Health Calculators
Evidence-based calculators for your health and wellness journey.
BMI
Calculate your Body Mass Index (BMI) and see where you fall on the standard BMI scale.
Calculate →Calories
Calculate your daily calorie needs (TDEE) based on your age, weight, height, sex, and activity level.
Calculate →Water Intake
Calculate your recommended daily water intake based on your weight, activity level, and climate.
Calculate →Due Date
Estimate your pregnancy due date based on your last period and cycle length.
Calculate →BMR
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor formula.
Calculate →TDEE
Calculate your Total Daily Energy Expenditure based on BMR and activity level.
Calculate →Protein Intake
Calculate your recommended daily protein intake based on weight and activity level.
Calculate →Water Intake
Calculate your recommended daily water intake based on body weight.
Calculate →Body Fat %
Estimate your body fat percentage using the US Navy circumference method.
Calculate →Ideal Weight
Estimate your ideal body weight based on height using the Devine formula.
Calculate →Macros
Calculate your daily protein, carbs, and fat targets based on your body stats, activity level, and goal.
Calculate →Calorie Deficit
Find out how many calories to eat per day to hit your target weight loss rate.
Calculate →Lean Body Mass
Calculate your lean body mass and fat mass from your weight and body fat percentage.
Calculate →WHtR
Calculate your waist-to-height ratio (WHtR) — a simple and reliable indicator of central adiposity and cardiometabolic risk.
Calculate →Target Heart Rate
Calculate your target heart rate zone and maximum heart rate for any exercise intensity.
Calculate →Pace
Calculate your running or walking pace per kilometre and per mile from a distance and time.
Calculate →Running Speed
Calculate your average running or walking speed in km/h and mph from distance and time.
Calculate →1RM Calculator
Estimate your one-rep max (1RM) for any lift from a weight and rep count.
Calculate →Body Surface Area
Calculate your body surface area (BSA) using the Mosteller formula.
Calculate →Ideal Body Fat
Find the recommended body fat percentage range for your sex and fitness category.
Calculate →Running Cadence
Calculate your running cadence (steps per minute) and see how it compares to the optimal range.
Calculate →Pace Per Mile
Calculate your pace per mile and per kilometre from a distance in miles and total time.
Calculate →Walking Calories
Estimate calories burned walking based on your weight, distance, and pace.
Calculate →Pace Per KM
Calculate your running or walking pace per kilometre from distance and time.
Calculate →Mile Time
Calculate your mile time from a known pace or convert between pace and speed.
Calculate →HR Zones
Calculate all five heart rate training zones from your age and resting heart rate.
Calculate →Cycling Calories
Estimate calories burned cycling based on your weight, distance, and speed.
Calculate →Water Intake (oz)
Calculate your recommended daily water intake in fluid ounces based on weight and activity level.
Calculate →Sleep
Find the best bedtime or wake time based on 90-minute sleep cycles.
Calculate →Sleep Cycle Calculator
Calculate how many complete 90-minute sleep cycles fit into your available sleep time.
Calculate →Wake-Up Time Calculator
Find the best wake-up times based on your bedtime and 90-minute sleep cycles.
Calculate →Bedtime Calculator
Find the ideal bedtime to wake up refreshed at your target wake-up time.
Calculate →Hydration Reminder Calculator
Calculate how often you should drink water throughout the day to meet your daily hydration goal.
Calculate →Daily Water Intake by Body Weight Calculator
Calculate your recommended daily water intake based on your body weight and activity level.
Calculate →Calories Burned Running Calculator — By Distance & Pace
Enter your distance, weight, and pace to see exactly how many calories you burned running. Free instant results.
Calculate →Target Weight Loss Calculator
Calculate how long it will take to reach your target weight based on your daily calorie deficit.
Calculate →VO2 Max
Estimate your VO2 max from your resting heart rate.
Calculate →Swimming Calories
Estimate calories burned during a swimming session.
Calculate →Steps to Calories
Convert your daily step count to calories burned.
Calculate →Steps to Miles
Convert your step count to miles walked.
Calculate →Sleep Debt
Calculate how much sleep debt you've accumulated.
Calculate →Push-Up Calories
Estimate calories burned doing push-ups.
Calculate →BMI Prime
Calculate your BMI Prime — a normalized BMI ratio.
Calculate →Pregnancy Weeks
Find out how many weeks pregnant you are and when your baby is due.
Calculate →BAC Calculator
Estimate your blood alcohol content (BAC) using the Widmark formula.
Calculate →Ovulation Calculator
Estimate your ovulation date, fertile window, and days until next ovulation.
Calculate →Army Body Fat
Calculate body fat percentage using the official US Army circumference method.
Calculate →Caffeine Calculator
Calculate your total caffeine intake and see how it compares to safe daily limits.
Calculate →Due Date
Calculate your estimated due date, weeks pregnant, trimester, and days remaining.
Calculate →Steps to km
Convert steps to kilometers (and miles) based on your height, and estimate calories burned.
Calculate →Water Intake
Calculate how much water you should drink per day based on your weight, activity level, and climate.
Calculate →TDEE by Goal
Calculate your Total Daily Energy Expenditure and target calories for weight loss, maintenance, or muscle gain.
Calculate →BMI by Age
Calculate your BMI with age-adjusted interpretation — because healthy weight ranges shift slightly as you get older.
Calculate →Period Due Date
Calculate your next period date, ovulation window, and days until your next period.
Calculate →Ovulation Window
Find your fertile window, peak ovulation day, and next period date from your last period start date.
Calculate →Luteal Phase
Calculate your luteal phase length and find out if it falls within the normal range of 11–17 days.
Calculate →Perimenopause Age
Estimate your likelihood of perimenopause based on age, family history, and recent cycle changes.
Calculate →PMS Severity
Rate 10 common PMS symptoms to get a total severity score and find out if your symptoms may be in the PMDD range.
Calculate →