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Body fat percentage is a more accurate health marker than BMI because it distinguishes between fat mass and lean mass (muscle, bone, water). A muscular 200 lb person and a sedentary 200 lb person can have the same BMI but wildly different health profiles. Our body fat calculator uses the US Navy method (neck, waist and hip measurements — no calipers needed) which is accurate to within 2–3 percentage points for most people.

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حول Body Fat Calculator

Body fat percentage is a more accurate health marker than BMI because it distinguishes between fat mass and lean mass (muscle, bone, water). A muscular 200 lb person and a sedentary 200 lb person can have the same BMI but wildly different health profiles. Our body fat calculator uses the US Navy method (neck, waist and hip measurements — no calipers needed) which is accurate to within 2–3 percentage points for most people.

كيفية الاستخدام

  1. Select your gender.
  2. Enter your height, and measurements for waist (at the navel), neck and — for women — hips.
  3. Read your estimated body fat percentage and fat mass vs lean mass in pounds/kg.
  4. Check the fitness category your result falls in.

الصيغة والمنهجية

US Navy Method (men): %BF = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. Women: %BF = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387.

حالات الاستخدام الشائعة

  • Tracking body composition changes during a cut or bulk
  • Setting a realistic body fat goal (e.g. 15% to see ab definition)
  • Comparing progress beyond the scale (weight might stay flat while body fat drops)
  • Determining if a BMI "overweight" result is actually muscle mass
  • Setting military or sports fitness targets

الأسئلة الشائعة

Within ±2–3% of DEXA scan results for most people. Accuracy drops for very lean athletes (sub-10% men, sub-18% women) where the formula becomes less precise.
For men: 6–24% (athlete 6–13%, fitness 14–17%, acceptable 18–24%). For women: 16–30% (athlete 16–20%, fitness 21–24%, acceptable 25–31%). Above these ranges is considered obese.
No more than once per week, under the same conditions (morning, fasted, after bathroom). Body fat estimates can vary by 1–2% day to day due to water retention.

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