BMI (Body Mass Index) is a number calculated from height and weight to estimate body fat and classify underweight, normal, overweight, or obese.

How do I calculate BMI?

BMI = weight (kg) ÷ [height (m)]². For imperial units: BMI = (weight (lb) ÷ [height (in)]²) × 703.

What are the BMI categories?

Common categories: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (≥30).

Is BMI a perfect measure of health?

No. BMI is a quick screening tool; it does not distinguish between muscle and fat. Use other measures for deeper insight.

BMI Calculator

Q: Is BMI a perfect measure of health?

No. BMI is a quick screening tool; it does not distinguish between muscle and fat. Use other measures for deeper insight.

Check your Body Mass Index and find your ideal weight range.

Weight

Height

BMI Reference Chart

Category	BMI Range
Underweight	< 18.5
Normal Weight	18.5 – 24.9
Overweight	25 – 29.9
Obese	30 or greater

Note: BMI is a useful screening tool but doesn't measure body fat directly. Athletes with high muscle mass may have a high BMI but low body fat.

Frequently Asked Questions

How is BMI calculated?

It's a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared.

Is BMI accurate for everyone?

Not always. BMI does not distinguish between weight from muscle and weight from fat. Therefore, it might overestimate body fat in athletes and underestimate it in older adults who have lost muscle mass.