What is Waist-to-Hip Ratio?
The Waist-to-Hip Ratio (WHR) is a simple anthropometric measure calculated by dividing the circumference of the waist by the circumference of the hips. It is used as an indicator of body fat distribution and is recognized by the World Health Organization (WHO) as a predictor of cardiovascular disease, type 2 diabetes, and other obesity-related conditions.
WHR helps distinguish between two primary fat distribution patterns: android (apple-shaped, with fat concentrated around the abdomen) and gynoid (pear-shaped, with fat concentrated around the hips and thighs). Android fat distribution is associated with significantly higher health risks compared to gynoid distribution.
The INTERHEART study, a landmark global case-control study of myocardial infarction involving over 27,000 participants across 52 countries, found that WHR was one of the strongest modifiable risk factors for heart attack, outperforming BMI as a predictor.
WHR Formula
Both measurements must be in the same unit (cm or inches). The result is a dimensionless ratio. For example, a man with an 90 cm waist and 100 cm hips has a WHR of 0.90.
WHO Risk Categories
For Males
| WHR Range | Risk Category | Health Implication |
|---|---|---|
| < 0.90 | Low Risk | Healthy fat distribution; lower risk of cardiovascular disease |
| 0.90 – 0.99 | Moderate Risk | Borderline abdominal obesity; increased cardiometabolic risk |
| ≥ 1.0 | High Risk | Central obesity; significantly elevated risk of heart disease, diabetes, and stroke |
For Females
| WHR Range | Risk Category | Health Implication |
|---|---|---|
| < 0.80 | Low Risk | Healthy fat distribution; lower risk of cardiovascular disease |
| 0.80 – 0.84 | Moderate Risk | Borderline abdominal obesity; mildly increased risk |
| ≥ 0.85 | High Risk | Central obesity; significantly elevated risk of heart disease, diabetes, and stroke |
Body Shape Diagram
Apple vs Pear Body Shape
Apple Shape (Android Fat Distribution)
An apple-shaped body carries excess fat primarily around the abdomen, waist, and chest. This pattern is more common in men but also occurs in women, particularly after menopause. Apple-shaped individuals typically have a high WHR (≥0.90 for men, ≥0.85 for women).
The health risks of apple-shaped fat distribution are significant because abdominal fat is largely visceral fat, which surrounds internal organs and is metabolically active. It increases insulin resistance, promotes inflammation, and is strongly associated with:
- Coronary heart disease and heart attack
- Type 2 diabetes mellitus
- Stroke
- Metabolic syndrome
- Sleep apnea
- Certain cancers (colorectal, breast post-menopause)
Pear Shape (Gynoid Fat Distribution)
A pear-shaped body stores fat primarily around the hips, buttocks, and thighs. This pattern is more common in pre-menopausal women due to the influence of estrogen on fat distribution. Pear-shaped individuals typically have a lower WHR (<0.80 for women, <0.90 for men).
Hip and thigh fat is primarily subcutaneous fat, which is less metabolically harmful than visceral fat. Some research even suggests that gluteal-femoral fat may be protective, as it can act as a metabolic sink for free fatty acids, keeping them away from vital organs. Pear-shaped fat distribution is associated with:
- Lower cardiovascular disease risk compared to apple shape
- Better insulin sensitivity
- Potentially protective metabolic effects
- Some increased risk of varicose veins and joint problems in lower extremities
Measurement Technique
Waist Measurement
- Stand upright with feet shoulder-width apart and arms relaxed at your sides
- Locate the narrowest part of your torso, typically just above the belly button and below the rib cage
- If no narrowing is visible, measure at the level of the navel (umbilicus)
- Wrap the tape measure snugly (but not tight) around the waist, keeping it parallel to the floor
- Breathe out normally and take the reading — do not hold your breath or suck in your stomach
- Measure against bare skin for accuracy
Hip Measurement
- Stand with feet together
- Find the widest part of your buttocks — this is the point of maximum hip circumference
- Wrap the tape measure around this widest point, keeping it level and parallel to the floor
- Ensure the tape is snug but not compressing the skin
- View the tape from the side in a mirror to ensure it has not dropped or risen
- Take 2–3 measurements and use the average for best accuracy
Cardiovascular & Metabolic Risks
The relationship between WHR and health risk has been extensively studied. The WHO identifies abdominal obesity as a major risk factor for several chronic diseases. Key findings from major studies include:
- INTERHEART Study (2004): WHR was strongly associated with myocardial infarction risk across all ethnic groups. Patients in the highest WHR quintile had 2.5 times the risk of heart attack compared to the lowest quintile.
- Metabolic Syndrome: High WHR is one of the diagnostic criteria for metabolic syndrome (along with high blood pressure, elevated fasting glucose, high triglycerides, and low HDL cholesterol). Having 3 or more of these criteria dramatically increases cardiovascular risk.
- Type 2 Diabetes: Central obesity as measured by WHR is a stronger predictor of diabetes than BMI. The Nurses' Health Study found that women with a WHR ≥0.88 had 3.2 times the risk of type 2 diabetes compared to those with WHR <0.72.
- Stroke: Higher WHR is associated with increased stroke risk, independent of BMI and other traditional risk factors.
Worked Example
A male with a waist circumference of 92 cm and hip circumference of 100 cm:
For a male, a WHR of 0.92 falls in the Moderate Risk category (0.90–0.99). This indicates a borderline apple-shaped body with some excess abdominal fat. Reducing waist circumference to below 90 cm (WHR < 0.90) would move into the low-risk zone.
A female with a waist circumference of 72 cm and hip circumference of 98 cm:
For a female, a WHR of 0.73 falls in the Low Risk category (<0.80). This indicates a healthy pear-shaped body with fat distributed primarily around the hips and thighs.
Frequently Asked Questions
What is a good waist-to-hip ratio?
According to WHO criteria, a healthy WHR is below 0.90 for men and below 0.80 for women. Values above these thresholds indicate increasing abdominal fat and associated health risks.
Is WHR more important than BMI?
They measure different things and are complementary. BMI assesses overall body mass, while WHR assesses fat distribution. For predicting cardiovascular and metabolic disease, WHR is generally a stronger predictor. Ideally, both should be used together for a comprehensive health assessment.
Can exercise change my WHR?
Yes. Regular cardiovascular exercise and strength training can preferentially reduce abdominal fat, improving your WHR. Studies show that aerobic exercise is particularly effective at reducing visceral fat, even without significant weight loss on the scale.
Does menopause affect WHR?
Yes. After menopause, declining estrogen levels cause a shift in fat distribution from the hips and thighs (gynoid pattern) to the abdomen (android pattern). This is why post-menopausal women often see their WHR increase and should be especially vigilant about abdominal fat accumulation.
How does WHR relate to metabolic syndrome?
An elevated WHR is one of the key indicators of metabolic syndrome, a cluster of conditions that together dramatically increase the risk of heart disease, stroke, and type 2 diabetes. The other components are high blood pressure, high blood sugar, high triglycerides, and low HDL cholesterol.