Waist-to-Height Ratio Calculator
Waist divided by height. Below 0.5 is the target — the only measure on this site that needs no sex-, age- or ethnicity-specific cut-points.
Keep your waist under half your height — a ratio below 0.5. UK NICE guideline NG246 (2022) classifies 0.4–0.49 as healthy central adiposity, 0.5–0.59 as increased and 0.6 or above as high, and states the classification applies to both sexes, all ethnicities and people with a BMI under 35. The ADA 2026 adult obesity standards go further: a ratio of 0.5 or more can trigger an obesity classification on its own, regardless of BMI.
Waist-to-Height Ratio Calculator
Measure your waist at the midpoint between your lowest rib and the top of your hip bone. Keep the tape horizontal, breathe out normally, and do not pull it tight.
Bands follow NICE guideline NG246 (2022), recommendation 1.9.14. The ADA 2026 adult obesity standards separately treat a ratio of 0.5 or more as central obesity sufficient to trigger an obesity classification on its own.
The NICE waist-to-height ratio bands
| Waist-to-height ratio | Central adiposity | What to do |
|---|---|---|
| 0 – 0.4 | Below the healthy range | A very low waist-to-height ratio. Check that the measurement is right, and discuss unintentional weight loss with a clinician. |
| 0.4 – 0.5 | Healthy central adiposity | No increased health risk from central adiposity. Keep it here. |
| 0.5 – 0.6 | Increased central adiposity | Increased health risk. This is the band where NICE says to take care — waist reduction has the highest return here. |
| ≥ 0.6 | High central adiposity | Further increased health risk. NICE says to take action; ask your clinician about glucose, blood pressure and lipids. |
Source: NICE guideline NG246, recommendation 1.9.14. Note: at a BMI of 35 or above, waist measurement adds little predictive power and NICE does not recommend this classification for that group.
Why waist-to-height ratio matters more than BMI for Asian populations
BMI is calculated from two numbers — height and weight — so it cannot distinguish muscle from fat, and it cannot see where fat is stored. Both limitations bite harder in Asian populations: at the same BMI, people of Asian descent carry a higher proportion of body fat, and more of it viscerally rather than under the skin.
The ADA quantified this in its 2026 adult obesity standards: BMI's sensitivity for detecting obesity is roughly 50%, with specificity around 90%. In plain terms, about half of the people who have obesity are missed by BMI alone. The guideline names Asian populations and older adults as the groups where BMI most often understates body fat.
Waist-to-height ratio does one thing BMI does not: it puts height in the denominator, which makes it scale naturally across body sizes. That is why it needs no ethnicity-, sex- or age-specific cut-points — the property a 2010 systematic review identified as its main advantage over other anthropometric indices.
The trade-off is that it only reflects central fat; it says nothing about whether your overall weight is too low. Read the two together: BMI for the whole picture, waist-to-height ratio for where the fat actually sits.
How to measure your waist correctly
- Measure at the midpoint between your lowest rib and the top of your hip bone. Do not measure at the waistband of your trousers — that sits lower than your actual waist.
- Measure against bare skin, or over a single thin layer. Thick clothing adds centimetres that are not there.
- Stand relaxed with your feet slightly apart and your weight evenly distributed.
- Read the tape at the end of a normal breath out. Do not hold your breath, and do not suck in.
- Keep the tape horizontal all the way round, parallel to the floor — no twisting, no slipping down at the back.
- Do not pull it tight. The tape should sit flat against the skin without compressing it. Measure twice and average; the two readings should agree within 1 cm.
BMI, waist circumference and waist-to-height ratio compared
| Measure | What it captures | Ethnicity-specific cut-points? | Main weakness |
|---|---|---|---|
| BMI | Overall weight relative to height | Yes — 2–5 points lower for Asian populations | Cannot separate muscle from fat or locate fat |
| Waist circumference | Central fat | Yes — 80–90 cm depending on the authority | Not comparable between tall and short people |
| Waist-to-height ratio | Central fat, normalised for body size | No — one threshold, 0.5 | Says nothing about overall underweight |
Official waist thresholds by country
Waist-to-height ratio is a universal threshold, but national health authorities still publish their own absolute waist figures. These come from their own documents — note that the female threshold ranges from 80 cm to 85 cm.
| Standard | Men | Women |
|---|---|---|
| ChinaNational Health Commission of the PRC — health industry standard WS/T 428 | ≥ 90 cm | ≥ 85 cm |
| SingaporeHealth Promotion Board (HPB), Ministry of Health | ≥ 90 cm | ≥ 80 cm |
| JapanJapan Society for the Study of Obesity (JASSO) | ≥ 85 cm | ≥ 90 cm |
| South KoreaKorean Society for the Study of Obesity (KSSO) | ≥ 90 cm | ≥ 85 cm |
| India and South AsiaConsensus statement for Asian Indians (Misra et al., JAPI 2009); Indian Council of Medical Research | ≥ 90 cm | ≥ 80 cm |
| ADA 2026 standard for Asian populationsAmerican Diabetes Association — Standards of Care in Diabetes 2026, adult overweight and obesity | ≥ 90 cm | ≥ 80 cm |
| Waist-to-height ratio (NICE / ADA)Ethnicity- and sex-independent | < 0.5 (waist under half your height) | |
Common mistakes
- Measuring at the trouser waistband. For most people that sits 2–5 cm below the anatomical waist and understates the result.
- Sucking in or holding your breath. This depresses the reading and makes repeat measurements unstable.
- Applying one waist number to every height. A 90 cm waist on a 190 cm frame and on a 155 cm frame are not the same thing — which is exactly the problem waist-to-height ratio solves.
- Stopping at a normal BMI. A BMI of 22 with an 88 cm waist is normal-weight central obesity, and it is common in Asian populations.
- Using adult thresholds on children. NICE suggests 0.5 applies to children aged 5 and over as well, but paediatric assessment should still lead with age- and sex-specific percentiles.
- Using it during pregnancy. Waist circumference changes with the uterus and amniotic fluid; adult central-adiposity classifications do not apply.
Frequently asked questions
- What is a healthy waist-to-height ratio?
- Keep your waist below half your height — a waist-to-height ratio under 0.5. That single number applies across populations, unlike BMI cut-points which differ between Asian and non-Asian adults.
- Why does waist-to-height ratio matter more than BMI for Asian people?
- Because BMI cannot tell muscle from fat or show where fat sits. At the same BMI, people of Asian descent tend to carry more of their fat viscerally, around the abdominal organs — the pattern most strongly linked to type 2 diabetes and cardiovascular disease.
- How do I measure my waist correctly?
- Measure directly against the skin or over light clothing, standing relaxed and breathing out normally. Place the tape at the midpoint between the lowest rib and the top of the hip bone, keep it horizontal, and do not pull it tight or hold your breath.
- My BMI is normal but my waist-to-height ratio is 0.55. Which matters?
- Take the waist-to-height ratio seriously. The ADA 2026 adult obesity standards treat a waist-to-height ratio of 0.5 or more as evidence of central obesity that can upgrade the classification even when BMI sits in the 23.0–27.4 band.
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
- NICE guideline NG246 — Identifying and assessing overweight, obesity and central adiposity (1.9.11–1.9.15)
- ADA Standards of Care in Diabetes 2026 — adult overweight and obesity (WHtR ≥0.5)
- WHO Expert Consultation — Appropriate body-mass index for Asian populations (Lancet 2004)
- KSSO — Diagnosis of Obesity, 2022 update (abdominal obesity: waist ≥90 cm men / ≥85 cm women)
- Misra et al. — Consensus Statement for Asian Indians (JAPI 2009; waist ≥90 cm men / ≥80 cm women)
Every figure above was checked against the original document. This page is general information, not medical advice.
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.
We do not keep your information. Height, weight, waist and age are calculated entirely in your browser — nothing is uploaded to our servers, logged or stored, and the numbers are gone as soon as you close or refresh the page. We measure anonymous traffic only, never the values you type. Full detail in our Privacy Policy.