Health & Fitness Calculators
Body metrics and daily energy estimates.
28 free calculators in this category — all run in your browser.
BMI CalculatorBody mass index with category and your healthy weight range for your height.BMR CalculatorBasal metabolic rate and total daily energy expenditure for every activity level.Calorie CalculatorDaily calorie target for losing, maintaining, or gaining weight, with macros.Body Fat CalculatorBody fat percentage from neck, waist, and hip measurements (US Navy method).Ideal Weight CalculatorIdeal body weight from the Devine formula, plus healthy ranges.Macro CalculatorEstimate daily calories and carbohydrate, protein, and fat targets from body metrics, activity, and goal.Pace CalculatorCalculate pace, speed, and predicted race times from distance and elapsed time.Running Pace CalculatorEstimate running pace, speed, and common race finish times.Pregnancy CalculatorEstimate due date, current gestational age, and ovulation from the last period date.Due Date CalculatorEstimate a due date from a last period, conception date, or current pregnancy week.Pregnancy Conception CalculatorEstimate conception timing from an estimated due date and average cycle length.Pregnancy Weight Gain CalculatorCompare pregnancy weight gain with broad guideline ranges based on pre-pregnancy BMI.Ovulation CalculatorEstimate ovulation and the fertile window from the first day of the last period.Period CalculatorEstimate the next period, period end, and fertile window from cycle history.Calories Burned CalculatorEstimate energy used during an activity from body weight, intensity, and duration.One Rep Max CalculatorEstimate a one-repetition maximum from a lift weight and reps using three common equations.Target Heart Rate CalculatorEstimate training heart-rate zones from age and optional resting heart rate.Protein CalculatorEstimate daily protein guidelines from body weight and an activity goal.Fat Intake CalculatorEstimate a daily fat-intake range from body weight using an adjustable general guideline.Carbohydrate CalculatorEstimate a daily carbohydrate guideline from body weight.TDEE CalculatorEstimate total daily energy expenditure from body measurements and activity level.Lean Body Mass CalculatorEstimate lean body mass using Boer, James, and Hume formulas.Healthy Weight CalculatorEstimate a BMI-based healthy weight range from height and compare common formula estimates.Body Surface Area CalculatorEstimate body surface area from height and weight using the Mosteller equation.Army Body Fat CalculatorEstimate body fat from circumference measurements with a Navy-style method.GFR CalculatorEstimate eGFR using the 2021 CKD-EPI race-free creatinine equation.BAC CalculatorA rough alcohol concentration estimate from body weight, drinks, and elapsed time.Sleep CalculatorPlan bedtime or wake time using approximate 90-minute sleep-cycle intervals.