Waist to Hip Ratio (WHR) Calculator | WHO Central Obesity Risk Assessment
Waist-to-Hip Ratio (WHR) is a powerful indicator of body fat distribution and central obesity. Unlike BMI, which only measures overall weight relative to height, WHR specifically evaluates the proportion of abdominal fat—an important risk factor for cardiovascular disease, type 2 diabetes, and metabolic syndrome.
The WHO defines central obesity as WHR >= 0.90 for men and >= 0.85 for women. This calculator provides health classification based on these international standards and explains the disease risk implications of different WHR levels.
All calculations and data on this website are for informational reference only. This tool does not provide medical advice, diagnosis, or treatment. For health-related concerns, please consult a qualified healthcare professional.
WHR Calculation Input
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Calculation Examples
Example 1 �?Male: Waist 85 cm, Hip 95 cm
WHR = 85 / 95 = 0.89
Classification = Normal
Central Obesity = Not Present
Risk Level = Low-Moderate
Note: Close to WHO threshold of 0.90
Classification = Normal
Central Obesity = Not Present
Risk Level = Low-Moderate
Note: Close to WHO threshold of 0.90
Example 2 �?Female: Waist 80 cm, Hip 90 cm
WHR = 80 / 90 = 0.89
Classification = Central Obesity
Central Obesity = Present
Risk Level = Elevated
Note: Exceeds WHO threshold of 0.85 for women
Classification = Central Obesity
Central Obesity = Present
Risk Level = Elevated
Note: Exceeds WHO threshold of 0.85 for women
Data Source and References
- [1] World Health Organization (2018). Global Action Plan on Physical Activity 2018-2030. WHO Press.
- [2] WHO (2000). Obesity: Preventing and managing the global epidemic. WHO Technical Report Series 894.
- [3] NHLBI (2021). Clinical guidelines on the identification, evaluation, and treatment of overweight and obesity in adults. NIH Publication.
- [4] Yusuf S et al. (2005). Obesity and the risk of myocardial infarction in 27 000 participants from 52 countries: a case-control study. Lancet, 366(9497):1640-1649.
WHO Waist to Hip Ratio Classification
The World Health Organization classifies WHR levels based on central obesity risk. These thresholds are internationally recognized and used in clinical practice.
| WHR Range | Male Classification | Female Classification | Disease Risk Level |
|---|---|---|---|
| < 0.80 | Low | Low | Low |
| 0.80 �?0.89 | Normal | Borderline | Low-Moderate |
| 0.90 �?0.99 | Borderline | Central Obesity | Moderate-High |
| >= 1.00 | Central Obesity | Severe Central Obesity | High |
WHO Central Obesity Thresholds by Region
Different ethnic groups may have different body composition characteristics. WHO recognizes regional variations in WHR cutoffs:
| Population Group | Male Threshold | Female Threshold | Source |
|---|---|---|---|
| European/North American | >= 0.90 | >= 0.85 | WHO Global Standard |
| South Asian | >= 0.85 | >= 0.80 | WHO Regional Guidelines |
| East Asian (Chinese/Japanese) | >= 0.85 | >= 0.80 | WHO Regional Guidelines |
| Middle Eastern | >= 0.90 | >= 0.85 | WHO Regional Guidelines |
Health Risks Associated with High WHR
Elevated waist-to-hip ratio is associated with multiple adverse health outcomes:
- Cardiovascular Disease: Increased risk of hypertension, dyslipidemia, and coronary heart disease
- Type 2 Diabetes: Strong predictor of insulin resistance and diabetes development
- Metabolic Syndrome: WHR is one of the five diagnostic criteria
- Certain Cancers: Increased risk of colorectal, breast, and endometrial cancers
- All-Cause Mortality: Higher WHR independently predicts increased mortality risk
Measurement Guidelines
Accurate WHR measurement requires proper technique:
| Measurement | Location | Technique |
|---|---|---|
| Waist | Narrowest part of torso, typically above navel | Standing, relaxed, tape parallel to floor, no compression |
| Hip | Widest part of hips/buttocks | Standing, relaxed, tape parallel to floor, measure at maximum circumference |
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Frequently Asked Questions
-
Waist-to-hip ratio (WHR) is a simple anthropometric index calculated by dividing waist circumference by hip circumference. It measures the distribution of body fat, specifically the proportion of abdominal fat relative to hip fat. WHR is considered a better indicator of central obesity than BMI alone because it captures fat distribution patterns that correlate with metabolic and cardiovascular disease risk.
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WHO defines central obesity as WHR >= 0.90 for men and >= 0.85 for women. These thresholds indicate increased risk of cardiovascular disease, type 2 diabetes, and metabolic syndrome. However, some regional guidelines use slightly different cutoffs: South Asians use >= 0.85 for men and >= 0.80 for women; Japanese use >= 0.85 for men and >= 0.80 for women.
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For waist measurement: Place tape at narrowest part of torso, usually just above belly button, parallel to floor, not compressing skin. For hip measurement: Place tape at widest part of hips/buttocks, parallel to floor. Measurements should be taken while standing relaxed, breathing normally. Use a flexible measuring tape for accuracy.
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Abdominal fat (visceral fat) is metabolically active and releases pro-inflammatory cytokines and free fatty acids into the bloodstream. This contributes to insulin resistance, hypertension, dyslipidemia, and inflammation—key risk factors for cardiovascular disease and type 2 diabetes. Hip fat (subcutaneous fat) is less metabolically active and does not have the same adverse health effects.
All calculations and data on this website are for informational reference only. This tool does not provide medical advice, diagnosis, or treatment. For health-related concerns, please consult a qualified healthcare professional.