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Health Calculators

Health calculators using age, sex, height, weight, activity, and other relevant inputs for screening and planning estimates.

BMI CalculatorCalculate adult BMI from height and weight, then use age and sex for an estimated body-fat percentage and contextual guidance.Calorie CalculatorEstimate daily maintenance calories from age, sex, height, weight, and activity level.BMR CalculatorEstimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation.Ideal Weight CalculatorCompare sex-specific adult ideal body-weight estimates from height using the Devine formula.Water Intake CalculatorEstimate daily water intake from body weight and activity adjustment.Macro CalculatorSplit daily calories into protein, carbohydrates, and fat gram targets.Pregnancy Due Date CalculatorEstimate a pregnancy due date from the first day of the last menstrual period.Body Fat Percentage CalculatorEstimate body fat percentage from BMI, age, and sex.Body Surface Area CalculatorEstimate body surface area from height and weight using common adult formulas.Sleep CalculatorFind bedtimes or wake times based on 90-minute sleep cycles.Target Heart Rate Zones CalculatorEstimate moderate and vigorous heart rate training zones from age.Running Pace CalculatorCalculate pace per kilometer, pace per mile, and average speed from distance and time.Ovulation CalculatorEstimate ovulation and fertile window dates from cycle length and last period date.Blood Pressure Category CalculatorClassify a blood pressure reading into common adult screening categories.VO2 Max EstimatorEstimate VO2 max from resting heart rate and maximum heart rate.One-Rep Max CalculatorEstimate one-rep max strength from a lifted weight and repetitions.Waist to Hip Ratio CalculatorCalculate waist-to-hip ratio and a broad screening category from waist, hip, and sex.Lean Body Mass CalculatorEstimate lean body mass from height, weight, and sex using the Boer formula.Protein Intake CalculatorEstimate daily protein target from body weight and grams per kilogram.Calorie Deficit CalculatorEstimate daily calorie deficit, weekly weight-change pace, and target-loss time.BMI Prime CalculatorCalculate BMI prime, BMI, and the body weight corresponding to BMI 25.