What Is a Healthy Body Fat Percentage? (By Age & Sex)

Your body fat percentage is one of the most meaningful numbers for understanding your health — arguably more useful than your weight on a scale or even your BMI. But what does a healthy body fat percentage actually look like? And how do you measure it? This guide covers the ranges by sex and age, explains how measurements are taken, and tells you what the number actually means for your health.

What is body fat percentage?

Body fat percentage is simply the proportion of your total body weight that is fat mass. If you weigh 170 pounds and carry 30 pounds of fat, your body fat percentage is about 17.6%. The rest of your weight — muscle, bone, organs, water, and connective tissue — makes up your lean body mass.

Not all body fat is the same. Two distinct types matter:

• Essential fat — the minimum fat required for basic physiological and hormonal function. This is around 2–5% for men and 10–13% for women. Going below these thresholds causes serious health problems including hormonal disruption and organ damage.
• Storage fat — fat accumulated beyond essential levels. Some storage fat cushions organs (visceral fat) and the rest sits beneath the skin (subcutaneous fat). Visceral fat, which wraps around internal organs, carries the highest health risks and is linked to metabolic disease, type 2 diabetes, and cardiovascular problems.

Healthy body fat percentage ranges by sex

The American Council on Exercise (ACE) publishes widely referenced body fat ranges that break down into four categories for men and women:

For women

• Essential fat: 10–13%
• Athletes: 14–20%
• Fitness: 21–24%
• Acceptable: 25–31%
• Obese: 32% and above

For men

• Essential fat: 2–5%
• Athletes: 6–13%
• Fitness: 14–17%
• Acceptable: 18–24%
• Obese: 25% and above

These ranges shift slightly with age. Body fat naturally increases and redistributes as we get older — even at the same weight — because muscle mass tends to decline with age (a process called sarcopenia). A 55-year-old woman at 27% body fat carries less health risk than a 25-year-old at the same percentage, since the older body's fat distribution pattern tends to be different and the baseline expectation changes.

How body fat percentage is measured

There are several methods for measuring body fat, ranging from clinical-grade to home-accessible. Each has tradeoffs in accuracy and convenience:

DEXA scan (dual-energy X-ray absorptiometry)

The gold standard. A DEXA scan uses low-level X-rays to differentiate between fat tissue, lean tissue, and bone. It can identify regional fat distribution (how much is visceral vs. subcutaneous), which is particularly valuable for health risk assessment. Accuracy is typically within 1–2 percentage points. The downside: it requires a clinic visit and costs $50–150 depending on your location.

Hydrostatic weighing (underwater weighing)

Once the gold standard before DEXA, this method submerges you in water and uses the difference between your dry weight and underwater weight to calculate body density, which is then converted to body fat percentage. Highly accurate but requires specialized equipment and isn't widely available to the public.

Skinfold calipers

A trained professional uses calipers to pinch fat at 3–7 specific body sites (chest, abdomen, thigh, and others). The measurements are plugged into a formula to estimate overall body fat. Accuracy depends heavily on the technician's skill. Results can vary by 3–5 percentage points between testers, making consistency difficult for tracking progress over time.

Bioelectrical impedance analysis (BIA)

This is the method used by most consumer body fat scales. A low electrical current passes through the body — fat resists the current while lean tissue conducts it — and the resistance is used to estimate fat percentage. Convenient and cheap, but highly sensitive to hydration level. Running the same measurement before and after drinking a liter of water can shift the result by 3–4 percentage points, making it unreliable for precise tracking.

The U.S. Navy tape measurement method

Developed by the U.S. Navy for fitness classification of service members, this formula estimates body fat from circumference measurements — primarily the neck, waist, and hips (for women) — without any specialized equipment. It isn't as accurate as DEXA or hydrostatic weighing, but research shows it comes reasonably close: within 3–4 percentage points for most people, which is accurate enough to identify your broad category and track meaningful changes over time.

The formula differs by sex:

• 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

All measurements are in inches. Waist is measured at the navel; hips at the widest point. This is the calculation behind the body fat calculator, which handles the math automatically once you enter your measurements.

Body fat percentage vs. BMI: which one matters more?

Body Mass Index (BMI) is calculated from weight and height alone — it has no information about whether your weight comes from fat or muscle. This creates well-known limitations. A 200-pound bodybuilder with 8% body fat and a 200-pound sedentary person with 30% body fat would have exactly the same BMI, but radically different health profiles.

The advantage of BMI is simplicity: you need nothing more than a scale and a tape measure. For population-level health screening, BMI is reasonably predictive because most people fall into patterns where higher BMI correlates with higher body fat. But for individuals — particularly those who exercise regularly — it breaks down.

Body fat percentage bypasses this limitation by measuring what actually matters. That said, the two metrics complement each other:

• Use BMI for a fast, rough screen — the BMI calculator gives you a baseline in seconds.
• Use body fat percentage when you want to know the actual composition of your body, track changes from diet or exercise, or understand why your BMI might be misleading for your body type.

If both indicators point in the same direction — say, obese BMI and high body fat percentage — that's a reliable signal. Where they diverge, body fat percentage is generally the more meaningful number.

Why body fat distribution matters as much as the number

Two people with the same overall body fat percentage can have very different health risks depending on where that fat is stored. Research consistently shows that visceral fat — fat stored around abdominal organs — is far more metabolically dangerous than subcutaneous fat stored under the skin elsewhere on the body.

Visceral fat is metabolically active in a harmful way: it secretes inflammatory cytokines and hormones that increase insulin resistance, raise blood pressure, and contribute to atherosclerosis. You don't need a DEXA scan to get a rough sense of your visceral fat load — waist circumference is a reasonable proxy:

• Men: A waist circumference above 40 inches (102 cm) is associated with significantly elevated cardiometabolic risk.
• Women: A waist circumference above 35 inches (88 cm) carries the same warning.

The "apple vs. pear" body shape distinction reflects this. People who carry excess weight in the abdomen (apple-shaped) tend to have more visceral fat and higher metabolic risk than those who carry it in the hips and thighs (pear-shaped), even at the same total body fat percentage. Waist-to-hip ratio is another commonly used metric for this purpose.

How to lower body fat percentage effectively

Reducing body fat while preserving (or building) lean mass is the goal — not just losing weight indiscriminately. A few principles that the research supports clearly:

• Caloric deficit is the primary driver. You cannot lose fat without being in a caloric deficit over time. How large that deficit is determines the pace of fat loss, with larger deficits producing faster results but increasing the risk of muscle loss alongside fat. A deficit of 300–500 calories per day is generally considered the sweet spot for steady fat loss with minimal muscle loss.
• Protein intake protects muscle during a cut. Higher protein intake (roughly 0.7–1g per pound of body weight) helps preserve lean mass during caloric restriction, so that more of the weight you lose comes from fat rather than muscle. Muscle loss is the main reason people's body fat percentage doesn't improve as much as their scale weight does.
• Resistance training builds the denominator. Lifting weights while in a caloric deficit helps maintain — and sometimes build — muscle mass, which improves your body fat percentage even if total weight barely changes.
• Consistency over intensity. Body fat percentage changes slowly. A realistic rate of fat loss for most people is 0.5–1% of body weight per week. Expecting faster change leads to excessive restriction that backfires via muscle loss and metabolic adaptation.

What to do with your body fat percentage number

Once you have a baseline measurement, use it to set a realistic goal and track progress over time — not as a fixed endpoint. Body fat percentage fluctuates daily with hydration, hormones, and measurement inconsistency, so measure every 4–6 weeks under consistent conditions (same time of day, similar hydration state) rather than daily.

Focus on the trend over months rather than any single reading. A downward trend of even 0.5–1 percentage point per month, sustained over 6 months, represents a meaningful change in body composition. More importantly, pay attention to how you feel and perform, not just the number — improved energy, strength, and cardiovascular endurance often precede visible changes in body fat percentage.

If you haven't already, run your current measurements through the body fat calculator to establish your baseline. For additional context on what a healthy weight looks like at your height — and how different formulas compare — see our breakdown of how much you should weigh for your height.