🌍 WHO Standard 🇯🇵 Japan Metabolic Syndrome 🌏 IDF Asia-Pacific
Waist-to-Hip Ratio Calculator
WHR measures where your body stores fat — which is a better predictor of heart disease risk than BMI alone. Japan uses different abdominal obesity thresholds than the WHO global standard.
Quick Answer
Healthy WHR: Men <0.90, Women <0.80 (WHO). High risk: Men ≥1.0, Women >0.85. Japan uses absolute waist circumference instead: men ≥85 cm or women ≥90 cm = metabolic syndrome risk. This is part of Japan's mandatory annual health check (Tokutei Kenshin). Abdominal fat is more metabolically dangerous than fat stored in hips/thighs.
Measure at narrowest point, above belly button
Widest point of buttocks / hips
WHR Risk Thresholds by Country Standard
| Standard | Men (low risk) | Women (low risk) | Metric |
|---|---|---|---|
| 🌍 WHO Global | <0.90 | <0.80 | WHR ratio — primary international standard |
| 🇺🇸 USA — AHA / NIH | WHR <0.90; waist <102 cm | WHR <0.85; waist <88 cm | Both WHR and waist circumference used |
| 🇬🇧 UK — NHS / NICE | WHR <0.90; waist <94 cm | WHR <0.85; waist <80 cm | NHS uses WHO thresholds; waist also measured |
| 🇨🇦 Canada — Heart & Stroke | Waist <102 cm (DRI) | Waist <88 cm | Canada follows AHA/US cutoffs for waist circumference |
| 🇦🇺 Australia — Heart Foundation | Waist <94 cm (AU) | Waist <80 cm | Heart Foundation AU adopts lower European-aligned cutoffs |
| 🇯🇵 Japan — MHLW (Tokutei Kenshin) | Waist <85 cm | Waist <90 cm | Strictest major-country cutoff; mandatory annual screening |
| 🌏 IDF — Asian/Pacific | Waist <90 cm | Waist <80 cm | Ethnic-specific; applies to East/South Asian populations |
Frequently Asked Questions
Is WHR better than BMI? ▾
WHR is generally considered a better predictor of cardiovascular disease risk than BMI because it measures fat distribution, not just total weight. A 2015 study in The Lancet found WHR was a better predictor of heart attack risk than BMI across 52 countries. However, both metrics have limitations — body fat percentage or waist circumference alone are also useful clinical tools. The UK NHS, Canadian guidelines, and WHO all recommend measuring waist circumference in addition to BMI.
Why does Japan use different waist thresholds? ▾
Japan launched a national metabolic syndrome prevention program (Tokutei Kenshin) in 2008, requiring annual checkups for adults over 40. Japan uses waist circumference thresholds of ≥85 cm for men and ≥90 cm for women — lower than Western cutoffs — because Japanese people develop metabolic complications at lower levels of abdominal fat. This is part of the broader Asia-Pacific health framework that also uses lower BMI thresholds.