Body Fat Calculator
Calculate body fat percentage
Frequently Asked Questions
How does the Body Fat Calculator estimate body fat percentage?
The calculator uses the U.S. Navy method, which estimates body fat from neck, waist, and hip circumference measurements along with height. For men: %BF = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76.
What is a healthy body fat percentage?
Healthy ranges vary by gender and age. For men: 10-20% is considered fit, 20-25% acceptable. For women: 18-28% is fit, 25-31% acceptable. Essential fat minimums are 2-5% for men and 10-13% for women.
How accurate is the Navy method for body fat estimation?
The Navy method is accurate within ±3-4% for most people. It is less accurate for very muscular individuals or those with unusual body proportions. For clinical precision, DEXA scans or hydrostatic weighing are recommended.
How do I measure my waist and neck circumference correctly?
Measure your waist at the navel level (widest point for men). Measure your neck just below the larynx (Adam's apple), sloping slightly downward at the front. Use a flexible tape measure and keep it snug but not tight.
Why is body fat percentage more useful than BMI?
Body fat percentage directly measures fat versus lean mass, while BMI only considers total weight relative to height. A muscular person may have a high BMI but low body fat. Body fat percentage gives a more accurate picture of body composition and health risk.