Waist-to-Height Ratio (WHtR) Calculator
A Simple, Powerful Predictor of Cardiometabolic Risk
What's your waist circumference?
How tall are you?
About the Waist-to-Height Ratio Calculator
The Waist-to-Height Ratio (WHtR) calculator divides your waist circumference by your height to produce a single number that strongly predicts cardiometabolic risk across different ages, sexes, and ethnicities. The simple threshold — 'keep your waist circumference to less than half your height' — has been validated in numerous large population studies as an effective rule of thumb for identifying individuals at elevated risk of cardiovascular disease, type 2 diabetes, hypertension, and metabolic syndrome. WHtR addresses a key limitation of waist circumference alone, which can be misleading when comparing people of different heights. A 100 cm waist is very different in context for a 160 cm person versus a 190 cm person. By expressing waist relative to height, WHtR provides a self-calibrating measure that is equally meaningful across heights, making it particularly useful in diverse populations. Research comparing WHtR to BMI, waist circumference alone, and other anthropometric indices consistently shows WHtR to be among the strongest predictors of cardiometabolic outcomes. Some researchers argue that WHtR should replace BMI as the primary screening tool in routine health checks, given its greater sensitivity to visceral fat accumulation regardless of total body size.
How your WHtR is Calculated
WHtR = Waist circumference ÷ Height. Both measurements must be in the same unit (both cm or both inches). Measure your waist at the midpoint between your lower rib and top of the hip bone, typically at or near the navel. Take the measurement at the end of a normal exhale without pulling in your abdomen. Categorization thresholds: WHtR < 0.40 may suggest underweight; 0.40–0.49 is healthy; 0.50–0.59 indicates increased risk; ≥ 0.60 indicates high risk. These thresholds are approximately sex-neutral and apply consistently across ethnicities, though some guidelines propose slightly tighter thresholds (< 0.50) for Asian populations given higher metabolic risk at lower WHtR values.
Frequently Asked Questions
A WHtR between 0.40 and 0.49 is generally considered healthy for both men and women. The widely cited guideline is to keep your WHtR below 0.50 — meaning your waist should be less than half your height. Values at or above 0.50 are associated with increasing cardiometabolic risk.
Waist circumference thresholds are fixed numbers (e.g., > 88 cm for women, > 102 cm for men per WHO) that do not account for height. A tall person with a 90 cm waist may have a different health risk than a shorter person with the same waist. WHtR adjusts for height, making it a fairer and more accurate predictor of risk across the full range of body sizes.
The same formula and thresholds are used for both men and women, which is one of WHtR's practical advantages. Unlike WHR, where different risk thresholds apply by sex, WHtR < 0.50 as a healthy target applies equally to both sexes. Some research suggests women may tolerate slightly higher WHtR values before metabolic risk increases significantly, but the 0.50 threshold is well-supported for both sexes in clinical practice.
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