body composition

Body Fat Calculator

Estimate body fat percentage with Navy circumference or Jackson-Pollock 3-site skinfold inputs, then calculate lean mass and FFMI.

Body composition

Trend tracking

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SexHeight (cm)Weight (kg)MethodNeck (cm)Waist (cm)

Body fat

15.3%

Navy circumference estimate

Lean mass

69.5kg

153.1 lb

FFMI

21.4

Raw FFMI 21.4

Estimate body fat percentage with Navy circumference or Jackson-Pollock 3-site skinfold inputs, then calculate lean mass and FFMI.

Body composition

Trend tracking

No signup, no ads

How the body composition estimate works

Circumference and FFMI formulas are useful for trend tracking, not diagnosis. Use the same measurement method each time and watch the direction across weeks.

Related calculators

Training guides

FFMI Calculator

Calculate fat-free mass index, lean mass, and height-normalized FFMI from bodyweight, height, and body fat percentage inputs.

Questions lifters ask

How should I use the Body Fat Calculator? +

Use the output as a starting estimate, track actual bodyweight and performance for two weeks, then adjust based on trend data.

Is this medical advice? +

No. These calculators are for general training planning. Work with a qualified professional if you have medical conditions or disordered eating history.