Waist to Hip Ratio Calculator
Measure your waist-to-hip ratio to assess cardiovascular and metabolic risk. WHO-based thresholds with body shape classification.
Calculate Your Waist-to-Hip Ratio
What Is Waist-to-Hip Ratio?
Unlike BMI, which only considers height and weight, WHR distinguishes between dangerous visceral fat (stored around organs in the abdomen) and less harmful subcutaneous fat (stored in the hips and thighs). Two people with the same BMI can have dramatically different health risk profiles based on where they carry their weight — and WHR captures this difference.
Medical Disclaimer: This tool provides general educational estimates. Always consult your prescribing physician or healthcare provider before making medication changes or interpreting results from population-based models.
Contents
Waist-to-Hip Ratio Risk Chart
WHO and research-based risk categories for waist-to-hip ratio by sex.
| Risk Level | Men (WHR) | Women (WHR) | Health Implications |
|---|---|---|---|
| Low Risk | <0.90 | <0.80 | Healthier fat distribution pattern |
| Moderate Risk | 0.90-0.95 | 0.80-0.85 | Approaching high-risk threshold |
| High Risk | 0.95-1.00 | 0.85-0.90 | Substantially increased cardiovascular and metabolic risk |
| Very High Risk | ≥1.00 | ≥0.90 | Strongly associated with diabetes, heart disease, and mortality |
Source: WHO Technical Report Series 894 (2000). Risk thresholds are population-level guidelines — individual risk depends on additional factors including age, ethnicity, physical activity, and family history.
How to Measure Waist and Hips Correctly
Accurate measurements are essential for a meaningful WHR. Small errors can shift your result by 0.02-0.05, potentially changing your risk category.
Waist Measurement
- Where: At the narrowest point of your torso — usually at or just above the navel (belly button). The WHO recommends the midpoint between the lowest rib and the top of the iliac crest (hip bone).
- How: Stand upright, breathe out gently, and wrap a flexible tape measure around your waist. Keep the tape snug but not compressing the skin. The tape should be level all the way around (not angled).
- Don't: Suck in your stomach — measure in a relaxed, natural position.
Hip Measurement
- Where: At the widest point of the buttocks. Stand with feet together and find the maximum circumference.
- How: Wrap the tape measure around the widest part, keeping it level and parallel to the floor. You may need a mirror or help from someone to ensure the tape is straight in the back.
- Tip: Wear thin clothing or measure over underwear only. Thick clothing can add 1-2 inches to your measurement.
WHR vs. BMI: Which Is Better?
Both metrics have value, but they measure different things — and WHR often catches risks that BMI misses.
| Feature | WHR | BMI |
|---|---|---|
| What it measures | Fat distribution (where) | Overall body size (how much) |
| Cardiovascular risk prediction | Stronger predictor | Weaker predictor |
| Distinguishes muscle from fat | Partially (muscular people score lower) | No (classifies muscular people as overweight) |
| Equipment needed | Tape measure | Scale + height measurement |
| Key limitation | Doesn't capture total body fat | Doesn't capture fat distribution |
The INTERHEART study (Yusuf et al., 2005) — a landmark study of 27,000 heart attack patients across 52 countries — found that WHR was a significantly stronger predictor of myocardial infarction than BMI. Participants in the highest WHR quintile had 2.5x the heart attack risk of those in the lowest, even after adjusting for other risk factors.
Waist Circumference Thresholds
Waist circumference alone (without hip measurement) is also a validated indicator of health risk. The NHLBI and IDF use the following thresholds:
| Risk Level | Men | Women |
|---|---|---|
| Normal | <94 cm (37 in) | <80 cm (31.5 in) |
| Increased Risk | 94-102 cm (37-40 in) | 80-88 cm (31.5-34.6 in) |
| Substantially Increased | ≥102 cm (40 in) | ≥88 cm (34.6 in) |
Note: These thresholds are based on European/American populations. The IDF recommends lower thresholds for South Asian, Chinese, and Japanese populations (men ≥90 cm, women ≥80 cm).
Frequently Asked Questions
What is a good waist-to-hip ratio?
For men, a WHR below 0.90 is considered low risk by the WHO. For women, below 0.80 is low risk. These thresholds are based on large population studies linking WHR to cardiovascular disease, type 2 diabetes, and mortality. A lower WHR generally indicates a more favorable fat distribution — meaning less visceral (abdominal) fat relative to hip/thigh fat.
Is waist-to-hip ratio better than BMI?
For predicting cardiovascular risk, yes. The INTERHEART study (27,000+ participants, 52 countries) found WHR was a significantly stronger predictor of heart attack than BMI. However, BMI is still useful for assessing overall obesity. The best approach is to use both metrics together — BMI tells you how much excess weight you carry, while WHR tells you where you carry it.
What does apple-shaped vs. pear-shaped mean?
"Apple-shaped" describes people who carry more fat around the midsection (higher WHR). This pattern is associated with higher visceral fat and greater health risk. "Pear-shaped" describes those who carry more fat in the hips and thighs (lower WHR), which is associated with lower metabolic risk. Men tend toward apple-shaped distribution, while pre-menopausal women tend toward pear-shaped — though this shifts after menopause as estrogen levels decline.
How do I reduce my waist-to-hip ratio?
Reducing WHR means losing abdominal fat specifically. Research shows that aerobic exercise (walking, running, cycling) is particularly effective at reducing visceral fat, often more so than diet alone. Reducing refined carbohydrates and alcohol intake can also preferentially reduce abdominal fat. Strength training builds muscle in the hips and legs, which can increase hip circumference and lower WHR. Note: spot reduction (targeting belly fat with ab exercises) does not work — overall caloric deficit combined with exercise is the evidence-based approach.
Does waist-to-hip ratio change with age?
Yes. WHR typically increases with age in both men and women. In women, menopause causes a significant redistribution of body fat from the hips/thighs to the abdomen due to declining estrogen levels, which can increase WHR by 0.05-0.10 over several years. In men, the increase is more gradual. This age-related shift partly explains why cardiovascular risk increases after menopause in women.
Where exactly should I measure my waist?
The WHO recommends measuring at the midpoint between the lowest rib and the top of the iliac crest (the bony ridge of the hip). In practice, this is usually at or slightly above the navel for most people. Stand upright with feet shoulder-width apart, breathe out gently, and keep the tape level. Don't suck in your stomach — measure in a relaxed position for an accurate reading.
Sources & Methodology
- World Health Organization. Obesity: Preventing and Managing the Global Epidemic. WHO Technical Report Series 894. Geneva: WHO; 2000.
- Yusuf S, Hawken S, Ounpuu S, et al. Obesity and the risk of myocardial infarction in 27,000 participants from 52 countries: a case-control study. Lancet. 2005;366(9497):1640-1649.
- National Heart, Lung, and Blood Institute. Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. NIH Publication No. 98-4083. 1998.
- International Diabetes Federation. The IDF consensus worldwide definition of the metabolic syndrome. 2006.
This calculator uses peer-reviewed formulas and clinical guidelines. Results are estimates and should not replace professional medical advice.