Calculate your Body Mass Index and weight category instantly
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
BMI is a screening tool only. Consult a healthcare professional for a full assessment.
The WHO defines normal weight as 18.5–24.9 for adults. Below 18.5 is underweight; 25–29.9 is overweight; 30+ is obese.
BMI does not account for muscle mass, bone density or fat distribution. Athletes may have a high BMI despite very low body fat.
BMI = weight (kg) ÷ height² (m²). A person weighing 70 kg at 1.75 m has a BMI of 70 ÷ 3.06 ≈ 22.9.
This calculator is designed for adults (18+). For children and teens, a BMI-for-age percentile chart from a paediatrician is recommended.
