Health & Fitness calculators
Understand the estimate behind the number.
Explore body measurements, activity estimates and pregnancy timelines. Each tool explains its inputs and limits so you can read the result in context.
Browse the calculatorsA place to start
Tools for common questionsBMI Calculator
Calculate BMI from height and weight as a general screening reference.
Open calculator →02 / Health & FitnessTDEE Calculator
Estimate adult daily energy expenditure from resting energy and activity.
Open calculator →03 / Health & FitnessPace Calculator
Convert a duration and distance into pace and speed.
Open calculator →Start with a question
Choose a tool with a worked example, then check the units and assumptions behind the answer.
Explore health & fitness
31 toolsBody measurements
10Anorexic BMI Calculator
Calculate adult BMI and a reference weight range without diagnosing a condition.
Army Body Fat Calculator
Calculate waist-to-height ratio, with a historical body-fat estimate for comparison.
BMI Calculator
Calculate BMI from height and weight as a general screening reference.
Body Fat Calculator
Estimate adult body fat from circumference measurements.
Body Surface Area Calculator
Estimate body surface area with the Mosteller formula.
Body Type Calculator
Compare waist, hip and shoulder proportions.
Healthy Weight Calculator
Calculate adult BMI and a reference weight range without diagnosing a condition.
Ideal Body Weight Calculator
Compare formula-based weight estimates using metric or US measurements.
Lean Body Mass Calculator
Estimate lean mass from body weight and known body fat.
Overweight Calculator
Calculate adult BMI and a reference weight range without diagnosing a condition.
Nutrition & energy
9BMR Calculator
Estimate resting energy needs from the measurements used by the equation.
Calorie Calculator
Explore a daily calorie estimate based on your measurements and activity.
Calories Burned Calculator
Estimate exercise energy expenditure from a MET value.
Carbohydrate Calculator
Convert a chosen calorie percentage into grams.
Fat Intake Calculator
Convert a chosen calorie percentage into grams.
Macro Calculator
Convert a daily calorie target into macronutrient grams.
Protein Calculator
Convert a weight-based protein target into grams per day.
TDEE Calculator
Estimate adult daily energy expenditure from resting energy and activity.
Weight Watcher Points Calculator
Calculate a legacy nutrition-points estimate from a food label.
Pregnancy & cycle dates
7Conception Calculator
Estimate calendar dates from the first day of the last period.
Due Date Calculator
Estimate a pregnancy due date from the calendar information you provide.
Ovulation Calculator
Explore estimated cycle dates using the calendar inputs you provide.
Period Calculator
Estimate calendar dates from the first day of the last period.
Pregnancy Calculator
Estimate a pregnancy timeline from your entered dates.
Pregnancy Conception Calculator
Estimate calendar dates from the first day of the last period.
Pregnancy Weight Gain Calculator
Show a total pregnancy weight-gain reference range for a singleton pregnancy.
Activity & other estimates
5BAC Calculator
Estimate blood alcohol concentration with a simplified Widmark model.
GFR Calculator
Estimate adult kidney filtration using the 2021 CKD-EPI creatinine equation.
One Rep Max Calculator
Estimate a one-repetition maximum from a submaximal set.
Pace Calculator
Convert a duration and distance into pace and speed.
Target Heart Rate Calculator
Estimate a training range using heart-rate reserve.