Waist-to-Hip Ratio Calculator
Waist-to-hip ratio (WHR) is a simple measure of fat distribution that predicts cardiovascular and metabolic disease risk independently of BMI. Central adiposity (abdominal fat) is more metabolically harmful than subcutaneous fat in the hips and thighs.
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Formula
WHR = Waist circumference ÷ Hip circumference
The ratio is calculated by dividing waist circumference by hip circumference, both measured in the same unit. WHO considers WHR above 0.90 for men and above 0.85 for women as high cardiovascular risk, indicating central obesity. The formula outputs a single dimensionless ratio — higher values indicate more abdominal fat relative to hip size.
How to use the Waist-to-Hip Ratio Calculator
- 1
Enter your waist circumference
Value should be in inches.
- 2
Enter your hip circumference
Value should be in inches.
- 3
Read your results instantly
Results update in real time as you type.
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How to measure accurately
Measure waist circumference at the midpoint between the lower rib and the top of the hip bone (iliac crest), typically at or just above the navel. Measure hip circumference at the widest point of the hips and buttocks. Both measurements should be taken at the end of a normal exhale, with the tape snug but not compressing the skin. Take each measurement twice and average them. Consistent technique matters more than exact landmark — always measure at the same anatomical point each time.
WHR versus BMI for health assessment
BMI classifies weight relative to height but cannot distinguish where fat is stored. Two people with identical BMIs can have very different metabolic risk profiles depending on their fat distribution. A person with most fat stored in the hips and thighs (pear shape) has substantially lower cardiovascular risk than someone with the same BMI but predominantly abdominal fat (apple shape). WHR captures this distribution difference directly. Large prospective studies show WHR predicts cardiovascular mortality better than BMI across multiple ethnic groups.
Tips & Insights
Measure in the morning
Waist and hip measurements are most consistent when taken in the morning before eating or drinking, when bloating is minimal and you are in a fasted state.
Track trends, not single measurements
A single WHR reading is less useful than tracking changes over months. Increasing WHR signals growing abdominal fat accumulation; decreasing WHR indicates cardiovascular risk reduction.
Risk thresholds differ by sex
WHO defines high risk as WHR > 0.90 for men and > 0.85 for women. Some researchers use lower thresholds for Asian populations, where metabolic risk appears at lower WHR values.
Worked Examples
Waist 34", hip 38"
WHR = 0.89 (borderline)
Waist 40", hip 42"
WHR = 0.95 (high risk)
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Frequently Asked Questions
What WHR values indicate low vs high risk?
For men: low risk < 0.90, high risk > 0.90. For women: low risk < 0.80, high risk > 0.85. Values in between are considered moderate risk.
Why is abdominal fat more dangerous than hip fat?
Visceral fat surrounding the abdominal organs releases inflammatory cytokines and free fatty acids directly into the portal circulation, impairing insulin sensitivity and driving cardiovascular disease.
Can exercise reduce waist-to-hip ratio?
Yes. Aerobic exercise, particularly moderate-to-vigorous intensity training, selectively reduces visceral abdominal fat, improving WHR even without large changes in total body weight.
Is WHR better than waist circumference alone?
Waist circumference alone is a good predictor of metabolic risk, and some guidelines now prefer it for simplicity. WHR adds information about body shape relative to hip size, which may matter for certain populations.
Does age affect normal WHR ranges?
WHR tends to increase with age as fat distribution shifts toward the abdomen, particularly after menopause in women. The risk thresholds do not vary by age in current guidelines, though this is an area of ongoing research.
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