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BMI vs Body Fat for Women
BMI is quick and free. Body fat percentage is more detailed. Here is how they compare.
What BMI measures and what it misses
| BMI | Body fat % | |
|---|---|---|
| Needs | Height and weight | Scales, calipers or a scan |
| Separates fat from muscle | No | Yes |
| Cost | Free | Free to hundreds of dollars |
| Accuracy for individuals | Moderate | Depends on the method |
Rough body fat ranges for women
| Description | Body fat |
|---|---|
| Essential fat | 10 – 13% |
| Athletic | 14 – 20% |
| Fit | 21 – 24% |
| Average | 25 – 31% |
| Higher risk | 32% and above |
Different organisations publish slightly different ranges, and healthy body fat tends to rise with age.
Using both
If you lift weights or play sport, your BMI may overstate your risk. If you are less active or older, your BMI may look fine while muscle has been replaced by fat. A waist measurement is a free, quick way to cross-check either result, so try the waist-to-height ratio calculator.
Frequently asked questions
Is body fat percentage better than BMI?
Body fat percentage describes body composition more directly, but it is harder to measure accurately. Home scales and handheld devices can be off by several percentage points, so use them to track trends and not as an exact number.
What is a healthy body fat percentage for women?
Women need more essential fat than men. As a rough guide, about 21 to 32 per cent is considered a healthy range for most adult women, with athletes lower and older women a little higher. Ranges vary between sources and with age.
Can I have a healthy BMI and still too much body fat?
Yes. This is sometimes called normal weight obesity, and it is more common in women and older adults who have lost muscle. Waist measurement and strength can help to reveal it.