BMI Calculator

BMI Calculator — What Is Your Body Mass Index?

Our free BMI calculator helps you find out your Body Mass Index quickly and accurately. BMI is the most widely used screening tool for assessing whether a person has a healthy body weight relative to their height. Use this BMI calculator to check where you stand and what it means for your health.

How Does This BMI Calculator Work?

This BMI calculator uses the standard World Health Organization formula: BMI = weight (kg) ÷ height (m)². Enter your height and weight in either metric or imperial units and the BMI calculator instantly gives you your BMI score along with your weight category. The BMI calculator also shows how much you would need to weigh to fall within the healthy BMI range for your height.

BMI Calculator Categories — What Does Your Score Mean?

• Under 18.5 — Underweight: May indicate nutritional deficiency. Consult a doctor.
• 18.5 to 24.9 — Normal weight: Healthy BMI range according to the WHO BMI calculator standard.
• 25 to 29.9 — Overweight: Elevated risk of health complications. Lifestyle changes recommended.
• 30 and above — Obese: Significantly increased health risk. Medical advice recommended.

Limitations of the BMI Calculator

While the BMI calculator is a useful screening tool, it has known limitations. The BMI calculator does not distinguish between muscle and fat — a muscular athlete may score as overweight on a BMI calculator despite being very fit. The BMI calculator also does not account for age, sex, or ethnicity differences in body composition. Use your BMI calculator result as a starting point, not a definitive health verdict.

BMI Calculator — Frequently Asked Questions