Calculators

Free tools for measuring body fat and body composition. No signup, and nothing you enter leaves your browser.

Body Fat

• Body fat calculator: estimate your body fat percentage from a tape measure.
• Body fat percentage chart: see the normal ranges for men and women by age.

Lean Mass and Muscle

• Lean body mass calculator: find out how much of your weight is not fat.
• FFMI calculator: compare your lean mass for your height.
• Body recomposition calculator: set a goal weight, calorie target, and protein target.

Waist Measurements

• Waist to height ratio calculator: check your waist against your height.
• Waist to hip ratio calculator: see how your fat is distributed.

Military Standards

• Army waist to height ratio calculator: check the Army’s 0.55 standard.
• Navy body fat calculator: run the Navy’s current two-step assessment.