Body metrics calculator.
BMI, a healthy weight range, body fat, lean mass and FFMI from a few measurements. The same formulas as Body metrics in Ritual Lab.
Free calculator
Estimates for general guidance, not medical advice. See the medical disclaimer and sources.
How it works
The formula.
BMI is weight ÷ height². The healthy range uses a BMI of 21 to 25 for men and 20 to 24 for women. Body fat uses the U.S. Navy formula from waist, neck and height, and FFMI is lean mass ÷ height², adjusted to a 1.8 m height.
Questions
Frequently asked
What does the body metrics calculator work out?
BMI, a healthy weight range for your height, waist-to-height ratio, and, with a waist and neck measurement or your own body fat figure, fat mass, lean mass and FFMI.
How is body fat estimated?
With the U.S. Navy method, from your height, waist and neck. If you already know your body fat percentage, enter it and that is used instead.
Is Body metrics free in Ritual?
Yes. Body metrics is one of three calculators that are always free in Ritual, with One-rep max and BOLT score.
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