About the Body Fat Calculator
The U.S. Navy method estimates body-fat percentage from height and a few circumference measurements. It's an at-home estimate that can be off from lab methods by several points — best for tracking your own trend over time.
How it’s calculated
A logarithmic formula on waist, neck, and height (plus hip for females), from the U.S. Navy circumference method.
Example calculation
For the default male measurements, the method estimates roughly 23% body fat.
Frequently asked questions
How accurate is the tape method?
It typically differs from lab methods like DEXA by several percentage points, and technique matters a lot. It's most useful for tracking change, not as an exact figure.
How should I measure?
Use a flexible tape, keep it level and snug but not tight, and measure at the same points each time. Consistency matters more than perfection for tracking trends.
This tool provides a general, informational estimate only. It is not medical advice and cannot diagnose, treat, or replace guidance from a qualified healthcare professional. Individual health depends on many factors this estimate does not capture. If you have questions about your health, talk to a doctor.