Waist-Hip Ratio Calculator

Waist-hip ratio (WHR) is a simple screening measure of fat distribution — where you carry your body fat. It divides your waist circumference by your hip circumference. Values above 0.9 (men) or 0.85 (women) indicate central adiposity, which carries much higher cardiovascular and metabolic disease risk than the same amount of fat carried on the hips or thighs.

WHR became clinically important in the 1990s when large epidemiological studies (Interheart 2005, Framingham cohort) showed that WHR predicts heart disease risk BETTER than BMI in most populations. Two people with identical BMI can have very different WHR — and very different disease risk.

Consistent measurement matters more than exact anatomy — small errors in measurement location can shift WHR by 0.05 or more. WHO recommends: waist measured at the midpoint between the lowest rib and the top of the iliac crest (the bony point on the top of your hip); hip measured at the widest point around the buttocks.

Measure at end-normal-exhale (not holding breath, not deep inhale). Wear only underwear or light clothing. Use a flexible non-stretch tape measure held snug against the skin without compressing. Take two measurements at each location and use the average.

For consistency over time, measure at the same time of day (morning after voiding is standard) and always by the same method. A 0.1 WHR change over months is significant; a 0.02 change is likely measurement noise.

The WHO Expert Consultation on obesity uses these thresholds:

Waist circumference alone (WC) is now often preferred over WHR because it is a simpler measurement and hip changes can artifically improve WHR in overweight populations. WHO uses WC >102 cm (40 in) for men and >88 cm (35 in) for women as high-risk cutoffs.

BMI remains the standard first-pass screen because it is easiest to measure. WHR (or WC) adds critical fat-distribution information that BMI misses entirely. A comprehensive assessment uses both — BMI to classify size, WHR/WC to classify distribution.

The clinical rule: if BMI is normal but WHR is high, still assess metabolic risk (blood pressure, fasting glucose, lipids). If BMI is high but WHR is low ("pear shape"), disease risk is meaningfully lower than the BMI alone suggests.

Visceral fat (the abdominal fat that drives high WHR) is the first fat lost during weight loss for most people. A 5-10%% body weight loss typically reduces waist circumference by 5-10 cm and can shift WHR from high-risk into moderate or even low-risk categories.

The interventions with the most direct effect on waist circumference: sustained aerobic exercise (150+ minutes/week moderate), resistance training preserving lean mass during weight loss, dietary approaches that reduce processed carbohydrates and added sugars (Mediterranean pattern, DASH diet), and adequate sleep (chronic sleep deprivation is independently associated with abdominal fat accumulation).

Spot reduction of abdominal fat through targeted abdominal exercises does NOT work — the abs get stronger but the overlying fat only reduces through overall energy balance. Any diet and exercise plan that produces sustained fat loss will preferentially reduce visceral fat and improve WHR.