Body Fat Calculator
Calculate body fat instantly with our free Body Fat Calculator. Trusted formulas, instant results, no sign-up required.
Calculate Your Body Fat
Enter your details and press Calculate to see your body fat percentage, healthy range, and daily calorie estimate.
What Your Result Means
Your calculated body fat percentage indicates the proportion of your body made up of fat tissue, as opposed to muscle, bone, and other lean tissue. Healthy ranges vary by age and biological sex — staying within your bracket's range below is generally associated with lower health risk than falling well above or below it.
Men: Healthy Body Fat Ranges
| Age Group | Healthy Range (%) |
|---|---|
| 20 – 39 years | 8% – 19% |
| 40 – 59 years | 11% – 21% |
| 60 – 79 years | 13% – 24% |
Women: Healthy Body Fat Ranges
| Age Group | Healthy Range (%) |
|---|---|
| 20 – 39 years | 21% – 32% |
| 40 – 59 years | 23% – 33% |
| 60 – 79 years | 24% – 35% |
General reference only, not medical advice. Body composition tools like this one are estimates — for precise measurement, ask a healthcare provider about DEXA or hydrostatic weighing.
How We Calculate Results
Body fat percentage is estimated using the U.S. Navy circumference method — a logarithm-based formula using neck, waist, and height measurements (plus hip measurement for women) — one of the most widely used non-clinical body-fat estimation methods.
The result is based on the inputs you provide and the assumptions described below. Learn more about how WIN Calculator develops and reviews its calculations.
Example
For example, try re-running the calculator with a slightly different weight, height, or activity level to see how sensitive your result is to small changes in your inputs.
Assumptions
- Formulas are population-level averages developed for typical adults — they don't account for individual body composition, medical conditions, medications, or pregnancy unless the calculator is specifically designed for that case.
- Inputs are taken at face value; the calculator can't verify your measurements or correct for measurement error.
Limitations
- Formulas developed for general or athletic populations may be less accurate for children, older adults, pregnant people, or people with significant muscle mass or a diagnosed medical condition.
- This is a general estimate, not a clinical measurement — lab tests, imaging, or an in-person exam from a qualified professional will always be more accurate for anything that matters medically.
Sources
- Published formulas and reference ranges from recognized health authorities — including the CDC, WHO, NIH, and peer-reviewed clinical or exercise-science literature — see the formula above for the specific source this calculator uses.
Validation
- Every formula in our calculator library is covered by an automated regression test suite that checks its output against known reference values before any code change ships.
- Formulas are written from publicly documented sources — standards bodies, government agencies, or established textbooks — rather than derived from scratch, and are reviewed again whenever the underlying guidance changes.
Health Disclaimer
This calculator is for general informational and educational purposes only. It does not diagnose, treat, or provide a clinical assessment of any health condition, and it is not a substitute for advice from a qualified healthcare provider. Always talk to a doctor or other qualified professional about your personal health.
About the Body Fat Calculator
The Body Fat Calculator is a free online tool built for everyday health and fitness tracking, so you can monitor progress without guesswork. Calculate body fat instantly with our free Body Fat Calculator. Trusted formulas, instant results, no sign-up required. It’s part of our Fitness & Health calculator collection — bmi, calories, body fat, pregnancy, and more.
Results are calculated instantly in your browser using standard, widely accepted formulas for this type of calculation, and are intended for general estimation and educational purposes rather than as a substitute for professional financial, medical, or legal advice.
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