Calories · BMI · Macros · Fitness
Health calculators
Know your body's numbers. 33 free calculators.
Most popular
BMI Calculator
Calculate your body mass index and healthy weight range.
Calorie Calculator
Find out how many calories you should eat each day.
TDEE Calculator
Find your total daily energy expenditure — the calories you burn each day.
Pregnancy Due Date Calculator
Estimate your baby's due date and how far along you are from your last period.
All health calculators
A1C Calculator
Convert an A1C percentage to estimated average blood glucose (eAG) in mg/dL and mmol/L.
Blood Alcohol (BAC) Calculator
Estimate blood alcohol concentration from drinks, weight and time.
BMR Calculator
Estimate your basal metabolic rate — the calories your body burns at rest.
Body Fat Calculator
Estimate body fat percentage with the US Navy tape-measure method.
Body Fat Calculator (US Navy)
Estimate your body fat percentage with the US Navy tape-measure method.
Body Surface Area Calculator
Calculate body surface area (BSA) with the Mosteller formula.
Calcium Calculator
Estimate your daily calcium from food and supplements and compare it with the NIH recommended amount and upper limit for your age and sex.
Calories Burned Calculator
Estimate calories burned during exercise and everyday activities.
Fiber Intake Calculator
Estimate a dietary fiber reference from daily calories and compare it with the fiber you currently eat.
Heart Rate Zone Calculator
Find your estimated max heart rate and training zones for fat burning and cardio.
Ideal Weight Calculator
See ideal body weight ranges from four common formulas and a healthy BMI range.
Macro Calculator
Split your daily calories into protein, carbs and fat grams.
One Rep Max Calculator
Estimate your one-rep max from a weight you can lift for several reps.
Ovulation Calculator
Estimate your ovulation day and most fertile window from your cycle.
Period & Cycle Calculator
Estimate your next period, fertile window and ovulation day from your cycle length.
Plate Loading Calculator
Find the plates needed on each side of a barbell for your planned lifting weight, in pounds or kilograms.
Pregnancy Weight Gain Calculator
See the recommended pregnancy weight gain range based on your pre-pregnancy BMI.
Protein Calculator
Estimate adult daily protein ranges using body weight and energy needs, with optional US or metric measurements.
Protein Per Meal Calculator
Split your existing daily protein target across meals and snacks, including a protein amount already planned.
Race Time Predictor
Predict your finish time for a longer race based on a race you've already run.
Running Pace Calculator
Find your running pace per mile and per kilometer from distance and time.
Sleep Calculator
Find the best times to go to bed so you wake up between sleep cycles.
Steps to Calories Calculator
Estimate how many calories you burn from your daily step count.
Steps to Miles Calculator
Convert your step count to miles and kilometers walked.
Training Volume Calculator
Calculate weight × reps × sets and weekly volume for one exercise, so you can compare consistent workouts.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and see the associated health-risk category.
Water Intake Calculator
Estimate how much water to drink each day.
Weekly Activity Calculator
Combine moderate and vigorous exercise minutes and check your week against general adult activity guidelines.
Weight Loss Calculator
See how long a weight goal takes at a safe daily calorie deficit.