CalorieHawk

Body Fat Calculator

Calculate body fat percentage using tape measurements.

Tape method
Body fat categories
Fat vs lean mass
Body fat estimate
Tape measurements based on common circumference formulas.
years
Body fat (Navy)
25.3%
Body fat (BMI)
28.4%
Category
Average
Body fat categories2% to 45%
25.3%
2%14%21%25%32%45%
Essential
2%-14%
Athletes
14%-21%
Fitness
21%-25%
Average
25%-32%
Obese
32%+
Fat mass
17.2kg
Lean mass
50.8kg
Fat to ideal
4.4kg
Body composition68.0 kg
Lean mass
50.8 kg
Fat mass
17.2 kg
Ideal body fat (age-based)18.9%

Circumference method

Tape measurements provide a practical estimate of body fat using proven formulas. Accuracy improves with consistent measuring technique.

Assumptions

This estimate uses the U.S. Navy circumference formula and assumes accurate tape placement. For valid results, height and neck must be greater than zero, and waist must exceed neck (men) or waist + hip must exceed neck (women).

Tracking progress

Use the same tape, time of day, and measurement points to track changes over time.

FAQ

How accurate is this body fat calculator?

This body fat calculator is an estimate based on circumference measurements. It is usually more useful for tracking trends over time than for matching a lab-grade body fat test exactly.

Which formula does this body fat calculator use?

It uses the U.S. Navy circumference method. That formula estimates body fat percentage from height plus neck and waist measurements, with hip measurements included for women.

Is body fat percentage more useful than BMI?

Body fat percentage usually gives more context than BMI because it better reflects how much of your weight is fat versus lean tissue. BMI is still useful as a quick screening metric.