BMI Calculator

BMI Formula & Categories

Body Mass Index (BMI) = weight (kg) ÷ height (m)². This calculator accepts kilograms and centimetres, or pounds with feet and inches.

BMI Categories for Adults (WHO)

Asian-Indian BMI Cut-offs

Indians and other South Asians tend to carry more body fat and face higher cardio-metabolic risk at a lower BMI, so several Indian guidelines lower the thresholds:

The gauge above uses the WHO categories. BMI does not distinguish muscle from fat and is not suitable for athletes or pregnant women. Results are for reference only — speak to your doctor about any health concerns.

Frequently Asked Questions

What is a healthy BMI?

Using the standard WHO ranges, a BMI of 18.5–24.9 is a healthy weight, below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.

How is BMI calculated?

BMI = weight (kg) ÷ height (m)². For example, 68 kg at 1.70 m gives a BMI of about 23.5. The calculator converts pounds, feet and inches for you when you use imperial units.

Do Indians have different BMI cut-offs?

Yes. Many Indian and Asian guidelines use lower thresholds because health risks such as diabetes appear at a lower BMI: overweight from a BMI of 23 and obese from 25. We show the WHO categories on the gauge, but you should treat 23 and above as a point to take care.

Is BMI accurate?

BMI does not distinguish muscle from fat, so it can be misleading for athletes, pregnant women and older adults. Use it as a general screening tool and also consider your waist measurement and body-fat percentage.

What is my healthy weight range?

A healthy weight is a BMI of 18.5–24.9 multiplied by your height (m)². At 1.70 m that is roughly 53–72 kg, or about 118–158 lb.