Body Fat Calculator
Estimate body fat with the U.S. Navy method.
Body fat
16.9%
Category: Fitness
Introduction
The U.S. Navy tape-measure method is a decent field estimate — cheap, no calipers, ±3–4% of DEXA in most people.
What is Body Fat Calculator?
Body-fat estimates can be useful for following a personal trend, but tape-measure methods are sensitive to measurement technique and do not replace a clinical assessment.
Definition: Body Fat Calculator estimates body-fat percentage from the measurements requested by the selected method.
Formula
Body fat % ≈ U.S. Navy circumference method from neck, waist, and hip measurements
Calculation steps
Method. U.S. Navy circumference formula using log10 of neck, waist and (for women) hip in cm, plus height. Take measurements with a soft tape, at end-normal exhale, unclothed at the site.
Accuracy. Compared to DEXA the method has an average error of ±3–4%. It over-estimates for very lean people and under-estimates for very heavy ones.
Worked example
Example: Using the Body Fat Calculator
Inputs: Enter values relevant to body composition — for example, the measurements or amounts described in the tool fields above.
- Open the Body Fat Calculator and review the input fields.
- Apply the formula: Body fat % ≈ U.S. Navy circumference method from neck, waist, and hip measurements
- Adjust inputs to compare scenarios side by side.
You receive an immediate estimate body fat with the u.s. navy method — useful for planning and comparison.
Use cases
- Recording consistent waist, neck, hip, height, and weight measurements over time
- Comparing a trend using the same method and measurement conditions
- Discussing broader health goals with a qualified professional
Advantages
- Browser-based processing — entered values and selected files are not sent to our servers
- No account required
- Instant results with a clean, readable interface
- Transparent formula shown on this page
Limitations
- A small change in tape placement can change the estimate.
- The result is an estimate, not a direct body-composition measurement.
- Pregnancy, medical conditions, and unusual body composition may require professional guidance.
Frequently asked questions
- Is the Body Fat Calculator free to use?
- Yes. Body Fat Calculator on The Daily Tools is completely free, requires no account, and runs entirely in your browser.
- Does The Daily Tools store my inputs?
- No. Your numbers and text never leave your device. The Daily Tools has no backend database for calculator inputs.
- Who should use the Body Fat Calculator?
- Anyone who needs a clear health and fitness calculation and wants to check the assumptions used.
- How accurate is the Body Fat Calculator?
- Results follow the standard formula shown on this page. They are estimates for planning — not a substitute for professional medical advice.
- Can I use the Body Fat Calculator on mobile?
- Yes. The Daily Tools is fully responsive and works on phones, tablets, and desktops.
Sources & references
Key points
- Body Fat Calculator is a free, browser-based calculator for estimate body fat with the U.S. Navy method.
- Formula: Body fat % ≈ U.S. Navy circumference method from neck, waist, and hip measurements
- Private, browser-only processing
- Private, browser-based processing