BMI Calculator
Calculate your Body Mass Index in seconds — with WHO categories and Asian-specific cutoffs.
health
Adjust the inputs below
Ready when you are
Adjust the inputs on the left to see your your bmi.
The number your doctor checks in seconds
Walk into almost any clinic in India and the first thing the nurse does, after weight and height, is a quick mental BMI. It's a fast screen. One number that hints whether your weight sits in a healthy range for your frame, or whether it might be worth a closer look.
BMI stands for Body Mass Index. The maths is simple. You take your weight in kilograms and divide it by your height in metres, squared. So if you're 1.7 metres tall, you square that to get 2.89, then divide your weight by it.
A quick worked example
Say you weigh 70 kg and stand 1.7 m tall. Square the height: 1.7 times 1.7 is 2.89. Now divide: 70 divided by 2.89 comes to roughly 24.2. That sits just inside the normal band on the global scale. Comfortable enough, but not by a wide margin.
The standard WHO bands go like this:
- Below 18.5 means underweight
- 18.5 to 24.9 is the normal range
- 25 to 29.9 counts as overweight
- 30 and above is the obese range
Why Indians need a stricter scale
Here's where it gets interesting. Those WHO numbers were built mostly on Western bodies. Research kept showing that people of Indian and other South Asian descent carry more body fat, and more of it around the belly, at the same BMI. We pick up diabetes and heart risk earlier, at lighter weights.
So the ICMR uses tighter Asian-Indian cut-offs. Normal runs only up to 22.9. Overweight starts at 23. And 25, the global overweight line, is already the obese threshold here. Look back at our example. That 24.2 reads as normal on the WHO chart but lands in the overweight zone for an Indian adult. Same body, different verdict. Worth knowing.
What this number can't tell you
BMI is blunt by design. It only knows your height and your weight. It can't see whether the kilos are muscle or fat. A regular at the gym with serious muscle might post a BMI of 27 and be perfectly fit, because muscle is dense and heavy. Meanwhile someone thin who never moves could sit at a tidy 21 and still carry too much fat inside.
It also says nothing about where fat sits. Belly fat matters more than the rest, which is why a measuring tape around the waist often tells a sharper story.
Treat your BMI as a starting flag, not a diagnosis. If the result lands outside the healthy band, or you're simply unsure, a doctor can check your waist, blood sugar and the fuller picture. This estimate points the way. It doesn't replace that conversation.
BMI Calculator — frequently asked questions
What is a healthy BMI for Indians?
Under the ICMR Asian-Indian cut-offs, a healthy BMI runs from 18.5 to 22.9. That's stricter than the global WHO range of 18.5 to 24.9. The tighter scale exists because Indians tend to carry more body fat and more belly fat at the same weight, which raises diabetes and heart risk earlier. Anything from 23 upward is worth watching here.
How do I calculate my BMI manually?
Take your weight in kilograms and divide it by your height in metres squared. First convert your height to metres, so 165 cm becomes 1.65 m. Square that number, then divide your weight by the result. For example, 60 kg at 1.65 m gives 60 divided by 2.72, which is about 22.0. That's the whole calculation in one step.
Is BMI accurate for muscular people?
Not really. BMI only uses height and weight, so it can't tell muscle from fat. Muscle is dense and heavy, which means athletes and regular gym-goers often score in the overweight range while being genuinely fit. The opposite happens too, where a thin, inactive person reads as normal but carries excess internal fat. For muscular builds, body fat testing gives a truer answer.
Why is the Indian BMI cut-off lower than the WHO scale?
Studies found that South Asians develop weight-related illness at lower BMIs than Western populations. We accumulate more fat, especially around the abdomen, for the same number on the scale. To catch that risk early, the ICMR set overweight at 23 instead of 25, and obese at 25 instead of 30. The lower bar is meant to prompt action sooner.
Does BMI work for children and the elderly?
Standard adult BMI bands don't apply cleanly to children, who need age and sex specific growth charts instead. For older adults, a slightly higher BMI can sometimes be protective, and muscle loss skews the reading. In both cases the plain number can mislead. A doctor or paediatrician should interpret it alongside age, growth stage and overall health rather than the chart alone.
What should I do if my BMI is too high?
First, don't panic over a single figure, since BMI is a screen and not a diagnosis. Check your waist measurement too, because belly fat carries more risk. Small, steady changes help most, like walking daily, cutting back on fried and sugary food, and adding more vegetables and protein. If the number is well above the healthy range, see a doctor to rule out underlying issues.
Related calculators
Calorie Calculator
Daily calorie needs to maintain, lose, or gain weight — based on your BMR and activity level.
Pregnancy Due Date
Estimate your baby's due date.
Age Calculator
Calculate your exact age in years, total months, and total days from any date of birth — accurate down to the day.
TDEE Calculator
Estimate your total daily energy expenditure (TDEE) from age, sex, height, weight, and activity level using the Mifflin-St Jeor equation.
Results from this calculator are estimates for informational use only — not financial, medical, or professional advice. Read our full disclaimer before acting on any number you see here.