BMI Calculator
Calculate your Body Mass Index (BMI), see your WHO weight category, and find your healthy weight range for your height.
What Does This Tool Do?
Calculate Body Mass Index (BMI = weight ÷ height²) and see your WHO weight category with colour coding, plus the healthy weight range for your specific height.
Key Features
7 Categories
From Severely Underweight to Obese Class III.
Healthy Range
Target weight range for your height.
Formula Shown
Full BMI calculation displayed.
Instant
Immediate result.
How to Use
- Enter your weight in kilograms.
- Enter your height in centimetres.
- Click Calculate BMI.
Frequently Asked Questions
What is BMI?▾
Body Mass Index = weight (kg) ÷ height² (m²). It is a simple screening tool for weight status. WHO categories: <18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, ≥30 obese.
Is BMI accurate for everyone?▾
BMI is a population-level screening tool, not an individual diagnostic. It can misclassify muscular athletes (high BMI, low fat) and older adults (low BMI, high fat). Use with other measures.
What is a healthy BMI?▾
WHO defines 18.5–24.9 as healthy weight range. Values vary slightly by ethnicity — some Asian population guidelines use 18.5–22.9 as the healthy range.