Health & Fitness Calculators - BMI, Calories, Body Fat
Science-backed health tools to track your body composition, nutrition, and fitness goals.
30 calculators
Body Fat Calculator
5 methods to estimate body fat — no calipers needed
Try it free →Caloric Deficit Calculator
Find your ideal calorie deficit and weight loss timeline.
Try it free →Maintenance Calories Calculator
Advanced TDEE calculator with macros, BMI, and body composition analysis
Try it free →One Rep Max Calculator
Estimate your 1RM with 7 formulas, warm-up calculator, and strength standards
Try it free →BMI Calculator
Calculate BMI with body fat estimate, waist-to-hip ratio, and ethnic-specific thresholds
Try it free →Ideal Weight Calculator
Find your ideal weight using 7 scientific formulas
Try it free →Keto Calculator
Calculate personalized keto diet macros with food examples and electrolytes
Try it free →Lean Body Mass Calculator
Estimate your lean body mass and get actionable nutrition + training plan
Try it free →Macro Calculator
Calculate daily macros with dual BMR formulas, protein analysis, and 8 diet types
Try it free →Water Intake Calculator
Calculate your personalized daily water intake
Try it free →Sleep Calculator
Find optimal bedtime and wake-up times using sleep cycles and chronotype
Try it free →Rest Day Calculator
Should you train today? Get your readiness score with HRV and heart rate data
Try it free →Running Pace Calculator
Calculate pace, VDOT, training zones, heart rate zones, and race splits
Try it free →Protein Calculator
Calculate protein needs with meal plans and food suggestions
Try it free →Waist-to-Height Ratio Calculator
Assess cardiometabolic risk more accurately than BMI alone
Try it free →Heart Rate Zones Calculator
Personalized training zones with multiple scientific methods
Try it free →Weight Gain Calculator
Plan your weight gain with personalized calorie, macro, and body composition targets
Try it free →Weight Loss Calculator
Plan your weight loss with adaptive calorie and macro targets plus body composition tracking
Try it free →Calories Burned Calculator
Calculate how many calories you burn during any exercise or daily activity
Try it free →TDEE Calculator
Calculate total daily energy expenditure and calorie goals
Try it free →Calorie Calculator
Calculate your daily calorie needs using the Mifflin-St Jeor formula. Get maintenance, weight loss, and weight gain targets with 7-day zig-zag cycling, macro breakdown, and diet mode support including keto and high-protein plans.
Try it free →BMR Calculator
Calculate your BMR and daily calorie needs with 3 proven scientific formulas
Try it free →Pregnancy Due Date Calculator
Estimate your baby's due date with 5 calculation methods and a complete milestone timeline
Try it free →Intermittent Fasting Calculator
Calculate your fasting schedule, calories, and macros.
Try it free →Ovulation Calculator
Find your fertile days and ovulation date.
Try it free →Pregnancy Due Date Calculator
Estimate your due date and track pregnancy milestones
Try it free →Conception Date Calculator
Estimate your conception date from due date, LMP, or ultrasound.
Try it free →Implantation Calculator
Calculate your implantation window and best pregnancy test day.
Try it free →Chinese Gender Predictor
Chinese gender prediction based on the lunar calendar
Try it free →hCG Calculator
Track hCG levels and calculate doubling time with visual charts and normal range comparison
Try it free →Health & Fitness Calculators - BMI, Calories, Body Fat
Free health and fitness calculators: BMI, body fat, calorie deficit, ideal weight, macros, keto, and more. Science-backed tools with WHO standards.