Toolgeist › Productivity

Body Fat Percentage Calculator — US Navy Method

Estimate body fat percentage using the US Navy circumference method — neck, waist and (for women) hip measurements plugged into a validated formula — a reasonably accurate estimate with just a tape measure, when calipers or a DEXA scan are not available.

How to use Body Fat Calc

1. Measure neck, waist, and hip (if applicable) circumference.
2. Enter height and the measurements.
3. Read the estimated body fat percentage.

Frequently asked questions

How accurate is the US Navy method compared to a DEXA scan?

It is a reasonable estimate for most body types, typically within a few percentage points of DEXA, though it can be less accurate for very lean or very high body-fat individuals.

Why does the formula need a neck measurement?

The Navy method uses the ratio between waist (or waist+hip) and neck circumference as a proxy correlated with body fat percentage, rather than requiring specialized equipment.

Where exactly should I measure my waist?

At the narrowest point for men, typically at the navel level for the standard Navy method protocol — consistent measurement location matters for tracking change over time.

Related Productivity tools

• Team Generator
• Running Pace
• YT Timestamp
• Week Number
• Random Date
• Health Suite

Also searched for: body fat percentage calculator navy method · estimate body fat with tape measure · body fat calculator no calipers

Browse all 738 free tools on Toolgeist →