Body Fat Calculator
This free body fat calculator estimates your body fat percentage using the trusted U.S. Navy tape-measure method, no special equipment needed. Grab a soft tape measure, enter a few measurements below, and see your body fat percentage, category, and how much of your weight is fat versus lean mass.
How to measure correctly
Your result is only as good as your measurements, so take a minute to get them right. Use a flexible cloth or vinyl tape, keep it snug but not squeezing, stand relaxed, and don’t suck in your stomach. Measure each spot twice and use the average.
- Neck: just below your Adam’s apple, with the tape sloping slightly downward toward the front.
- Waist: for men, around the belly button; for women, around the narrowest part of the waist. Relax and breathe out normally.
- Hip (women only): around the widest part of your hips and buttocks, keeping the tape level.
Measure at the same time of day for the most consistent tracking, first thing in the morning works well.
What your body fat result means
Your number is an estimate of what percentage of your body weight is fat. Everyone needs some, it protects your organs and supports your hormones, but very high and very low levels both carry risks. Here’s how the widely used American Council on Exercise ranges break down:
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Above average | 25%+ | 32%+ |
Women naturally carry more essential fat than men, which is why the healthy ranges differ. There’s no single “right” number, the fitness and average ranges are healthy and realistic targets for most beginners.
Why body fat matters more than the scale
Two people can weigh exactly the same but look and feel completely different, because the scale can’t tell muscle from fat. Body fat percentage fills that gap. It’s often a better gauge of your fitness and health than weight alone, and it explains why someone can get leaner and stronger without the scale moving much.
That’s the perfect companion to our ideal weight calculator and BMI calculator: those look at your weight, while this looks at what that weight is made of. Together they give you a much fuller picture than any single number.
How this calculator works
We use the U.S. Navy method, developed by Hodgdon and Beckett, which estimates body fat from the circumference of your neck and waist (plus hips for women) relative to your height. If you enter imperial units, we convert everything to a consistent scale first.
It’s popular for good reason: it needs nothing but a tape measure and is reasonably accurate, typically within about 3–4% of a lab scan (like a DEXA) for most people. It’s not perfect, no simple method is, but it’s free, repeatable, and ideal for tracking your progress over time. For that, consistency matters more than pinpoint accuracy: measure the same way each time and watch the trend.
Other ways to measure body fat
The tape method is a great free option, but you’ll come across others. Here’s how they compare:
- Skinfold calipers: pinch tests at several sites. Accurate in skilled hands, but tricky to do well on yourself.
- Bioelectrical impedance (smart scales and handheld machines): convenient, but readings swing with hydration and time of day, so treat them as rough.
- DEXA scan: the gold standard for accuracy, done at a clinic, but it costs money and isn’t something you’d do often.
For everyday tracking at home, the tape method here is hard to beat on value. Whichever you choose, the golden rule is the same: use one method consistently and follow the trend.
How to lower your body fat
If your goal is to reduce body fat, the approach is refreshingly simple, if not always easy. Focus on these four, and let time do the rest:
- Eat in a modest calorie deficit. Use our calorie calculator to find a sensible target, then aim to lose weight slowly.
- Prioritise protein. Enough protein protects your muscle while you lose fat, so more of what you lose is fat.
- Strength train. Building or keeping muscle improves your shape and your body-fat percentage even at the same weight.
- Add movement. Walking and cardio nudge up your daily burn. Our home workout for weight loss ties it together.
Aim to lose fat gradually, around half a kilogram to one kilogram (one to two pounds) a week is realistic and sustainable.
Common measuring mistakes to avoid
Almost every “weird” body fat reading comes down to a measuring slip. Sidestep these and your results will be far more reliable:
- Pulling the tape too tight. It should sit snug against your skin without compressing it. Too tight reads low, too loose reads high.
- Sucking in your stomach. Stand relaxed and breathe out normally, don’t brace or hold your breath.
- Measuring a different spot each time. Even a couple of centimetres up or down changes the number. Use the same landmarks every session.
- Measuring after a big meal or a workout. Bloating and a post-workout “pump” both skew the reading. First thing in the morning is most consistent.
- Expecting big day-to-day changes. Body fat shifts slowly. A jumpy reading usually means a measuring difference, not real change.
How often should you re-check?
Because body fat changes gradually, there’s no need to measure often. Once every two to four weeks is plenty, and checking daily will only frustrate you with normal fluctuations.
The trick is to keep the conditions the same each time: measure in the morning, with the same tape, at the same spots, before eating. Then judge your progress by the trend over a couple of months, not any single reading. Pairing your numbers with progress photos gives you an even clearer, more motivating picture of how your body is really changing.
Frequently asked questions
What is a healthy body fat percentage?
For men, roughly 10–20% is a healthy, fit range; for women it’s about 18–28%. The “fitness” and “average” categories above are realistic, healthy targets for most people. Women naturally and healthily carry more than men.
What is a good body fat percentage for men?
Around 10–17% is lean and athletic for men, while up to about 24% is still within the average, healthy range. Below roughly 6% is essential fat only and not advisable to maintain.
What is a good body fat percentage for women?
Around 18–24% is fit and athletic for women, with up to about 31% still in the average, healthy range. Women shouldn’t drop below roughly 13%, as some fat is essential for health and hormones.
How accurate is the U.S. Navy body fat method?
It’s reasonably accurate, usually within about 3–4% of a DEXA scan for most people, and very good for tracking change over time. Accurate measuring is key, take your time and measure the same way each session.
How do I measure my body fat at home?
All you need is a soft tape measure. Measure your neck and waist (and hips if you’re a woman) as described above, enter them here with your height and weight, and the calculator does the rest. No calipers or machine required.
Body fat percentage vs BMI, which is better?
They answer different questions. BMI is a quick weight-to-height screen, while body fat percentage estimates how much of you is actually fat. Body fat gives a truer picture of body composition, especially for muscular people. Using both together is ideal.
How do I lower my body fat percentage?
Combine a modest calorie deficit with plenty of protein, strength training, and regular movement. Lose weight slowly to keep muscle, and the percentage falls as you drop fat and maintain lean mass. There’s no need for extreme dieting.
Are calipers or the tape method better?
Both are affordable estimates. Calipers can be accurate in trained hands but are hard to use on yourself; the tape method is easier to do consistently at home. For most beginners tracking progress, the tape method is the more practical choice.
What body fat percentage do you need to see abs?
Visible abs typically show up around 10–12% for men and about 18–20% for women, though it varies with genetics and where you store fat. Chasing very low levels isn’t necessary or healthy for most people.
Can body fat be too low?
Yes. Dropping below the essential-fat level (about 2–5% for men, 10–13% for women) can harm your hormones, energy, immune system, and, for women, menstrual health. Healthy is the goal, not the lowest possible number.
References
The calculation uses the U.S. Navy circumference method (Hodgdon & Beckett, 1984). Category ranges follow the American Council on Exercise guidelines. For general guidance on healthy weight and body composition, see the CDC.
What should I do next?
Body fat is just one number. Here is where to go next on your journey.
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