All Calculators & Tools
Science-backed fitness, nutrition, and health calculators — all free, all instant.
Fitness & Body
10 toolsTDEE Calculator
Total daily calorie burn for any goal.
BMR Calculator
Resting metabolic rate estimation.
BMI Calculator
Body Mass Index for height & weight.
Body Fat Calculator
U.S. Navy tape-measure method.
Lean Body Mass Calculator
Calculate lean mass vs fat.
Ideal Weight Calculator
Optimal body weight via validated formulas.
Healthy Weight Calculator
Determine your healthy weight range.
Army Body Fat Calculator
Military body fat standards.
Body Type Calculator
Ectomorph, mesomorph, or endomorph.
Body Surface Area Calculator
BSA for medical dosing & metrics.
Nutrition & Calories
10 toolsCalorie Calculator
Precise daily calorie needs.
Calorie Deficit Calculator
Plan your weight loss calorie target.
Reverse Dieting CalculatorNEW
Slowly increase calories after a diet.
Macro Calculator
Optimal protein, carbs & fat split.
Protein Calculator
Daily protein needs for your goal.
Carbohydrate Calculator
Daily carbohydrate intake target.
Fat Intake Calculator
Daily dietary fat needs.
Keto Macro Calculator
Macros for ketogenic diets.
Water Intake Calculator
Daily water intake needs.
Guess the Calories Game
Test your nutrition knowledge.
Weight Management
8 toolsWeight Loss Timeline
See when you'll reach your goal weight.
Calories Burned Calculator
Calories burned during exercise.
Pace Calculator
Running pace and speed.
One Rep Max Calculator
Estimate your 1RM for strength training.
Target Heart Rate Calculator
Optimal heart rate zones.
Intermittent Fasting CalculatorNEW
Track fasting and eating windows.
Sleep CalculatorNEW
Best sleep & wake times by sleep cycle.
VO2 Max CalculatorNEW
Estimate your maximal aerobic fitness.
Body Composition
2 toolsHealth & Medical
2 toolsWomen's Health
7 toolsPregnancy Calculator
Pregnancy timeline and milestones.
Due Date Calculator
Estimated delivery date.
Ovulation Calculator
Fertile window estimation.
Conception Calculator
Estimate conception date.
Period Calculator
Predict next period.
Pregnancy Weight Gain Calculator
Safe weight gain during pregnancy.
Pregnancy Conception Calculator
Conception date from due date.