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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.

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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