Body composition calculators
10 free calculators · instant · nothing you enter is uploaded
Body composition describes what your weight is actually made of — muscle, fat, bone and water — and it explains why two people of the same height and weight can look and feel completely different. The calculators in this group estimate proportions from measurements you can take at home: a tape measure, a scale, a height. They are population formulas rather than laboratory measurements, so treat any single number as a rough position on a range, and watch the trend over weeks rather than the reading on any one day.
BMI Calculator
Body Mass Index with healthy weight range.
Body Fat Calculator (Tape Method)
Estimate body fat % from a tape measure.
Body Fat from BMI (Deurenberg)
Estimate body fat from BMI and age.
Ideal Weight Calculator
Four classic formulas plus a healthy range.
Lean Body Mass Calculator
Lean mass and fat mass from weight and body fat.
Waist-to-Hip Ratio Calculator
WHR and your risk category.
Waist-to-Height Ratio Calculator
A better predictor than BMI for many.
Body Surface Area Calculator
BSA by Du Bois, Mosteller and Haycock.
FFMI Calculator (Fat-Free Mass Index)
Muscle mass relative to height, height-normalised.
Blood Pressure Category Calculator
Classify a reading and get your MAP.