Your body fat percentage shows how much of your weight is fat compared with muscle, bone and water. This guide explains what that figure means, why it matters and how to check it without complication.
Understanding body fat percentage
Your body fat percentage is simply fat mass divided by total weight, expressed as a percentage. If you weigh 70 kg and 14 kg of that is fat, your body fat percentage is 20 % (14 ÷ 70 × 100). It gives a sharper picture than the bathroom scales, because two people can tip the same scales yet carry entirely different amounts of fat.
Fat stores differently in men and women, so healthy ranges aren’t identical. Men usually stay healthy between about 10–20 %, while women sit closer to 20–30 %. Staying within those bands usually signals enough muscle and not too much spare fat around the waist or organs.
How to work it out, step by step
- Select your gender.
- Measure and enter height, neck and waist (women also enter hip).
- See your estimated body fat percentage and category.
U.S. Navy circumference method (log-based), separate formulas for men and womenWhy it matters
Overlook your body fat percentage and you might wonder why your shirt feels tighter even though the scales haven’t moved, or why your blood pressure nudges up when the weight on the dial hasn’t changed. Too many people fixate on shedding kilos instead of lowering fat, so they pile on endless cardio, lose muscle and end up putting the fat back on sooner than they expect.
Free tools for this
| Tool | What it does |
|---|---|
| Body Fat Calculator | Estimate your body fat percentage using the U.S. Navy tape method. |
| BMI Calculator | Find your Body Mass Index (BMI) and weight category in seconds. |
| Ideal Weight Calculator | Estimate a healthy target weight range for your height and gender. |
Try the Body Fat Calculator
Skip the manual maths — enter your numbers and get the answer instantly.
Open the Body Fat Calculator →Good to know
Remember that these figures are general guides, not medical advice. Bodies differ, so treat the result as a starting point and speak to a qualified professional before making decisions about your health.
Key takeaways
- Use the free Body Fat Calculator (U.S. Navy tape method) for a quick, no-gym reading.
- Healthy ranges sit roughly between 10–20 % for men and 20–30 % for women.
- Track the percentage, not just weight, to spot hidden fat changes.
Frequently asked questions
How accurate is the U.S. Navy method?
It is an estimate, not a reading. Compared with a DEXA scan it can be several percentage points out either way. It is far better at showing whether your body fat is rising or falling over time than at pinning down a precise figure.
Why does it not ask for my weight?
The Navy equations do not use it. They work purely from height and circumference measurements, which is what lets the same formula work without a scale.
Why do women need a hip measurement?
The female equation uses waist plus hip minus neck, because typical female fat distribution is not captured by the waist alone. The male equation uses only waist minus neck.
How should I measure to get a consistent result?
Same conditions every time: same time of day, relaxed and not holding your stomach in, tape level and snug without digging in. Consistency matters more than perfection because you are watching a trend.
Why did I get an error?
For men the waist must be larger than the neck, and for women a hip measurement is required — otherwise the logarithm has nothing valid to work with. Check that every measurement is in centimetres.
