Free body fat percentage calculator using the US Navy method and BMI-based formula. Enter your measurements to get body fat %, fat mass, lean mass, and body fat category. Supports both imperial and metric units with visual category charts.
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The US Navy method is accurate to within 3-4% for most people. For more precise measurements, consider DEXA scans or hydrostatic weighing.
For men: 10-20% is fitness range, 18-25% is acceptable. For women: 18-28% is fitness range, 25-31% is acceptable. Essential fat is 2-5% for men and 10-13% for women.
Measure your waist at the narrowest point (usually at the navel). Measure your neck just below the larynx (Adam's apple). Keep the tape level and snug but not tight.
Yes, the Body Fat Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.
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Free body fat percentage calculator using the US Navy method and BMI-based formula. Enter your measurements to get body fat %, fat mass, lean mass, and body fat category. Supports both imperial and metric units with visual category charts.
NexTool's Body Fat Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.
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| Age Range | Male (Healthy) | Female (Healthy) |
|---|---|---|
| 20-29 | 7-17% | 16-24% |
| 30-39 | 12-21% | 17-25% |
| 40-49 | 14-23% | 19-28% |
| 50-59 | 16-24% | 22-31% |
| 60+ | 17-25% | 22-33% |
This calculator provides estimates based on mathematical formulas. The US Navy Method and BMI-based method are screening tools, not diagnostic measures. Accuracy varies based on individual body composition.
This is not medical advice. Body fat distribution, muscle mass, bone density, and other factors affect health outcomes beyond what these formulas can measure. For precise body fat measurement, consider methods such as DEXA scans, hydrostatic weighing, or professional calipers.
Always consult a healthcare professional before making significant changes to your diet or exercise routine.