Health & Fitness Calculators

22 free health and fitness calculators — BMI, BMR, TDEE, calorie deficit, water intake, calories burned, body fat, macros, sleep, life expectancy, pregnancy & due date, age, period & fertility. Clinically validated formulas.

Body Mass Index with visual gauge and healthy weight range.

Calorie Calculator

TDEE & daily calorie needs for weight loss, gain or maintenance.

Body Fat Calculator

US Navy Method body fat percentage for men and women.

Navy MethodBody Fat

Find your ideal weight using Hamwi, Devine, Miller & Robinson formulas.

Macro Calculator

Daily protein, carbs & fat targets for keto, low-carb or balanced diets.

TDEE Calculator

Total Daily Energy Expenditure with macro breakdown for your goal.

Sleep Calculator

Best bedtime or wake-up time based on 90-minute sleep cycles and your age.

Running Pace Calculator

Pace, finish time, or distance for any race — 5K, 10K, half & full marathon.

Ovulation Calculator

Fertile window and ovulation date from your last period and cycle length.

Basal Metabolic Rate — calories burned at rest using Mifflin-St Jeor equation.

Due Date Calculator

Pregnancy due date, current trimester & milestones from LMP or conception date.

PregnancyDue Date

Period Calculator

Next period date, fertile window & 6-month forecast from your cycle length.

Calories Burned Calculator

Calories burned for 40+ activities — walking, running, cycling & gym workouts.

Calorie Deficit Calculator

Daily calories to lose weight, with a projected weight-loss chart to your goal.

Weight LossDeficit

Water Intake Calculator

Personalized daily water goal in ounces, cups, liters & glasses.

Life Expectancy Calculator

Estimate your lifespan from age, sex and lifestyle — see how many years are ahead.

LongevityLifespan

GLP-1 Dose Calculator

Convert your GLP-1 dose from mg to units on a U-100 insulin syringe.

SemaglutideTirzepatide

GLP-1 Titration Schedule

Standard semaglutide & tirzepatide dose-escalation schedule and your step.

Protein Intake Calculator

Daily protein grams for fitness, muscle, fat loss, or preserving muscle on a GLP-1.

Creatine Dosage Calculator

Loading & maintenance creatine doses based on your body weight.

CreatineStrength

Pregnancy Calculator

Due date, pregnancy week & trimester from your last menstrual period.

Exact age in years, months, days, weeks and hours from your birth date.