BMI Calculator for Singapore
Singapore skips the 25 line entirely
Under Health Promotion Board (HPB), Ministry of Health's scale, Singapore uses a normal range of BMI 18.5 – 22.9, overweight from 23.0 and obesity from 27.5.
Asian BMI Calculator
Measure at the midpoint between your lowest rib and the top of your hip bone, on a normal breath out. Needed to assess central obesity and waist-to-height ratio.
This calculator covers 11 published standards: WHO international, the WHO 2004 Asian action points, WHO Asia-Pacific, China's WS/T 428, Hong Kong Department of Health, Singapore HPB, Japan JASSO, Korea KSSO, the Misra Indian consensus and ADA 2026. BMI is a screening tool, not a diagnosis.
Singapore BMI classification
| BMI range | Classification |
|---|---|
| < 18.5 | Underweight — risk of nutritional deficiency |
| 18.5 – < 23 | Low risk (healthy range) |
| 23 – < 27.5 | Moderate risk |
| ≥ 27.5 | High risk |
Source: Health Promotion Board — National Healthy Lifestyle Campaign: Know Your BMI, Know Your Risk · HealthHub (HPB) — BMI and weight management(HPB Asian cut-off points, revised 2005 and in current use)
Why Singapore's cut-points look the way they do
Singapore's Health Promotion Board does not use 25 for anything. Its scale runs 18.5–22.9 (low risk), 23.0–27.4 (moderate risk) and 27.5 and above (high risk) — a three-band risk ladder with a wide middle.
That wide 23.0–27.4 middle band is what makes Singapore unusual. Where China, Korea and Hong Kong all place an obesity line inside that range, Singapore keeps it as a single "moderate risk" tier and only escalates at 27.5 — the WHO 2004 high-risk action point.
The HPB also frames the output as risk rather than weight status. The published categories are literally Low risk, Moderate risk and High risk, with the underweight band described as a risk of nutritional deficiency diseases and osteoporosis.
Key points
- Healthy range 18.5–22.9; no obesity line at 25 — the middle tier runs all the way to 27.4.
- 27.5 is the escalation point, matching the WHO 2004 high-risk action point exactly.
- Waist circumference ≥90 cm (men) / ≥80 cm (women) is used as an independent risk flag.
- Widely cited alongside the Healthier SG and Screen for Life programmes for national risk screening.
How Singapore compares
| Compared with | Overweight threshold | Obesity threshold |
|---|---|---|
| WHO international (global) 25 / 30 | 2.0 points lower | 2.5 points lower |
| WHO Asia-Pacific (WPRO / IASO / IOTF) 23 / 25 | same | 2.5 points higher |
A BMI of 27.5 is classified as High risk in Singapore (High risk). The same value reads differently on the WHO international scale — which is why the scale has to be named.
Waist circumference and central obesity
A waist of 90 cm or more (men) or 80 cm or more (women) signals raised risk even when BMI looks acceptable.
Waist matters because BMI cannot see where fat sits. Two people with the same BMI can have very different visceral fat, and visceral fat is the component most strongly linked to type 2 diabetes and cardiovascular disease. The ethnicity-independent screen is waist-to-height ratio: keep your waist below half your height.
All standards side by side
| Standard | Normal range | Overweight from | Obesity from | Waist / central obesity | Source |
|---|---|---|---|---|---|
| WHO international (global)World Health Organization | 18.5 – 24.9 | 25.0 | 30.0 | — | Primary source |
| WHO Expert Consultation 2004 (Asian populations)World Health Organization expert consultation, published in The Lancet | 18.5 – 22.9 | 23.0 | 27.5 | — | Primary source |
| WHO Asia-Pacific (WPRO / IASO / IOTF)WHO Western Pacific Regional Office, International Association for the Study of Obesity, International Obesity Task Force | 18.5 – 22.9 | 23.0 | 25.0 | — | Primary source |
| ChinaNational Health Commission of the PRC — health industry standard WS/T 428 | 18.5 – 23.9 | 24.0 | 28.0 | M ≥90cm / W ≥85cm | Primary source |
| Hong Kong, ChinaDepartment of Health, Centre for Health Protection — adopting the WHO Western Pacific Regional Office classification for Asian adults | 18.5 – < 23.0 | 23.0 | 25.0 | WHtR < 0.5 | Primary source |
| SingaporeHealth Promotion Board (HPB), Ministry of Health | 18.5 – 22.9 | 23.0 | 27.5 | M ≥90cm / W ≥80cm | Primary source |
| JapanJapan Society for the Study of Obesity (JASSO) | 18.5 – 24.9 | — | 25.0 | M ≥85cm / W ≥90cm | Primary source |
| South KoreaKorean Society for the Study of Obesity (KSSO) | 18.5 – 22.9 | 23.0 | 25.0 | M ≥90cm / W ≥85cm | Primary source |
| India and South AsiaConsensus statement for Asian Indians (Misra et al., JAPI 2009); Indian Council of Medical Research | 18.0 – 22.9 | 23.0 | 25.0 | M ≥90cm / W ≥80cm | Primary source |
| UK NICE guidance — Asian, Chinese, Middle Eastern and Black African/Caribbean adultsNational Institute for Health and Care Excellence (UK), guideline NG246 | 18.5 – 22.9 | 23.0 | 27.5 | WHtR < 0.5 | Primary source |
| ADA 2026 standard for Asian populationsAmerican Diabetes Association — Standards of Care in Diabetes 2026, adult overweight and obesity | 18.5 – 22.9 | 23.0 | 27.5 | M ≥90cm / W ≥80cm | Primary source |
All 11 standards shown, each read from the issuing authority's own document (linked per row). The WHO 2004 figures of 23.0 / 27.5 are public-health action points, not a redefinition of the international categories.
Frequently asked questions
- Why does Singapore not use 25 as its overweight threshold?
- Because the HPB frames the output as health risk, not weight status. Its published ladder goes low risk (18.5–22.9) → moderate risk (23.0–27.4) → high risk (≥27.5), so there is no separate "overweight/obese" boundary to place at 25.
- My BMI is 26 in Singapore — what does that mean?
- You are in the moderate risk band (23.0–27.4). That is the band where Singapore clinics most often check blood pressure, fasting glucose and lipids. It is not "obese" on the HPB scale, but it is above the healthy range and it is actionable.
- Is BMI 27.5 obese in Singapore?
- The HPB classifies 27.5 and above as high risk, and the same number is used as the obesity cut-off in Singapore health writing. It is also exactly the WHO 2004 high-risk action point — the numbers line up rather than being coincidental.
Data sources and how we verify them
Every cut-point, band and formula on this page is taken from the issuing authority's own document, listed below. We do not use second-hand summaries, and we do not fill gaps with numbers no source states.
- World Health Organization (WHO)
International cut-points (25 / 30) and the 2004 Asian action points
- National Health Commission of the PRC
China's current adult cut-points — WS/T 428 (24 / 28) and waist criteria
- Department of Health, Hong Kong, China
Hong Kong classification (23 / 25), from the Population Health Survey 2020-22
- Health Promotion Board, Singapore
Singapore's three-band risk ladder (18.5–22.9 / 23.0–27.4 / ≥27.5)
- Japan Society for the Study of Obesity (JASSO)
Japan's classification, which has no overweight tier (obesity from 25)
- Korean Society for the Study of Obesity (KSSO)
Korea's classification and abdominal-obesity waist thresholds
- Indian Council of Medical Research / Misra consensus
South Asian cut-points, including the 18.0 lower bound
- National Institute for Health and Care Excellence (NICE), UK
Lower ethnic-specific thresholds for Asian adults in the UK (23 / 27.5)
- American Diabetes Association (ADA)
2026 standards — Asian obesity at 27.5 and central obesity overriding BMI
Cut-points are population-level statistical thresholds, not individual diagnoses. If your value sits near a category line, measure your waist as well and read it alongside body-fat percentage. Last checked: 2026-09-15.
Sources
- Health Promotion Board — National Healthy Lifestyle Campaign: Know Your BMI, Know Your Risk
- HealthHub (HPB) — BMI and weight management
Every figure above was checked against the original document. This page is general information, not medical advice.
Other countries and regions
Health Information Disclaimer
Content on this site is for general information only and does not constitute medical advice. Consult a doctor or qualified health professional for personal health concerns. Last updated: August 9, 2026.
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Standard documented on this page: Health Promotion Board (HPB), Ministry of Health — HPB Asian cut-off points, revised 2005 and in current use. This site documents 11 published standards; figures are read from each authority's own document.