Health & Fitness Calculators
BMI, calorie, macro, and pace calculators for everyday health and fitness questions — not medical advice, just the math.
- BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight instantly. Free, instant, private.
- TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and calorie needs based on activity level. Free, instant.
- Macro Calculator
Calculate protein, carb, and fat grams from a daily calorie target and macro ratio. Free, instant.
- Pace Converter
Convert running distance and time into pace per mile/km and speed. Free, instant.
- Water Intake
Calculate recommended daily water intake based on body weight and exercise. Free, instant.
- 1RM Calculator
Estimate your one-rep max (1RM) from a weight and rep count, plus a training percentage table. Free, instant.
- Due Date Calculator
Estimate a pregnancy due date and current week from the last menstrual period. Free, instant, private.
- Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method. Free, instant.
- Calorie Burn Calculator
Estimate calories burned during an activity using MET values. Free, instant.
- Heart Rate Zones
Calculate your training heart rate zones from age. Free, instant.
- Ideal Weight Calculator
Estimate ideal body weight from height using the Devine formula. Free, instant.
- Steps to Calories
Estimate distance walked and calories burned from step count. Free, instant.
- Sleep Cycle Calculator
Calculate optimal bedtimes or wake times based on 90-minute sleep cycles. Free, instant.
- Waist-to-Hip Ratio
Calculate waist-to-hip ratio and compare to WHO reference ranges. Free, instant.
- BAC Estimator
Estimate blood alcohol content using the Widmark formula. Free, instant, educational only.
- Caffeine Half-Life
Estimate remaining caffeine in your system based on half-life. Free, instant.
- VO2 Max Estimator
Estimate VO2 max from a 12-minute Cooper run test distance. Free, instant.
- Protein Intake
Calculate daily protein target from body weight and activity level. Free, instant.
- Race Time Predictor
Predict a race time at one distance from a known time at another, using Riegel's formula. Free, instant.
- Sweat Rate Calculator
Calculate your sweat rate from pre/post-exercise weight and fluid intake. Free, instant.
- BMR Calculator
Calculate basal metabolic rate using the Mifflin-St Jeor equation. Free, instant.
- Blood Pressure Checker
Check a blood pressure reading against the American Heart Association's categories. Free, instant.
- RHR Fitness Level
Check your resting heart rate against a general adult fitness level scale. Free, instant.
- Calories to Steps
Calculate how many steps you'd need to walk to burn a calorie target. Free, instant.
- Pregnancy Weight Gain
Look up the recommended total pregnancy weight gain range by pre-pregnancy BMI. Free, instant.
- Alcohol Units
Calculate standard alcohol units and grams of pure alcohol from drink volume and ABV. Free, instant.
- Recovery HR Checker
Check your 1-minute post-exercise heart rate recovery against a healthy benchmark. Free, instant.
- Training Load
Calculate session training load using the session-RPE method. Free, instant.
- Lean Body Mass
Calculate lean body mass from weight and height using the Boer formula. Free, instant.
- Daily Fiber Intake
Calculate a recommended daily fiber target based on calorie intake. Free, instant.