Health Calculators & Tools

Calculate Body Mass Index (BMI), daily calorie needs (TDEE), BMR, ideal body weight, water intake targets, and target heart rate zones.

Popular Tools in Health

BMI Calculator - Body mass index from height and weight, with the WHO category.
Calories Calculator - Daily calorie needs from the Mifflin-St Jeor equation and activity level.
Water Intake Calculator - A daily water target from body weight and activity level.
BMR Calculator - Basal metabolic rate — calories burned at complete rest.
Ideal Weight Calculator - A healthy weight range based on height, age and gender.
Body Fat % Calculator - Estimate body fat percentage using the US Navy method.
Pregnancy Due Date Calculator - Estimated due date from the first day of your last period.
Ovulation Calculator - Your most fertile days based on cycle length.
Period Calculator - Predict your next menstrual cycle dates.
Macro Calculator - Daily protein, carb and fat targets from your calorie goal.
Heart Rate Zone Calculator - Target heart rate zones for fat burn, cardio and peak effort.
Waist-to-Hip Ratio Calculator - A quick indicator of cardiometabolic health risk.
Sleep Cycle Calculator - Best times to fall asleep or wake up based on 90-minute sleep cycles.
Calories Burned Calculator - Calories burned walking, running or cycling a given distance and pace.
Running & Walking Pace Calculator - Pace, speed and projected finish times for 5k, 10k or marathon.
Body Surface Area (BSA) Calculator - Estimate BSA using Mosteller and Du Bois clinical formulas.
Lean Body Mass (LBM) Calculator - Calculate lean muscle mass, fat mass, and body fat % using Boer, James, and Hume clinical formulas.
Intermittent & Water Fasting Weight Loss Calculator - Estimate fat loss and body weight reduction from intermittent water fasting.
One Rep Max (1RM) Calculator - Calculate maximum 1RM lift weight for bench press, squat, and deadlift using Epley and Brzycki formulas.
Keto & Macro Ratio Split Calculator - Calculate daily protein, carb, and fat grams for Keto, Low-Carb, and High-Protein fitness diets.