Calculate Your BMI
BMI Classification Table (WHO)
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Moderate risk |
| 18.5 – 24.9 | Normal weight | Low risk |
| 25.0 – 29.9 | Overweight | Increased risk |
| 30.0 – 34.9 | Obese Class I | High risk |
| 35.0 – 39.9 | Obese Class II | Very high risk |
| 40.0 and above | Obese Class III | Extremely high risk |
How to calculate BMI
1
Choose your preferred unit system — Metric (kilograms and centimetres) or Imperial (pounds and feet).
2
Enter your current weight and height accurately. You can optionally add age and gender for more context.
3
Your BMI is calculated instantly. The result shows your BMI value, category, and healthy weight range.
4
Check the BMI scale bar to visually see where you fall. Remember, BMI is a screening tool — consult a doctor for medical advice.
BMI Calculator FAQ
What is BMI and why does it matter? ▼
Body Mass Index (BMI) is a simple calculation using height and weight to estimate body fat. It's widely used as a screening tool to identify potential weight-related health issues. A BMI between 18.5 and 24.9 is considered healthy for most adults.
Is BMI accurate for everyone? ▼
BMI has limitations. It doesn't account for muscle mass (athletes may show "overweight" BMI), bone density, age, ethnicity, or distribution of fat. It's a useful starting point but not a definitive health measure. Always consult a healthcare provider for proper assessment.
What is the BMI formula? ▼
Metric: BMI = weight (kg) ÷ height (m)². For example, 70kg ÷ (1.75m × 1.75m) = 22.9 BMI. Imperial: BMI = 703 × weight (lbs) ÷ height (inches)².
Is this BMI calculator appropriate for children? ▼
This calculator uses adult BMI standards. For children and teenagers (ages 2–19), BMI is interpreted differently using age and sex-specific charts. Please consult a paediatrician for children's weight assessment.