freesabaiBMI calculator
Type your height and weight and get your body mass index (BMI) at once, read with the Asian cut-offs, along with the weights that count as normal for your height.
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Height and weight
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How to use it
- Type your height in centimeters and your weight in kilograms; decimals are fine.
- You get the BMI to one decimal and its class; the pin on the colored bar shows where it falls.
- The line below gives the weights that count as normal at this height.
How it is worked out
BMI = weight (kg) ÷ height (m) squared. At 170 cm and 65 kg: 65 ÷ (1.7 × 1.7) = 22.5.
It is read with the World Health Organization cut-offs for Asia-Pacific populations: under 18.5 underweight, 18.5–22.9 normal, 23–24.9 overweight, 25–29.9 obese (class 1), 30 and over obese (class 2 or more). The class is read from the BMI as shown, to one decimal, so the number and the class always agree.
Good to know
- BMI is a rough figure from height and weight only. It cannot tell muscle from fat, and it is not a diagnosis or medical advice.
- It does not suit growing children and teenagers, pregnant women, older people or very muscular athletes. If you are worried about your weight, see a doctor.
- Many sites use the international cut-offs (normal up to 24.9), so their result can differ from this page.
- Height in feet and inches, or weight in pounds? Convert first with the unit converter. Everything is worked out on your device; no number is sent anywhere.
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Questions and answers
What BMI is normal?
With the Asian cut-offs that Thai hospitals use, 18.5 to 22.9 is normal, 23 to 24.9 is overweight and 25 or more is obese.
Why is my result different from other sites?
Many sites use the international cut-offs, where normal goes up to 24.9. This page uses the WHO cut-offs for Asian populations, where overweight starts at 23.
Can BMI be used for children?
No. Growing children and teenagers need growth charts by age and sex, and BMI also misreads pregnant women and very muscular athletes.
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