Body Fat Calculator
? Frequently Asked Questions
What methods does the Body Fat Calculator use?
Common methods include U.S. Navy formula (using waist, neck, hip measurements), BMI-based estimation, and skinfold measurements. Each has different accuracy levels, with Navy formula being widely used and reasonably accurate.
How accurate are body fat calculations?
Calculator estimates are within 3-4% of true body fat. They're less accurate than DEXA scans or hydrostatic weighing but much more convenient. Results vary based on body type and measurement accuracy.
What measurements do I need?
The U.S. Navy method requires: height, waist circumference (at naval), and neck circumference for men. Women also need hip measurement. Take measurements at the same time of day for consistency.
What's a healthy body fat percentage?
For men: 6-24% is normal (athletes 6-13%, fitness 14-17%, average 18-24%). For women: 14-31% is normal (athletes 14-20%, fitness 21-24%, average 25-31%). Essential fat minimums are 2-5% for men, 10-13% for women.
Is body fat percentage better than BMI?
Yes, body fat percentage is more meaningful than BMI because it distinguishes between muscle and fat. An athlete may have high BMI but low body fat, while someone with low muscle may have normal BMI but high body fat.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.