Body & Fitness Calculators
Our body composition and fitness calculators help you understand your physical health. From BMI and body fat percentage to ideal weight and lean body mass, these evidence-based tools provide accurate assessments to guide your fitness journey.
BMI Calculator
Check your Body Mass Index and weight category
PopularBody Fat Calculator
Estimate body fat percentage using Navy method
PopularIdeal Weight
Find your healthy weight range based on height
Lean Body Mass
Calculate your lean muscle mass
NewWaist-to-Height Ratio
Assess health risk based on waist measurement
NewWaist-to-Hip Ratio
Evaluate body fat distribution risk
NewWeight Loss Planner
Plan your safe weight loss journey
NewWeight Gain Planner
Plan healthy weight gain with surplus calories
NewFitness Age
Discover your body's fitness age
NewAge Calculator
Calculate your exact age in years, months, days
FFMI Calculator
Fat-Free Mass Index — assess muscle mass
NewBody Roundness Index
BRI — a newer body shape health metric
NewBSA Calculator
Body Surface Area using Mosteller formula
New1 RM (One Rep Max)
Calculate your one-rep max strength
NewPush-up Test
Rate your upper body strength
NewSkinfold Body Fat (Durnin & Womersley)
4-site skinfold body fat measurement
NewSkinfold Body Fat (YMCA)
3-site YMCA skinfold body fat measurement
NewSkinfold Body Fat (Children)
Skinfold body fat for ages 6-17
NewWaist Circumference Assessment
Assess health risk by waist measurement
NewUnit Converter
Convert between metric and imperial units
NewInterval Timer
Work/rest timer for interval training
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