What is a healthy body fat percentage?

There's no single official cutoff, but most adult men do well at roughly 14–24% body fat and most adult women at roughly 21–31%. Those are the “fitness” and “average” bands on the American Council on Exercise (ACE) chart. On that chart, obesity starts at 25% for men and 32% for women. Research that mapped body fat onto BMI cutoffs gives similar numbers. For adults aged 20–39 it found healthy ranges of about 8–20% for men and 21–33% for women, shifting a few points higher with age.

Below you'll find both reference charts with their sources, how the main measuring methods compare, the U.S. Navy tape formula our body fat calculator uses, and three worked examples. One of them shows why two men with the same BMI can have very different body fat.

Body fat ranges for men and women

A widely quoted chart comes from ACE, a US fitness certification organization. Its categories describe typical populations, such as athletes and average non-athletes. They aren't medical thresholds.

Essential fat is the minimum the body needs to work normally. ACE puts it higher for women than for men, and every women's category on the chart sits about 7–8 points above the matching men's category.

Ranges by age: the Gallagher study

The ACE chart ignores age. A frequently cited study by Dympna Gallagher and colleagues, published in the American Journal of Clinical Nutrition in 2000, measured body fat in 1,626 adults. It then worked out which body fat levels match the standard BMI cutoffs for underweight (18.5), overweight (25) and obesity (30).

For adults aged 20–39, a healthy BMI matched about 21–33% body fat in women and about 8–20% in men. The ranges move a few percentage points higher in the 40–59 and 60–79 age groups. They also differ between the African American, Asian and white groups the authors studied. The authors called the ranges provisional. Treat them as a reference point, not a diagnosis.

How body fat is measured

Every method estimates body fat. None of them weighs your fat directly. The practical question is which method you can repeat under the same conditions.

How big can tape-measure errors be? Studies of US service members have compared military tape equations with DXA. They found average errors of a few percentage points, in either direction depending on the group and equation. In one study of recruits, the tape underestimated body fat by about 6 points on average before basic training. Tape equations do well at sorting people into broad categories. They're less exact for one person's precise number.

The U.S. Navy tape formula

Our calculator uses the equations published by Hodgdon and Beckett at the Naval Health Research Center in 1984. With all measurements in inches:

Men: % body fat = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76 Women: % body fat = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387

Measure with a flexible tape, snug but not compressing the skin. Men measure the waist at the navel. Women measure the waist at its narrowest point and the hips at the widest point of the buttocks. Measure the neck just below the Adam's apple. Take each measurement two or three times and average them.

Small errors matter. In Example 1 below, measuring the waist half an inch too big raises the result by about 0.9 points.

Worked examples

Example 1: man, 5 ft 10 in, 190 lb, neck 15.5 in, waist 36 in

waist − neck = 36 − 15.5 = 20.5 86.010 × log10(20.5) = 86.010 × 1.31175 = 112.824 70.041 × log10(70) = 70.041 × 1.84510 = 129.233 Body fat = 112.824 − 129.233 + 36.76 = 20.35% → about 20.4% Fat mass = 190 × 0.2035 ≈ 38.7 lb Lean mass = 190 − 38.7 ≈ 151.3 lb

On the ACE chart that's “average” (18–24%). For a man in his 20s or 30s, it's right at the upper edge of the Gallagher range. His BMI is 27.3, which the CDC classes as overweight. His 36-inch waist is under the 40-inch level that the NHLBI links to higher risk for men.

Example 2: same height and weight, neck 16.5 in, waist 32 in

waist − neck = 32 − 16.5 = 15.5 86.010 × log10(15.5) = 86.010 × 1.19033 = 102.380 Body fat = 102.380 − 129.233 + 36.76 = 9.91% → about 9.9% Fat mass = 190 × 0.0991 ≈ 18.8 lb Lean mass = 190 − 18.8 ≈ 171.2 lb

Same BMI of 27.3, but this man is in the ACE athletic range (6–13%). His extra weight is mostly lean mass. This is the classic limitation the CDC describes: BMI doesn't measure body fat directly and can't tell fat from muscle.

Example 3: woman, 5 ft 5 in, 145 lb, neck 13 in, waist 30 in, hips 39 in

waist + hip − neck = 30 + 39 − 13 = 56 163.205 × log10(56) = 163.205 × 1.74819 = 285.313 97.684 × log10(65) = 97.684 × 1.81291 = 177.093 Body fat = 285.313 − 177.093 − 78.387 = 29.83% → about 29.8% Fat mass = 145 × 0.2983 ≈ 43.3 lb Lean mass = 145 − 43.3 ≈ 101.7 lb

That's within the ACE “average” band (25–31%) and inside the roughly 21–33% Gallagher range for women aged 20–39. Her BMI is 24.1, in the healthy range, and her waist is under the 35-inch level the NHLBI uses for women. All three measures agree. If they didn't, the disagreement itself would be worth discussing with a doctor.

Body fat vs BMI: use them together

BMI is only weight relative to height. The CDC calls it a screening tool. It doesn't measure body fat and can't diagnose health problems. It's still useful because it's quick, free and consistent, and our BMI calculator and ideal weight calculator use the standard adult categories. Each measure adds something different:

• BMI screens for weight relative to height and is the starting point in most clinics.
• Waist circumference reflects fat around the middle. The NHLBI says a waist above 40 inches for men or 35 inches for women raises the risk of heart disease and type 2 diabetes.
• Body fat percentage separates fat from lean mass. That's why it can explain a “high” BMI in a muscular person, or flag high body fat at a normal weight.

Tracking changes over time

Keep one method and repeat it under the same conditions: same time of day, same tape or scale, same person measuring. Monthly checks are plenty. ACE notes there's no official guideline for how fast to lose body fat. It suggests about 1 percentage point a month as a pace most experts consider safe and realistic.

If you're losing fat, pair the measurements with a sensible eating plan. Our guide to calculating a calorie deficit and the calorie calculator walk through that.

Limitations

These ranges and formulas are for adults. They don't apply to children and teens, who are assessed with BMI-for-age growth charts, or during pregnancy. Body fat varies with age, sex and ancestry, and all field methods carry measurement error. A number just over a category line isn't meaningfully different from one just under it. If a result worries you, or your measurements change quickly without explanation, talk to your doctor.