Formula & Calculator
Waist-to-Hip Ratio
Simple ratio used to assess body fat distribution and associated health risk.
Interpretation
WHR = waist_circumference / hip_circumference. Measures fat distribution, indicating health risk. Higher ratios (apple shape) associated with cardiovascular risk.
Variables
| Symbol | Quantity | Unit |
|---|---|---|
| WHR | Waist-to-hip ratio | |
| waist_circumference | Waist circumference | cm |
| hip_circumference | Hip circumference | cm |
What it means
The waist‑to‑hip ratio (WHR) is an anthropometric measure that compares the circumference of the waist and hips. It is used as an indicator of central obesity and associated health risks. A higher WHR (greater than 0.9 for men, 0.85 for women) indicates a higher proportion of abdominal fat, which is linked to increased risk of cardiovascular disease, type 2 diabetes, and metabolic syndrome. It is more informative than BMI in assessing risk from fat distribution. WHR is used in clinical and epidemiological studies, and in fitness assessments. Understanding WHR helps in identifying those at higher risk and in tailoring interventions.
Worked example
Waist‑to‑Hip Ratio – Two Detailed Examples
Real‑World| Parameter | Value |
|---|---|
| waist (cm) | 80 |
| hip (cm) | 95 |
| Parameter | Value |
|---|---|
| waist | 90 |
| hip | 100 |
Common mistakes
- Waist circumference: Measure at the narrowest point between the ribs and iliac crest.
- Hip circumference: Measure at the widest point of the buttocks.
- Both in the same units: Use cm or inches – ratio is dimensionless.
- Interpretation: WHR > 0.9 (men) or >0.85 (women) indicates increased cardiovascular risk.
- Limitations: Does not reflect total body fat – waist circumference alone is also useful.
Applications
Waist‑to‑hip ratio (WHR) is a measure of abdominal obesity, calculated by dividing waist circumference by hip circumference. It is a better predictor of cardiovascular disease risk than BMI alone, as it reflects visceral fat. Healthcare professionals use WHR to screen for metabolic syndrome, to assess risk for heart disease and type 2 diabetes, and to monitor changes in body fat distribution. A WHR above 0.90 in men and 0.85 in women is associated with increased health risk. By measuring WHR, clinicians and individuals can identify those who may benefit from lifestyle changes. This simple measurement is a valuable tool in preventive medicine and health promotion.
- Cardiovascular and metabolic risk screening
- Assessment of central obesity and visceral adiposity
- Monitoring of lifestyle interventions for weight loss
- Public health surveillance of obesity trends
- Clinical research on risk factor modification
Frequently Asked Questions
WHR is a simple ratio used to assess body fat distribution and associated health risk: WHR = waist circumference / hip circumference.
Waist: midway between the lowest rib and the iliac crest, at the navel level.
Hip: at the widest point over the buttocks.
- Men: < 0.9 low risk, 0.9–0.99 moderate, ≥ 1.0 high
- Women: < 0.8 low, 0.8–0.84 moderate, ≥ 0.85 high
It reflects central obesity (belly fat), which is more metabolically active and linked to insulin resistance, whereas BMI does not distinguish fat distribution.
A woman has waist = 80 cm, hip = 100 cm. WHR = 0.8, which is in the low‑risk category.
- Measurement variability can be high if landmarks are not consistent.
- It does not account for overall weight or muscle mass.
- Measuring waist and hip at inconsistent landmarks, making the ratio unreliable for tracking changes.
- Using a single measurement without considering other risk factors.
Waist circumference is a simpler measure; WHR adds the hip measurement, which can differentiate between apple‑shaped and pear‑shaped body types.
Higher WHR is strongly associated with increased risk of type 2 diabetes and metabolic syndrome.
Through weight loss, particularly reducing visceral fat via diet and exercise.