Our calculator uses the US Navy method which is clinically validated and provides accuracy within 3-4% when measurements are taken correctly. For the most accurate results, have someone else take your measurements.

You'll need your height, neck circumference, and waist circumference. For women, hip circumference is also required. Measure in the morning before eating for most consistent results.

For most people, measuring every 4-8 weeks is sufficient to track changes without becoming obsessive about daily fluctuations. Always measure under similar conditions (time of day, hydration level).

For men, 10-20% is considered healthy. For women, 18-28% is typically healthy. These ranges vary slightly by age. Athletes may have lower percentages while older adults may have slightly higher healthy ranges.