Calculate daily macros with built-in TDEE. Enter body stats or calories directly to get protein, carbs, and fat targets.
BAC Calculator — Blood Alcohol from Drinks & Weight
Estimate blood alcohol content based on drinks, weight, gender, and time elapsed. Educational use only.
Period Calculator — Cycle, Ovulation, Fertile Window
Track menstrual cycle and predict next period. Calculate fertile window and ovulation dates for the next 6 months.
Pregnancy Calculator — Due Date from LMP or Conception
Calculate pregnancy due date from LMP or conception. Track gestational age, trimesters, and milestones.
Conception Calculator — Estimate from Due Date or LMP
Estimate conception date from due date, last period, or ultrasound. Includes the fertile window and full timeline.
Bra Size Calculator — US, UK, EU, Australian Sizing
Calculate bra size from bust and band measurements. Convert between US, UK, EU, and Australian sizing standards.
Lean Body Mass Calculator — Boer, James, Hume
Calculate lean body mass using Boer, James, and Hume formulas. Estimate fat-free mass from height, weight, and body fat.
Body Surface Area Calculator — 8 Clinical Formulas
Calculate body surface area using 8 formulas: Du Bois, Mosteller, Haycock, and more. Used for drug dosing and clinical assessments.
Ideal Weight Calculator — 4 Formulas + Healthy BMI
Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas. Compare results with healthy BMI range.
BMR Calculator — Basal Metabolic Rate (Mifflin-St Jeor)
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. See daily calorie needs for 6 activity levels.
Army Body Fat Calculator — AR 600-9 Tape Test
Calculate body fat using the Army tape test method (AR 600-9). Check compliance with military body composition standards.
1RM Calculator — One Rep Max + Training % Table
Calculate one rep max from weight and reps. Get percentage-based training recommendations across 5 formulas.
GFR Calculator — CKD-EPI 2021, MDRD, Cockcroft-Gault
Estimate glomerular filtration rate using CKD-EPI 2021, MDRD, and Cockcroft-Gault. Includes pediatric Schwartz formula.
Calories Burned Walking — Pace, Weight, MET-Based
Calculate calories burned walking based on pace, body weight, and duration. Uses MET values from the Compendium of Physical Activities.