Enter your height and weight — this BMI calculator instantly shows your Body Mass Index and where it falls on the standard WHO scale.
Choose your unit system and adjust the sliders or type your own numbers.
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Your BMI
BMI is a screening tool, not a diagnosis. It doesn't account for muscle mass, bone density, or body composition.
Body Mass Index is a quick screening number that relates your weight to your height. It doesn't measure body fat directly, but it's a widely used starting point for gauging whether your weight falls in a healthy range.
Height and weight, in metric or imperial units.
It applies the standard WHO BMI formula used worldwide.
Your BMI number plus which category it falls into.
The BMI formula
BMI = weight (kg) ÷ height (m)²
weight = your body weight in kilograms
height = your height in metres, squared
A worked example
A person who is 170 cm tall and weighs 65 kg works out like this:
| Height | 170 cm (1.70 m) |
| Weight | 65 kg |
| Height squared | 2.89 m² |
| BMI | ≈ 22.5 |
| Category | Normal weight |
A BMI of 22.5 sits comfortably inside the 18.5–24.9 normal range — being far outside this band on either side is linked to higher health risks.
For most adults, a BMI between 18.5 and 24.9 is considered a normal, healthy weight range according to WHO guidelines.
Not entirely. BMI doesn't distinguish between muscle and fat, so athletes or very muscular people can show a higher BMI without excess body fat. It's also less reliable for elderly people, pregnant women, and growing children.
Treat it as a starting point, not a verdict. Talk to a doctor or dietitian who can look at your full health picture before making any changes.
The formula is the same for everyone, but body composition naturally differs between men and women, so the same BMI can mean a different body fat percentage for each.
BMI is just one number — pair it with a doctor's advice for the full story.