26 calculators
Free health and fitness calculator hub: BMI, BMR, TDEE, body fat, ideal weight, lean body mass and daily water in one place, plus links to every health tool.
Free BMI calculator for men and women: get your Body Mass Index, WHO health category and healthy weight range instantly in metric or imperial units.
Free body fat calculator using the US Navy method: estimate your body fat percentage for men and women from simple circumference measurements.
Free ideal weight calculator: find your healthy body weight range from height and gender with the Devine, Robinson and Miller formulas.
Free lean body mass calculator estimates lean mass and body fat percentage from height and weight using the Boer and James formulas for men and women.
Free body shape calculator: find your body type (hourglass, pear, apple, rectangle or inverted triangle) from bust, waist and hip measurements.
Free BMR calculator using the Mifflin-St Jeor equation: get your basal metabolic rate and daily calorie needs from weight, height and age.
Free TDEE calculator: estimate your total daily energy expenditure and maintenance calories from BMR and activity level for weight goals.
Free calorie deficit calculator shows how many calories to eat each day to lose weight at your chosen pace, based on your TDEE and a safe weekly deficit.
Free calories burned calculator: estimate how many calories you burn walking, running, cycling, swimming and 15+ activities. Uses 2024 Compendium MET values.
Free macro calculator: daily calories plus protein, carb and fat grams for weight loss, muscle gain or maintenance. Enter your age, sex, height and weight.
Free protein calculator: daily protein needs in grams from body weight and activity, from the 0.8 g/kg RDA to 2.0 g/kg for athletes and muscle gain.
Free keto calculator: enter your body stats, activity level and goal to get a calorie target plus daily net-carb, protein and fat grams for standard keto.
Free water intake calculator tells you how much water to drink per day based on body weight and exercise, following the 30-35 ml per kg guideline.
Free VO2 max calculator estimates cardiorespiratory fitness from a 12-minute run or resting heart rate, with age- and sex-based fitness categories.
Free running pace calculator converts time and distance into pace per kilometer or mile, speed, and predicted 5K, 10K, half and full marathon times.
Free heart rate zone calculator finds your five training zones from age and resting heart rate using the Karvonen formula for fat burn and cardio.
Free sleep calculator: get bedtimes from your wake-up time or wake-up times from your bedtime, using 90-minute sleep cycles and 7-9 hour age recommendations.
Free due date calculator using Naegele's Rule: estimate your baby's arrival date from your last period or conception date, week by week.
Free blood type calculator: predict your baby's blood type from the parents' ABO types with probability percentages and Rh risk.
Free blood compatibility checker: see who you can donate to and receive from by ABO and Rh type, with universal donor status.
Free dog age calculator converts dog years to human years using the DNA methylation formula and size-based AVMA estimates, with puppy-to-senior life stages.
Free cat age calculator converts cat years into human years and identifies your cat life stage from kitten to senior using veterinary guidelines.
Free VO2 max estimate from running pace.
Free cycling VO2 max calculator that estimates aerobic capacity in mL/kg/min from your best five-minute power and body weight using the ACSM cycling equation.
Free kids BMI calculator: get your child's Body Mass Index and CDC age-and-sex percentile with healthy weight range