WHO vs South Asian vs East Asian BMI Standards Explained

Why Are There Multiple BMI Standards?

The WHO's original BMI thresholds were developed from data collected largely in European-origin populations. As research expanded globally, scientists found that the same BMI value carried different levels of metabolic risk depending on ethnicity. Two people with a BMI of 24 — one European, one South Asian — do not have the same health risk profile.

This is not a political or cultural distinction. It is a physiological one, rooted in differences in body composition, fat distribution, and genetic predisposition to insulin resistance. In response, three distinct evidence-based standards have emerged.

Side-by-Side Comparison

WHO International Standard

The WHO global standard defines overweight as BMI ≥ 25 and obese as BMI ≥ 30. These cut-offs were established from large epidemiological studies — mainly in North America and Europe — linking BMI to mortality, cardiovascular disease, and type 2 diabetes.

Use this if: you are of European, African, or Latin American descent, or when comparing results on international health surveys.

South Asian / Indian Standard

In 2004, a WHO Expert Consultation published in The Lancet proposed lower action points for Asian populations. For South Asians — including Indians, Pakistanis, Bangladeshis, and Sri Lankans — overweight begins at BMI 23 and obesity at BMI 27.5.

The basis for these lower thresholds:

• South Asians carry 3–5% more body fat at the same BMI as Europeans
• Visceral fat (the metabolically dangerous kind) accumulates faster at lower BMI values
• Type 2 diabetes risk rises sharply at BMI 22–23 in South Asians — well below the WHO 25 threshold
• The ICMR adopted these thresholds in its Indian-specific guidelines

Use this if: you are of South Asian origin — Indian, Pakistani, Bangladeshi, Sri Lankan, or Nepali.

East Asian Standard

China's National Standard (GB/T 2003) and the WHO Western Pacific Regional Office (WPRO) define overweight as BMI ≥ 24 and obesity as BMI ≥ 28. This standard sits between WHO global and South Asian thresholds.

Research in Chinese, Japanese, and Korean populations shows increased metabolic risk beginning at lower BMI values than in Europeans — but the magnitude of the shift is somewhat less pronounced than in South Asians. Japan's JASSO classifies obesity at BMI ≥ 25, though the Chinese standard (≥ 28) is most widely used regionally.

Use this if: you are of Chinese, Japanese, Korean, or Southeast Asian origin.

What This Means in Practice

Consider a person who is 170 cm tall and weighs 75 kg. Their BMI is 26.0. Here is how each standard categorises them:

The same number, three different clinical interpretations. For an Indian adult, this is not a minor distinction — it determines whether a doctor should investigate for insulin resistance and cardiovascular risk factors.

Which Standard Should You Use?

• European / African / Latin American origin: WHO International
• Indian / Pakistani / Bangladeshi / Sri Lankan / Nepali: South Asian
• Chinese / Japanese / Korean / Southeast Asian: East Asian
• Mixed ethnicity or uncertain: use WHO as a baseline, then check against Asian thresholds and discuss with your doctor

Our BMI calculator lets you switch between all three standards instantly — try entering the same values under each to see how the classification changes.