Question 1

How accurate is this body fat calculator?

Accepted Answer

The U.S. Navy circumference method is typically within about 3–4 percentage points of a DEXA scan for most adults. It's most useful for tracking change on the same body over time; for one-off precision, a DEXA or hydrostatic test is the gold standard. The tape can read high for very muscular builds.

Question 2

What is a healthy body fat percentage?

Accepted Answer

Using American Council on Exercise bands, the fitness range is roughly 14–17% for men and 21–24% for women, and the average range is about 18–24% (men) and 25–31% (women). Women need more essential fat than men (about 10–13% vs 2–5%) for normal hormone function, so a 'healthy' number is sex-specific.

Question 3

Is the U.S. Navy body fat method reliable?

Accepted Answer

It's reliable enough that the U.S. Department of Defense uses it for fitness screening. It only needs a tape measure and your height, and it's repeatable at home. Its main limitation is that it estimates fat from circumference, so unusually muscular or unusually slim builds can skew it — which is why we also show a BMI-based estimate for comparison.

Question 4

Why is my body fat different from my BMI?

Accepted Answer

BMI is only weight and height, so it can't separate muscle from fat — a muscular person can have a high BMI but low body fat. Body fat percentage measures composition directly (here, from tape measurements), which is why the two numbers can disagree. The Navy estimate is usually the better read of the two.

Question 5

Where do I measure my neck, waist, and hips?

Accepted Answer

Neck: just below the larynx (Adam's apple), with the tape sloping slightly downward to the front. Waist: at the navel for men, at the narrowest point for women. Hips (women only): around the widest part of the buttocks. Keep the tape level and snug, measure on bare skin, and average two readings.

Question 6

Can I lower my body fat percentage?

Accepted Answer

Yes — a modest, sustained calorie deficit paired with enough protein and resistance activity lowers fat while protecting lean mass. You can estimate a sensible deficit on our calorie-deficit calculator and turn your numbers into a balanced plate with the MyPlate Plan calculator.

Question 7

Do I need calipers or a DEXA scan?

Accepted Answer

Not for an everyday estimate. Skinfold calipers and DEXA are more precise but need equipment or a clinic visit. The tape-measure method here is free, private, and — measured consistently — perfectly good for watching the trend over weeks and months.

Free Body Fat Calculator — U.S. Navy Method + Body Fat Percentage (2026)