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BMI Calculator

Free BMI calculator. Calculate your Body Mass Index and find your healthy weight range using metric or imperial units.

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BMI Calculator

BMI Categories (WHO)

BMI RangeCategory
Below 18.5Underweight
18.5 – 24.9Normal weight
25.0 – 29.9Overweight
30.0 – 34.9Obese (Class I)
35.0 and aboveObese (Class II+)

How BMI is Calculated

1
Metric: BMI = weight (kg) ÷ height² (m). Convert cm to m by dividing by 100 first.
2
Imperial: BMI = 703 × weight (lb) ÷ height² (inches).
3
Compare your result against the WHO BMI category table to understand your weight status.

Frequently Asked Questions

Is BMI an accurate health indicator? ▼
BMI is a useful screening tool but has limitations. It does not directly measure body fat or account for muscle mass, bone density, or fat distribution. Athletes may show a high BMI despite being very healthy.
What is a healthy BMI for adults? ▼
According to the WHO, a BMI between 18.5 and 24.9 is considered healthy for most adults. However, optimal ranges may vary by age and ethnicity.
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