Find your body mass index, its WHO category and the healthy weight range for your height, in metric or US units.
If you’re of South Asian, Chinese, Southeast Asian or Japanese heritage, the standard “healthy” BMI of 18.5–24.9 may not tell the whole story. A large body of research shows that health risks start at lower BMI levels in many Asian populations, and several health authorities have adjusted their guidance accordingly.
The research in brief
In 2004, a WHO expert consultation reviewed data from across Asia and found that, at the same BMI, many Asian populations have:
- a higher percentage of body fat
- more visceral (abdominal) fat
- a higher risk of type 2 diabetes and cardiovascular disease
Put simply, a South Asian adult with a BMI of 23 may carry a similar metabolic risk to a white European adult with a BMI of around 27–28.
Adjusted BMI ranges
WHO proposed additional “public health action points” for Asian populations, and several countries adopted lower cut-offs:
| Category | Standard (WHO) | Commonly used for Asian adults |
|---|---|---|
| Underweight | Below 18.5 | Below 18.5 |
| Healthy weight | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight / increased risk | 25.0 – 29.9 | 23.0 – 27.4 |
| Obesity / high risk | 30.0 and above | 27.5 and above |
Exact thresholds vary by country and guideline:
- India: overweight from 23, obesity from 25.
- UK (NICE): recommends using lower thresholds (23 and 27.5) for people of South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family background.
- Singapore and Hong Kong: use 23 and 27.5 as action points.
- Japan: defines obesity from 25.
What it means in practice
Take someone 165 cm tall:
| Standard cut-offs | Asian cut-offs | |
|---|---|---|
| Healthy weight | 50.4 – 67.8 kg | 50.4 – 62.4 kg |
| “Increased risk” starts at | 68.1 kg | 62.6 kg |
A person at 65 kg would be “healthy” by the standard chart but in the “increased risk” range by the adjusted one.
The BMI calculator shows standard WHO categories; if the adjusted thresholds apply to you, compare your number against the table above.
Waist size matters even more
Because the issue is mainly where fat is stored, waist measurements are especially useful:
- South Asian men: increased risk above 90 cm (35.5 in)
- South Asian women: increased risk above 80 cm (31.5 in)
- Waist-to-height ratio: keep it below 0.5 regardless of ethnicity
More on these measures in BMI Limitations: When Body Mass Index Misleads, and Better Alternatives.
Why the difference exists
Researchers point to a mix of factors: genetics, body composition (typically less muscle mass for the same weight), fat distribution, and possibly early-life nutrition. The “thin-fat” phenotype, a slim appearance with relatively high internal fat, is well documented in South Asian populations.
What you can do
- Know your numbers: BMI, waist circumference and, ideally, blood pressure and fasting blood sugar or HbA1c.
- Screen earlier. Some guidelines suggest diabetes screening from a younger age or lower BMI for people of South Asian heritage.
- Focus on waist reduction and activity. Resistance training builds muscle, which improves insulin sensitivity.
- Plan your energy intake with the calorie calculator, and read How Many Calories Should I Eat to Lose Weight? A Realistic Guide for a sustainable approach.
This guide is for general information. Speak to a healthcare professional about which thresholds apply to you.
Find your body mass index, its WHO category and the healthy weight range for your height, in metric or US units.