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BMI Calculator – Body Mass Index and Healthy Weight

Work out your body mass index from your height and weight, see your category and the weight range that is healthy for your height.

South Asian adults are at higher risk at a lower BMI, so the Asia-Pacific scale flags overweight from 23.

Your BMI

Category

Healthy weight for your height

Bar scale: under 18.5, healthy, overweight, obese (approximate, not to scale for the Asia-Pacific cut-offs).

Enter a realistic height (50 to 250 cm) and weight to see your BMI.

BMI is a screening number for adults. It does not measure body fat, muscle or health, and it is not suitable for children, pregnancy or athletes. It is not medical advice; talk to a doctor about your own health.

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About the BMI Calculator

The BMI Calculator works out your body mass index from your height and weight in metric or imperial units, shows your category on the WHO international scale or the WHO Asia-Pacific scale, and gives the weight range that counts as healthy for your height. BMI is a screening number for adults, not a diagnosis.

BMI Calculator quick facts

Formula:
BMI = weight in kg ÷ height in metres squared
WHO scale:
Normal 18.5 to 24.9, overweight from 25, obese from 30
Asia-Pacific scale:
Normal 18.5 to 22.9, overweight from 23, obese from 27.5
Units:
Metric (kg, cm) and imperial (lb, ft and in)
For:
Adults. BMI is a screening number, not a diagnosis

How to use the BMI Calculator

  1. Choose metric (kg, cm) or imperial (pounds, feet and inches).
  2. Enter your weight and height and pick the category scale.
  3. Read your BMI, category and the healthy weight range for your height.

What BMI tells you

BMI compares your weight to your height. It is quick and free, which is why doctors use it to screen large groups, but it is only a starting point. Waist size, fitness, age and family history matter too.

Worked example

A person of 70 kg and 175 cm has a BMI of about 22.9, which is normal weight on the WHO scale and normal on the Asia-Pacific scale. At 80 kg and 170 cm the BMI is 27.7: overweight on the WHO scale and obese on the Asia-Pacific scale.

When not to rely on it

Do not use BMI to judge children, pregnancy, or very muscular people. If you are worried about your weight or health, speak to a doctor or dietitian.

Frequently asked questions about the BMI Calculator

How is BMI calculated?

BMI is weight in kilograms divided by height in metres squared. A person who weighs 70 kg and is 1.75 m tall has a BMI of 70 ÷ (1.75 × 1.75) = 22.9.

What are the BMI categories?

On the WHO international scale, a BMI under 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight and 30 or more is obese. The Asia-Pacific scale uses lower cut-offs, so you can switch scales. BMI is a screening guide, not a diagnosis.

Why is there an Asia-Pacific scale?

The WHO identified that people of Asian origin carry more risk of diabetes and heart disease at a lower BMI, and added action points at 23 and 27.5. On that scale overweight starts at 23 and obese at 27.5.

Is BMI accurate for everyone?

No. It does not measure body fat, muscle or where fat sits. It can mislead for athletes, older adults, pregnant women and people with a lot of muscle, and it is not designed for children.

What is a healthy weight for my height?

The calculator shows the weight range that gives a BMI of 18.5 up to the top of the normal range for your height and chosen scale.

Will India change its BMI guidance?

Reports in 2026 say ICMR is preparing national obesity guidelines. If official cut-offs change, the scales on this page will be updated; ask your doctor which applies to you.

Official sources: World Health Organization: BMI, WHO expert consultation on BMI in Asian populations (The Lancet, 2004).

Free, no sign-up. Reviewed 15 October 2026 by the Gopafy team. See all free tools.

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