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BMI Calculator

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Weight

Height

Enter your weight and height to calculate.

How to calculate BMI?

Formula: BMI = weight (kg) ÷ height² (m)
Example: 70 kg ÷ (1.75 × 1.75) = BMI of 22.9

What is a healthy BMI?

WHO guidelines: under 18.5 = underweight; 18.5–24.9 = healthy weight; 25–29.9 = overweight; 30+ = obese. These apply to adults aged 18–65.

Is BMI accurate?

BMI is a screening tool, not a diagnosis. It doesn't distinguish muscle from fat. A muscular athlete may have a high BMI without being overweight. It's less reliable for elderly people, children, and pregnant women.

How do I convert lbs and feet to BMI?

Our calculator converts automatically. Manual conversion: 1 lb = 0.4536 kg; 1 foot = 30.48 cm. Then apply the standard BMI formula.