Body Fat Percentage Calculator
Estimate body fat percentage from body measurements.
A more telling number than weight
Body fat percentage — the share of your body mass that is fat — tells you more about body composition than weight or BMI alone, since it distinguishes fat from muscle, bone and water. This estimates it from body measurements using established formulas, giving a sense of composition that the scale cannot.
Enter your measurements to estimate body fat percentage.
Estimation methods and their accuracy
Measurement-based formulas estimate body fat from circumferences like the waist and neck, which is convenient but approximate — they are population estimates and can be off for an individual. More accurate methods exist, from skinfold calipers to specialised scans, each more precise and more involved. For most people the value is not the exact number but the trend over time under a consistent method, since a figure moving in the right direction is more meaningful than a single reading of uncertain accuracy. This is general information, not medical advice; body composition and healthy ranges are best discussed with a qualified professional, and the number is only one part of overall health.
Common questions
Why is body fat percentage more useful than weight?
It distinguishes fat from muscle, bone and water, so it reflects body composition in a way weight or BMI alone cannot.
How accurate is a measurement-based estimate?
It is approximate — a population estimate that can be off for an individual. The trend over time under a consistent method is more meaningful than one reading.
Is this medical advice?
No — it is general information. Healthy body composition is best discussed with a qualified professional; the number is one part of overall health.
Is my data uploaded?
No. The calculation happens in your browser.