BMI Calculator
Body Mass Index in metric or imperial units, with WHO and Asian-Indian cut-offs and your healthy weight range.
About BMI Calculator
This BMI calculator works out your body mass index from your height and weight in metric (cm, kg) or imperial (feet and inches, lb) units. It shows your category under both the WHO scale and the lower Asian-Indian cut-offs, which suit people in India, along with the healthy weight range for your height.
It works for adult men and women and gives a quick screening check before you plan diet or exercise. BMI does not apply to children, pregnancy or very muscular builds, so read the result with that in mind. The calculator is free, needs no sign-up, and your details stay on your device.
How to use BMI Calculator
- Choose metric (cm, kg) or imperial (ft/in, lb).
- Enter your height and weight.
- Read your BMI and category for both WHO and Asian-Indian cut-offs.
- Check the healthy weight range for your height.
Frequently asked questions
Why are Asian-Indian BMI cut-offs lower?
Studies show South Asians develop diabetes and heart disease at lower BMI. Indian consensus guidelines (2009) treat 23–24.9 as overweight and 25 or above as obese, versus 25 and 30 in the WHO scale.
Is BMI accurate for athletes?
No. BMI does not separate muscle from fat, so muscular people can read as overweight. Pair it with waist size or body-fat percentage.
What is a healthy BMI?
18.5 to 24.9 under WHO, and 18.5 to 22.9 under Asian-Indian guidelines for adults.
How is BMI calculated?
BMI = weight in kg ÷ (height in metres)². For 70 kg and 1.70 m, BMI is 70 ÷ 2.89 = 24.2.
How do I calculate BMI with height in feet?
Switch to imperial units and enter feet and inches, or convert to metres by multiplying total inches by 0.0254. The calculator converts it for you.
Is BMI different for men and women?
The formula and adult cut-offs are the same for both. Women usually carry more body fat at the same BMI, so body-fat percentage can add useful detail.
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