6 free calculators · No account needed
Body Composition Calculators
Look beyond one scale reading. Compare weight with height, estimate body fat from measurements, and understand how lean mass and waist size add context.
Find the right calculator
BMI Calculator
Compare adult weight with height using body mass index.
Open calculatorBody Fat Calculator
Estimate body fat from height and tape measurements.
Open calculatorIdeal Weight Calculator
Explore an adult BMI-based weight reference range.
Open calculatorLean Body Mass Calculator
Separate estimated fat mass from the rest of your weight.
Open calculatorFFMI Calculator
Compare estimated fat-free mass relative to height.
Open calculatorWaist-to-Height Ratio Calculator
Compare waist circumference with height.
Open calculatorMake sense of your results
Each measure answers a different question. BMI relates weight to height, waist-to-height ratio describes central size, and circumference equations estimate body fat. None can diagnose health or determine a personally ideal body size. Consistent measurement technique matters more than extra decimal places.
Frequently asked questions
Which measure tells me my body fat percentage?+
The body fat calculator uses a circumference equation. BMI and waist-to-height ratio do not directly calculate body fat percentage.
Can these tools measure muscle mass?+
No. Lean body mass includes water, bone, organs, and muscle. FFMI adjusts estimated fat-free mass for height; neither isolates skeletal muscle.
Do these reference ranges apply to children?+
No. Children and teens need age- and sex-specific assessment. The adult tools also need extra clinical context during pregnancy and for some medical conditions.
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