24 science-based calculators for BMI, calories, heart health, biological age, sleep, and more. Metric & Imperial. 10 languages.
Calculate your Body Mass Index to check if you're at a healthy weight.
Estimate your body fat percentage using the US Navy circumference method.
Find your ideal body weight range using Devine, Miller, and Hamwi formulas.
Calculate your lean body mass — everything except fat tissue.
Calculate body surface area using the Mosteller formula for drug dosing.
Calculate BMI percentile for children aged 2–19 using CDC growth charts.
Calculate your waist-to-hip ratio to assess cardiovascular risk.
A simple screening tool — your waist should be less than half your height.
Calculate your Basal Metabolic Rate — calories burned at complete rest.
Find your Total Daily Energy Expenditure — how many calories you burn each day.
Calculate exactly how many calories you need to reach your weight goal.
Calculate your optimal daily protein intake based on body weight and goals.
Find how much water you should drink daily based on your weight and activity.
Calculate how many calories you burn during exercise.
Find your ideal protein, carb, and fat split for your diet and fitness goal.
Check your blood pressure category using AHA 2017 guidelines.
Find your age-based maximum heart rate using the Tanaka formula.
Find your 5-zone heart rate training ranges for fat burn and peak performance.
Estimate your VO2 Max — the gold standard of cardiovascular fitness.
Estimate your 10-year risk of heart attack using the Framingham risk score.
Estimate your maximum single-rep lifting weight using Epley, Brzycki, and other formulas.
Discover your biological age based on your lifestyle habits.
Take the ADA risk test for prediabetes and type 2 diabetes.
Find the perfect bedtime or wake-up time based on 90-minute sleep cycles.
Track your sleep deficit over multiple nights and estimate recovery time.
Compare your BMR to your age peers to find your metabolic age.
A BMI alternative that adjusts for height — more accurate for tall or short individuals.
Estimate blood alcohol content based on drinks, weight, and time.