BMI Calculator: WHO and Asian-Indian Categories
Enter your weight and height to get your BMI, how it is classed under WHO and Asian-Indian cut-offs, and the weight range that counts as normal for your height.
Your results
Estimates for healthy adults, for education only. Not a medical assessment. Built and reviewed by Umair Hazrami.
How this calculator works
BMI is weight divided by height squared:
BMI = weight (kg) ÷ height (m)²
A person who is 170 cm and 75 kg has a BMI of 75 ÷ (1.70 × 1.70) = 26.0. The result is then sorted into two sets of categories side by side.
| Category | WHO (international) | Asian-Indian |
|---|---|---|
| Underweight | below 18.5 | below 18.5 |
| Normal | 18.5-24.9 | 18.5-22.9 |
| Overweight | 25-29.9 | 23-24.9 |
| Obese | 30 and above | 25 and above |
That same 75 kg person is “overweight” on the WHO scale and “obese” on the Asian-Indian one. Same body, two labels. The healthy weight range shown is just the Asian-Indian normal band (18.5-22.9) worked backwards for your height.
Why we show Asian-Indian cut-offs
The link between BMI, body fat and disease risk is not the same in every population. A 2004 WHO expert consultation reviewed evidence that Asian populations differ from European ones here, and concluded that many Asian people already face high diabetes and heart disease risk below a BMI of 25, with the risk point varying between 22 and 25 depending on the population (WHO Expert Consultation, 2004). It kept the international scale but named 23 as an extra point for public health action.
Indian experts went further. The 2009 consensus statement notes that Asian Indians tend to carry more abdominal and ectopic fat, and sets narrower, lower normal BMI limits than for white Caucasians (Misra et al., 2009). The authors estimated this would label an additional 10-15% of the Indian population as overweight or obese. That is why the calculator’s colour verdict is based on the Asian-Indian category.
If you are of South Asian origin and live abroad, the Asian-Indian row is still the more relevant one for you.
How to use your result
Treat BMI as a first filter, not a verdict.
- Normal on both scales? Good start. Still check your waist, because BMI can miss excess fat.
- Overweight only on the Asian-Indian scale? That is the early-warning zone. Small changes in food and activity now are easier than bigger ones later. The calorie calculator can set a modest deficit.
- Underweight? If you are losing weight without trying, or feel unwell, see a doctor rather than just eating more.
- Obese on either scale? Book a routine check-up for blood pressure, blood sugar and lipids. Those numbers matter more than BMI itself.
Limitations and who it is not for
BMI cannot tell muscle from fat. A classic mix-up is a lifter with years of training panicking over an “obese” reading. On the flip side, a meta-analysis found that standard BMI obesity cut-offs had a pooled sensitivity of only 0.50 for spotting excess body fat, missing about half of people who had it (Okorodudu et al., 2010).
So pair BMI with something that sees fat distribution. Waist-to-height ratio beat both BMI and waist circumference at flagging cardiometabolic risk in a meta-analysis of over 300,000 adults, though the edge over BMI was modest, about 4-5% better discrimination (Ashwell et al., 2012). Run yours through the waist-to-height ratio calculator, or estimate body fat with the body fat calculator. Our guide to body fat measurement methods explains what each one can and cannot tell you.
This calculator is for non-pregnant adults. Children and teens need age- and sex-specific growth charts, and older adults, pregnant women and people with conditions that affect fluid or muscle mass should have weight-related risk judged by a doctor rather than a BMI chart.
Frequently Asked Questions
What is a healthy BMI for Indians?
Under the Asian-Indian cut-offs this calculator uses, 18.5-22.9 is classed as normal, 23-24.9 as overweight, and 25 or above as obese. Indian consensus guidelines set lower, narrower normal limits than the WHO because Asian Indians tend to carry more body fat and abdominal fat at the same BMI. So a BMI of 24 that looks fine on a WHO chart is already flagged here. One detail: that consensus put the bottom of the normal band at 18.0, but this calculator keeps 18.5 as the underweight line on both scales.
Why are Asian BMI cut-offs lower than WHO cut-offs?
A WHO expert consultation found that a substantial share of Asian people have a high risk of type 2 diabetes and heart disease at BMIs below 25. The point where risk starts to rise varied from 22 to 25 across different Asian populations. The WHO kept its international categories but suggested 23 as an extra action point, which is where the Asian-Indian 'overweight' band begins.
Is BMI accurate for people who lift weights?
Not very. BMI only knows your weight and height, so a muscular lifter can be classed as overweight or even obese with modest body fat. If you train hard and your waist is lean, a body fat estimate or waist-to-height ratio will tell you more than BMI.
Can a normal BMI still mean too much body fat?
Yes. A meta-analysis of studies covering about 32,000 people found that standard BMI obesity cut-offs missed roughly half of the people who had excess body fat when measured directly. This pattern, sometimes called normal-weight obesity, is one reason it is worth checking your waist as well.
What should I measure alongside BMI?
Waist-to-height ratio is the easiest add-on: measure your waist with a tape and divide it by your height. A meta-analysis of more than 300,000 adults found it picked out cardiometabolic risk better than BMI or waist circumference alone. Try the waist-to-height ratio calculator for a quick check.
How is the healthy weight range calculated?
The calculator takes your height in metres, squares it, and multiplies by 18.5 and 22.9, the edges of the Asian-Indian normal band. For someone 170 cm tall that gives about 53.5-66.2 kg. It is a range linked to lower average risk, not a target you must hit.
My BMI says obese. Should I see a doctor?
BMI is a screening number, not a diagnosis, but a high reading is a good reason for a routine check-up. A doctor can measure blood pressure, blood sugar and cholesterol, which tell you far more about your actual health. See one sooner if you also have symptoms such as unusual thirst, breathlessness or rapid unexplained weight change.
Sources & References
Every claim above is checked against peer-reviewed research (PubMed, U.S. National Library of Medicine) or guidance from established health bodies. How we fact-check.
- WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies. Lancet. 2004. PMID: 14726171
- Misra A, et al. Consensus statement for diagnosis of obesity, abdominal obesity and the metabolic syndrome for Asian Indians and recommendations for physical activity, medical and surgical management. J Assoc Physicians India. 2009. PMID: 19582986
- Okorodudu DO, et al. Diagnostic performance of body mass index to identify obesity as defined by body adiposity: a systematic review and meta-analysis. Int J Obes. 2010. PMID: 20125098
- Ashwell M, et al. Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors: systematic review and meta-analysis. Obes Rev. 2012. PMID: 22106927