Body Fat Calculator
Free body fat calculator: enter height, weight, neck and waist (plus hip for women) to estimate body fat, fat mass and lean mass.
| 分类 | 体脂率范围 | 说明 |
|---|
How to Use
- Enter basic details
Choose your sex and enter height and weight. Women also get a hip field.
- Add the circumferences
Fill in neck and waist (plus hip for women). The waist must be larger than the neck or the formula cannot be applied.
- Read the result
The panel shows your body fat percentage, its category, fat mass and lean mass, with the full category table for your sex below.
FAQ
How accurate is the US Navy formula?
Its error is typically ±3%–4% compared with a DEXA scan. The advantage is that it needs only a tape measure, which makes it good for tracking trends. Repeated measurements of the same person are more useful than a single number.
How do I measure the circumferences?
Neck: horizontally around the narrowest point below the Adam's apple. Waist: at the navel for men, at the narrowest point for women. Hip: around the fullest part. Keep the tape snug but not compressing, and measure after a normal exhale.
What body fat is normal?
Roughly 14%–17% for men and 21%–24% for women. Athletes go lower, but staying very low for long affects hormones, immunity and menstrual cycles.
Why does my scale disagree?
Home scales use bioelectrical impedance, which is sensitive to hydration, food and exercise, and can swing by more than 3% within a day. Measure at the same time, fasted, and look at the trend.