Health
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Enter a few measurements for a quick result.
Guide
How to use the Body Fat Calculator
The Body Fat Calculator helps you make a quick estimate, compare scenarios, and understand the numbers behind the result. It is designed for fast planning, with enough context to make the answer useful instead of just a number.
- Enter current measurements as accurately as possible, using the unit system that fits you best.
- Compare the result with the displayed ranges or targets to understand the estimate in context.
- Adjust assumptions such as activity level, sex, age, or goal where the calculator supports them.
Method
How this calculator works
It uses circumference-based U.S. Navy style equations to estimate body fat percentage.
This calculator is useful for tracking directional body composition changes without specialized equipment.
Because assumptions matter, try a few values that represent optimistic, typical, and conservative cases.
Health calculators are screening and planning tools, not medical advice. They cannot replace a clinician's evaluation.
Example
Worked example
A man 5'11" (180 cm) with a 90 cm waist and 38 cm neck: the Navy formula gives about 20% body fat — in the average range. If three months of training brings the waist to 86 cm with the same neck, the estimate drops to about 17.5%, which is the kind of change this method tracks reliably.
FAQ
Common questions
What is a healthy body fat percentage?
Typical healthy ranges are roughly 10%–20% for men and 18%–28% for women, with athletes often lower. Essential fat — the minimum for normal function — is around 3% for men and 12% for women; going near those levels is not a casual goal.
How accurate is the Navy body fat method?
Compared to lab methods like DEXA scans, the Navy circumference formula is typically within about 3–4 percentage points. Its real strength is consistency: measured the same way each time, it tracks changes in body composition well without any equipment beyond a tape measure.
When should I take the measurements?
Morning, before eating, tape snug but not compressing the skin. Waist is measured at the navel for men and at the narrowest point for women; consistency in technique matters more than perfection.
What information do I need for the Body Fat?
You usually need sex, height, neck, waist, and hip measurements where applicable. You can change the inputs and recalculate as many times as needed.
How does the Body Fat calculate the result?
It uses circumference-based U.S. Navy style equations to estimate body fat percentage.
Are the results exact?
Health calculators are screening and planning tools, not medical advice. They cannot replace a clinician's evaluation.
Related
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Sources