Health & Fitness
Health & Fitness calculators
BMI, calories, body composition and pregnancy tools.
Body Composition
BMI, body fat, lean mass, ideal and healthy weight, body type and BSA.
Nutrition & Metabolism
Calories, BMR, TDEE, macros, protein, carbs, fat and calories burned.
Pregnancy & Reproductive
Due date, conception, ovulation, period and pregnancy weight gain.
Performance & Health
One-rep max, running pace, target heart rate, eGFR and blood alcohol.
All health & fitness calculators
BMI CalculatorBody Mass Index and weight category from height and weight.Anorexic BMI CalculatorWhere a BMI sits relative to the underweight and clinical thresholds.Body Fat CalculatorBody fat percentage using the U.S. Navy circumference method.Army Body Fat CalculatorBody fat estimate by tape measurement, with Army standard limits.Lean Body Mass CalculatorLean mass and fat mass using the Boer formula.Body Surface Area CalculatorBody surface area (BSA) via the Mosteller formula.Body Type CalculatorEstimate body shape from bust, waist and hip measurements.Overweight CalculatorHow far a weight is above the healthy BMI range.Ideal Weight CalculatorIdeal body weight by four classic formulas, plus a healthy range.Healthy Weight CalculatorThe weight range for a healthy BMI (18.5–24.9) at your height.Calorie CalculatorDaily calories to maintain, lose or gain weight.BMR CalculatorBasal metabolic rate — calories burned at complete rest.TDEE CalculatorTotal daily energy expenditure from BMR and activity level.Macro CalculatorProtein, carb and fat grams for a calorie target and diet style.Protein CalculatorRecommended daily protein from body weight and goal.Carbohydrate CalculatorDaily carb grams from your calories and a chosen percentage.Fat Intake CalculatorDaily fat grams from your calories and a chosen percentage.Calories Burned CalculatorEnergy burned in an activity from its MET value, your weight and time.Weight Watcher Points CalculatorClassic food points from calories, fat and fiber.Pregnancy CalculatorDue date, current gestational age and trimester from your last period.Due Date CalculatorEstimated delivery date from the first day of your last period.Conception CalculatorLikely conception date and fertile window from your last period.Pregnancy Conception CalculatorWork backwards from a due date to the likely conception and LMP dates.Pregnancy Weight Gain CalculatorRecommended pregnancy weight gain by pre-pregnancy BMI (IOM guidelines).Ovulation CalculatorYour fertile window and ovulation day from your cycle.Period CalculatorPredict your next few period start dates from your cycle.One Rep Max CalculatorEstimate your 1RM and training percentages from a set.Pace CalculatorRunning pace and speed from distance and time.Target Heart Rate CalculatorTraining heart-rate zones using the Karvonen (heart-rate reserve) method.GFR CalculatorEstimated glomerular filtration rate (CKD-EPI 2021, race-free).Blood Alcohol (BAC) CalculatorEstimated blood alcohol concentration via the Widmark formula.