Health & Fitness calculators
BMI, calories, body composition, pregnancy dates and training metrics based on published formulas.
BMI Calculator
Body mass index from your weight and height, with the standard weight category.
BMR Calculator
Basal metabolic rate — the calories your body burns at complete rest.
TDEE Calculator
Total daily energy expenditure — your true maintenance calories.
Calorie Calculator
Daily calorie target for losing, maintaining or gaining weight.
Body Fat Calculator
Estimate body fat percentage from tape measurements — the US Navy method.
Ideal Weight Calculator
Devine ideal body weight for your height, plus the healthy BMI weight range.
Macro Calculator
Split daily calories into grams of carbohydrate, protein and fat.
Protein Calculator
Daily protein target in grams, scaled to your body weight and goal.
Water Intake Calculator
Suggested daily water intake from body weight and exercise.
Ovulation Calculator
Ovulation day, fertile window and next period from your last period.
Pregnancy Due Date Calculator
Due date by Naegele's rule, plus gestational age and trimester for any date.
Conception Calculator
Work backwards from a due date to the estimated conception date.
Period Calculator
Predict your next three period start dates from your cycle length.
Pace Calculator
Running pace per kilometre and per mile, plus speed, from distance and time.
Heart Rate Zones Calculator
Five training zones from your age-predicted maximum heart rate.
VO2 Max Calculator
Estimate aerobic fitness with the Rockport one-mile walk test.
One Rep Max Calculator
Estimate your 1RM from a submaximal set — Epley and Brzycki formulas.
Sleep Calculator
Bedtimes and wake times that line up with complete 90-minute sleep cycles.
Blood Alcohol Calculator (BAC)
Estimate blood alcohol concentration with the Widmark formula.
Lean Body Mass Calculator
Lean body mass from the Boer formula, with implied fat mass.
Calories Burned Calculator
Energy cost of common activities from MET values, weight and duration.
Pregnancy Weight Gain Calculator
IOM 2009 recommended weight-gain ranges by pre-pregnancy BMI.