BMI and Waist Size for South Asians: Lower Cut-offs Explained
A BMI of 24 gets a “healthy” label on most online calculators. For many people of Pakistani, Indian or Bangladeshi background, that same 24 already sits in the range where health risks start to climb. This guide explains BMI and waist size for South Asians, how to measure at home properly, and what those numbers can and can’t tell you.
Quick facts
- Standard BMI overweight: 25 and above
- Asian guidance, overweight (increased risk): from about 23
- Asian guidance, obesity (high risk): from about 27.5
- Waist cut-offs commonly used for South Asians: about 90 cm for men, 80 cm for women
- Useful extra check: waist less than half your height
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BMI and waist size for South Asians: why the cut-offs are lower
BMI (body mass index) is just weight divided by height squared, and the standard categories behind it were built mostly from data on European populations, which is where the trouble starts. When researchers looked at Asian populations, they found that type 2 diabetes, high blood pressure and heart disease tended to appear at lower BMIs.
A big part of the reason is where the body stores fat. At the same BMI, many South Asians carry more fat around the abdomen and internal organs and less muscle than people of European background. That inner abdominal fat carries the strongest link to insulin resistance. It’s why you’ll meet slim-looking relatives with a “pot” belly and a diabetes diagnosis. That pattern isn’t rare.
So WHO guidance for Asian populations suggested extra action points: risk rising from a BMI of about 23, and higher risk from about 27.5. Many Asian guidelines call these the overweight and obesity thresholds. Several countries and health bodies use these for South Asian patients. They’re guidance for thinking about risk, not a diagnosis.
| BMI | Standard label | South Asian guidance |
|---|---|---|
| Under 18.5 | Underweight | Underweight |
| 18.5 to 22.9 | Healthy | Lower risk |
| 23 to 24.9 | Healthy | Increased risk |
| 25 to 27.4 | Overweight | Increased risk |
| 27.5 and above | Overweight or obese | High risk |
How to work out your BMI
- Weigh yourself in the morning, after the toilet, in light clothes. Write the number in kg.
- Measure height without shoes, heels against a wall, looking straight ahead. Convert to metres (165 cm = 1.65 m).
- Multiply height by itself: 1.65 × 1.65 = 2.72.
- Divide weight by that: 68 kg ÷ 2.72 = 25.0.
In this example, a standard calculator calls 25 the edge of overweight. Under South Asian guidance, it’s already well into the increased-risk band. Nothing is wrong with the person. It’s just a signal to pay attention.
How to measure waist correctly at home
Most people measure in the wrong spot, at the trouser line or around the belly button while holding their breath, and either habit is enough to make the number useless for comparing one month with the next. Here’s the method used in health checks.
- Use a soft cloth tape, the kind in every silai box. Check it against a ruler; old tapes stretch.
- Stand straight, feet about 20 to 30 cm apart, over bare skin or one thin layer.
- Find the bottom of your lowest rib with your fingers, at your side. Then feel for the top of the hip bone beneath it.
- Place the tape midway between those two points, all the way around. For many people that lands near the navel, though not always exactly there.
- Hold the tape flat and even the whole way round (a mirror helps, or ask someone), snug but never pressing into skin.
- Breathe out normally and read the tape at the end of that breath. Don’t suck in.
- Measure twice. If the readings differ by more than 1 cm, measure a third time and use the average of the closest two.
The string check
Cut a piece of string equal to your height. Fold it in half. If the folded string doesn’t reach around your waist (measured as above), your waist is less than half your height, a simple sign often used as a lower-risk marker. No numbers needed.
What the numbers mean
Waist
For South Asians, cut-offs commonly used are about 90 cm (35.5 inches) for men and about 80 cm (31.5 inches) for women. Above these, abdominal fat is more likely to be affecting blood sugar, blood pressure and cholesterol. Some guidelines use a waist-to-height ratio of 0.5 and above as a sign of increased risk, and 0.6 and above as high.
BMI and waist together
The two work best side by side. A BMI of 22 with a waist of 94 cm in a man tells a different story from a BMI of 26 with a waist of 84 cm in a man who lifts weights. For men past 40, that waist figure is the one to watch. The first person may be at higher metabolic risk despite the “normal” BMI.
What the numbers don’t mean
- They aren’t a diagnosis. Only blood tests (such as HbA1c or fasting glucose), blood pressure readings and a doctor’s assessment can tell you whether you have diabetes, hypertension or high cholesterol.
- BMI can’t see muscle. Athletes, labourers and gym-goers may score high without much fat; waist size helps here.
- BMI isn’t for children. Children and teens need age-and-sex growth charts, read by a health professional.
- Pregnancy changes everything. Don’t use BMI or waist measures to judge weight during pregnancy.
- Older adults lose height and muscle, so BMI can underestimate fat; very low weight is also a concern in later life.
- They say nothing about your worth. They’re tools for health decisions, nothing more.
Book a check-up if your waist is above about 90 cm (men) or 80 cm (women), your BMI is 23 or higher with a family history of diabetes or early heart disease, or you’ve had gestational diabetes or PCOS. Ask for blood sugar, blood pressure and cholesterol checks. See a doctor promptly if you notice constant thirst, passing urine often, blurred vision, slow-healing wounds, or weight loss you didn’t try for. If you already take diabetes medicine (particularly insulin or sulfonylureas), blood pressure tablets, or have kidney or thyroid disease, discuss any weight-loss plan before starting. Weight-loss dieting isn’t for pregnancy, breastfeeding, children or teenagers, or anyone with an eating disorder history. Medicines and surgery for weight exist, but they are strictly a decision to make with your doctor.
Unani physicians described body types through temperament (mizaj), and noted that heaviness around the belly was a sign of an imbalance in eating and activity, not just size. Classical texts weren’t measuring centimetres, and their theories aren’t modern medicine, but the idea that belly fat deserves attention separate from overall size lines up neatly with what waist measures tell us now.
If your numbers are high, where to begin
You don’t need a dramatic change. For many people a loss of even a few kilos, with a waist that shrinks a few centimetres, is worth having. Start with a realistic pace: our 5 kg in 10 to 12 weeks plan uses home food and checkpoints that include your waist. The 7-day Pakistani diet plan gives a measured menu. Walk after meals. Keep roti and chawal, but count them. For fibre-rich meals, masoor daal and dalia are easy staples. Find the rest in Desi Weight Loss.
Re-measure your waist every 2 to 4 weeks, same method, same time of day.
Asian BMI and waist cut-offs explained simply
What is a healthy BMI for Pakistanis and Indians?
Asian guidance generally counts about 18.5 to 22.9 as the lower-risk range, with risk rising from about 23 and higher risk from about 27.5. It’s a guide for thinking about risk, and your doctor may weigh other factors too.
Why is the BMI cut-off lower for South Asians?
At the same BMI, many South Asians carry more fat around the abdomen and organs and less muscle than people of European background. Type 2 diabetes, high BP and heart disease tend to appear at lower BMIs, which is why WHO guidance for Asian populations set extra action points.
What waist size is too big for a South Asian woman?
The commonly used cut-off is about 80 cm (31.5 inches). Above that, it’s worth asking for blood sugar, blood pressure and cholesterol checks.
What waist size is too big for a South Asian man?
About 90 cm (35.5 inches) is the figure commonly used for South Asian men. For men past 40 especially, that waist number is often more telling than BMI.
Where exactly should I measure my waist?
Midway between your lowest rib and the top of your hip bone, with the tape level all round, at the end of a normal breath out. It’s not the trouser waistband, and don’t suck in. Measure twice and average if they differ by more than 1 cm.
My BMI is normal but my waist is large. Should I worry?
It deserves attention. A large waist with a normal BMI can still mean higher metabolic risk, especially for South Asians, because inner belly fat is most linked with insulin resistance. Ask your doctor about basic blood tests.
Is waist-to-height ratio better than BMI?
It’s a simple, useful extra check because it reflects belly fat. A ratio of 0.5 and above is often read as increased risk, and 0.6 and above as high. Most doctors use it alongside BMI and blood tests rather than instead of them.
Can BMI tell me if I have diabetes?
No. BMI and waist size only point to risk. Diabetes is diagnosed with blood tests such as fasting glucose (126 mg/dL or more) or HbA1c (6.5% or more), read by a doctor. Constant thirst, frequent urination or blurred vision are reasons to get tested promptly.
Does BMI work if I lift weights or do labour work?
Not well. BMI can’t tell muscle from fat, so athletes, labourers and gym-goers may score high without much fat. A waist measurement helps sort that out.
Can I use BMI for my child?
Not with adult cut-offs. Children and teens need age-and-sex growth charts read by a health professional, and weight worries in children should go to a doctor, with the whole family’s habits changing rather than a diet.
Should I use BMI during pregnancy or in old age?
Don’t use BMI or waist size to judge weight during pregnancy. In older adults, height and muscle loss mean BMI can underestimate fat, and very low weight is a worry of its own, so a doctor’s assessment matters more.