Your waist-to-hip ratio (WHR) is one of the most useful — and most overlooked — numbers in preventive health. While BMI gets all the attention, WHR specifically measures how your body fat is distributed, and that distribution turns out to be a better predictor of heart disease, type 2 diabetes, and metabolic syndrome than weight alone. A person with a "normal" BMI can still carry enough abdominal fat to fall into a high-risk category on the waist-to-hip ratio scale.
How to Measure Waist and Hips Correctly
Measurement technique matters more than most people realize. Two common mistakes — measuring the wrong spot and reading over clothing — can throw off your ratio by 0.05 or more, which is enough to shift you across a risk category.
- Waist: Measure at the narrowest point of your torso, typically halfway between the bottom of your ribs and the top of your hip bones. Exhale normally; do not suck in your stomach. The tape should be snug but not compressing.
- Hips: Measure at the widest point across your buttocks — usually 7–9 inches below the waist measurement. This is the widest part of the lower body, not the hip bones themselves.
- Bare skin only: Clothing adds false inches. Measure directly on skin for both readings.
The calculation is straightforward: divide waist by hips, both in the same unit.
WHR = waist measurement ÷ hip measurementFor example, a woman with a 31-inch waist and 39-inch hips has a WHR of 31 ÷ 39 = 0.79 — low risk by WHO standards.
Waist-to-Hip Ratio Healthy Range by Sex
The World Health Organization publishes risk thresholds based on large epidemiological studies linking WHR to cardiovascular outcomes. The cutoffs differ by sex because women naturally carry more subcutaneous fat on the hips and thighs — a higher WHR for a woman signals a more meaningful shift toward abdominal fat than the same number would for a man.
| Risk Level | Men | Women |
|---|---|---|
| Low risk | Below 0.90 | Below 0.80 |
| Moderate risk | 0.90 – 0.99 | 0.80 – 0.85 |
| High risk | 1.00 or above | 0.86 or above |
Source: World Health Organization, Waist Circumference and Waist–Hip Ratio: Report of a WHO Expert Consultation (2008).
A man with a 38-inch waist and 42-inch hips has a WHR of 38 ÷ 42 = 0.90 — right at the boundary of moderate risk. Losing two inches from the waist (to 36) would drop his WHR to 0.86 and move him firmly into the low-risk range.
Why WHR Predicts Cardiovascular Risk Better Than BMI
BMI uses only height and weight, so it cannot distinguish between someone who carries their extra weight in the hips and thighs versus the abdomen. Visceral fat — the fat stored around internal organs — is metabolically different from subcutaneous fat. It releases inflammatory compounds called cytokines and interferes with insulin signaling, raising the risk of insulin resistance, elevated triglycerides, and arterial inflammation.
A 2012 study published in the European Heart Journal tracked over 27,000 people and found WHR was a significantly stronger predictor of heart attack risk than BMI. Importantly, about one-third of participants with a "normal" BMI had an elevated WHR — and their actual cardiovascular risk resembled that of people classified as obese by BMI, not their lean-BMI peers.
That said, WHR is not a complete picture on its own. Clinicians typically use it alongside BMI, waist circumference, blood pressure, and lipid panels rather than as a standalone diagnostic.
What to Do If Your Ratio Is High
Abdominal fat responds more readily to lifestyle changes than hip and thigh fat — which is actually encouraging news for anyone whose WHR is in the moderate or high range.
- Aerobic exercise: Moderate-intensity cardio — 150+ minutes per week of brisk walking, cycling, or swimming — directly reduces visceral fat, often before changes are visible on a scale. A study in Obesity found aerobic exercise reduced visceral fat by roughly 6% over 8 months with no dietary changes.
- Resistance training: Building muscle in the legs and glutes increases hip circumference, which lowers WHR mechanically — and the added muscle mass also improves insulin sensitivity independently.
- Caloric deficit: A modest deficit of 300–500 calories per day produces consistent fat loss, with abdominal stores typically mobilized early. Very aggressive deficits often cause lean tissue loss that offsets the benefit.
- Sleep: Chronic sleep deprivation elevates cortisol, which preferentially deposits fat in the abdomen. Getting 7–9 hours consistently is not optional if abdominal fat reduction is the goal.
Measure your waist and hips monthly under consistent conditions — same time of day, fasted, bare skin — to track progress. Small gains compound: a one-inch reduction in waist with hips unchanged drops a man's WHR from 0.90 to 0.88, shifting from moderate to low risk. If you want to establish your baseline and see exactly where you fall on the WHO scale, you can calculate your ratio here in about 30 seconds.