Know your numbers
Health & Fitness
BMI, calories, body composition, pregnancy, and training metrics based on established formulas.
BMI Calculator
Check your body mass index and see where it falls on the healthy range.
Calorie Calculator
Find your daily calorie needs for maintenance, cutting, or bulking.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Pregnancy Calculator
Track pregnancy milestones week by week from your due date.
BMR Calculator
Calculate your basal metabolic rate — calories burned at rest.
Due Date Calculator
Estimate your baby's due date from your last period or conception date.
TDEE Calculator
Estimate total daily energy expenditure from BMR and activity level.
Ideal Weight Calculator
See ideal body weight ranges from four established formulas.
Ovulation Calculator
Predict your fertile window and next ovulation date.
Period Calculator
Forecast your next periods from your cycle history.
Macro Calculator
Split your daily calories into protein, carbs, and fat targets.
Protein Calculator
Find your daily protein target based on weight and training.
Carbohydrate Calculator
Estimate daily carbohydrate needs for your activity level.
Fat Intake Calculator
Calculate a healthy daily fat intake range.
Calories Burned Calculator
Estimate calories burned by activity, duration, and body weight.
Pace Calculator
Convert between pace, speed, and finish time for any race distance.
One Rep Max Calculator
Estimate your 1RM from any set using proven formulas.
Target Heart Rate Calculator
Find your training heart-rate zones by age and resting rate.
Water Intake Calculator
Estimate how much water you should drink each day.
Lean Body Mass Calculator
Estimate your lean body mass from height, weight, and sex.
Army Body Fat Calculator
Estimate body fat with the tape-test method used by the U.S. Army.
Waist-to-Hip Ratio Calculator
Assess fat distribution and health risk from two tape measurements.
Waist-to-Height Ratio Calculator
Check the simple ratio many studies prefer over BMI.
BAC Calculator
Estimate blood alcohol content from drinks, weight, and time.
Smoking Cost Calculator
See what smoking costs in money — and what quitting could earn invested.
Caffeine Calculator
Track caffeine remaining in your system through the day.
VO2 Max Calculator
Estimate aerobic fitness from the 12-minute Cooper run test.
Body Surface Area Calculator
Compute BSA with the Du Bois formula used clinically.
Calorie Deficit Calculator
Turn a calorie deficit into expected weekly and monthly weight loss.
Weight Loss Calculator
Plan a goal weight, timeline, and required daily calories.
Keto Macro Calculator
Split daily calories into standard ketogenic macros.
Intermittent Fasting Calculator
Set your eating and fasting windows for popular IF protocols.
Body Frame Size Calculator
Classify your frame from wrist circumference and height.
Steps to Miles Calculator
Convert step counts into distance from your height-based stride.
Steps to Calories Calculator
Estimate calories burned from your daily step count.
Pregnancy Weight Gain Calculator
Check recommended pregnancy weight gain for your starting BMI.
Child Height Predictor
Predict a child's adult height from the parents' heights.
Sleep Debt Calculator
Total your weekly sleep shortfall and plan recovery.
Mean Arterial Pressure Calculator
Compute MAP from systolic and diastolic readings.
Cholesterol Ratio Calculator
Evaluate the total-to-HDL ratio that predicts cardiac risk.
A1C to Blood Sugar Calculator
Convert A1C percentage to estimated average glucose.
Fiber Intake Calculator
Get your daily fiber target from calories eaten.
Sugar Intake Calculator
Find your added-sugar ceiling under WHO and AHA guidance.
Fat-Burning Zone Calculator
Find the moderate heart-rate zone that maximizes fat oxidation.