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Waist-to-Height Ratio CalculatorHow it works
Waist-to-height ratio (WHtR) is one of the simplest and most evidence-backed metabolic health screening tools available. The rule is memorable: keep your waist circumference below half your height. A WHtR below 0.5 at any age is associated with substantially lower cardiovascular risk, type 2 diabetes risk, and all-cause mortality compared to a WHtR above 0.5.
Formula: WHtR = waist circumference ÷ height (same unit — both cm or both inches)
Risk categories: - Below 0.40: Extremely lean (may indicate underweight) - 0.40–0.50: Healthy (low cardiometabolic risk) - 0.50–0.60: Increased risk (visceral fat accumulation beginning) - Above 0.60: High risk (strongly associated with metabolic syndrome)
Why WHtR is better than BMI for metabolic health: WHtR measures central adiposity — the accumulation of visceral fat around abdominal organs — which is the metabolically active, health-relevant fat depot. BMI measures total mass without distinguishing fat distribution. A systematic review by Ashwell, Gunn & Gibson (2012) found WHtR consistently outperformed BMI and waist circumference alone for predicting cardiometabolic risk factors including hypertension, dyslipidaemia, and insulin resistance.
"Keep your waist to less than half your height" applies across age groups and is one of the most scalable public health messages for cardiometabolic risk reduction.
Privacy: all calculations run in the browser. No health data is transmitted.
Frequently Asked Questions
- For cardiometabolic risk (heart disease, type 2 diabetes, metabolic syndrome), multiple systematic reviews conclude that WHtR outperforms BMI as a screening tool. A 2012 meta-analysis of 300,000+ individuals across 31 ethnicities by Ashwell, Gunn & Gibson found WHtR consistently better than BMI and waist circumference alone for predicting hypertension, dyslipidaemia, diabetes, and cardiovascular events. The key advantage: WHtR directly measures central adiposity (visceral fat) which is the metabolically dangerous fat type, whereas BMI measures total mass without fat distribution.
- The absolute waist circumference risk thresholds from the WHO: increased risk — women above 80cm (31.5in), men above 94cm (37in). High risk — women above 88cm (34.6in), men above 102cm (40in). However, the WHtR threshold of 0.5 is more universally applicable because it adjusts for height. A 190cm man with an 88cm waist (WHtR 0.46) is at lower risk than a 155cm woman with the same 88cm waist (WHtR 0.57) — the absolute threshold incorrectly classifies these cases equally.
- Yes. Visceral fat (the primary driver of WHR and WHtR) is highly responsive to aerobic exercise — more so than subcutaneous fat. Consistent aerobic exercise (150+ minutes per week of moderate-to-vigorous intensity) reduces visceral fat even without significant total weight loss. A 2017 meta-analysis found that exercise reduced visceral fat by 6.1% on average compared to no exercise, with minimal differences between exercise modalities. Combined aerobic and resistance training is more effective than either alone.
- Yes — research suggests the WHtR threshold of 0.5 applies reasonably well to children and adolescents. A 2010 systematic review found WHtR was a better predictor of cardiovascular risk factors in children than BMI-for-age percentile. The boundary between healthy and at-risk WHtR in children and adolescents appears to be approximately 0.46–0.50, similar to adults. However, WHtR norms for children have been less extensively validated than adult norms — use alongside BMI-for-age percentile assessment and paediatric guidance.