Two people can have an identical BMI and body weight, yet carry meaningfully different health risks purely based on where their fat is distributed. Waist-to-hip ratio is one of the simplest tools for capturing this, and it addresses one of BMI’s clearest blind spots – see our guide on what BMI can and can’t tell you.
How to Calculate It
Waist-to-hip ratio is calculated by dividing waist circumference by hip circumference:
Waist-to-Hip Ratio = Waist Circumference ÷ Hip Circumference
To measure accurately: measure your waist at its narrowest point (usually just above the belly button), and your hips at their widest point, using a flexible tape measure without pulling it tight, standing relaxed rather than pulling your stomach in.
Why Fat Distribution Matters
Fat carried around the abdomen (sometimes described as “apple-shaped” distribution) is more strongly associated with increased risk of cardiovascular disease, type 2 diabetes and metabolic syndrome than fat carried around the hips and thighs (“pear-shaped” distribution). This is because abdominal fat, particularly visceral fat surrounding internal organs, is more metabolically active in ways linked to inflammation and insulin resistance than fat stored elsewhere on the body.
General Risk Categories
| Waist-to-Hip Ratio | Sex | General Risk Category |
|---|---|---|
| Below 0.80 | Women | Lower risk |
| 0.80–0.85 | Women | Moderate risk |
| Above 0.85 | Women | Higher risk |
| Below 0.90 | Men | Lower risk |
| 0.90–1.0 | Men | Moderate risk |
| Above 1.0 | Men | Higher risk |
These general categories, broadly aligned with World Health Organization reference points, illustrate why the same ratio value carries different risk implications for men and women, reflecting typical differences in natural fat distribution between the sexes.
Waist-to-Hip Ratio vs BMI
Some research has suggested waist-to-hip ratio may be a stronger predictor of cardiovascular risk than BMI alone in certain populations, precisely because it captures fat distribution rather than just overall size. This doesn’t mean it should replace BMI entirely, but using both measures together – as covered in our broader guide on BMI vs body fat percentage – provides a more complete picture than either alone.
What to Do If Your Ratio Falls in a Higher-Risk Range
A higher-risk waist-to-hip ratio is a signal worth taking seriously, but it’s not a diagnosis in itself. Practical, well-supported steps include working toward a moderate, sustainable calorie deficit if overall weight loss is appropriate (see our Calorie Deficit Calculator), maintaining regular physical activity, and discussing your result with a GP, particularly if combined with other risk factors like family history of cardiovascular disease or diabetes.
Frequently Asked Questions
Can I reduce abdominal fat specifically through exercise?
Spot-reduction – losing fat from one specific area through targeted exercise – isn’t well supported by evidence; overall fat loss through a calorie deficit tends to reduce fat across the body generally, including the abdominal area, rather than any single region in isolation.
Is waist-to-hip ratio more useful than just measuring waist circumference alone?
Both are used in different contexts; waist circumference alone is also a widely used, simpler measure of abdominal fat risk, while waist-to-hip ratio adds context about overall body shape relative to hip size.
Does waist-to-hip ratio apply the same way to all ethnicities?
Some research suggests risk thresholds may vary somewhat between different population groups, similar to the nuance discussed around BMI thresholds in our healthy BMI range guide, so it’s best interpreted alongside professional clinical guidance rather than in isolation.
How often should I measure my waist-to-hip ratio?
Checking every few months, using a consistent measuring technique, provides a useful trend indicator without needing to measure more frequently than that.