Body Mass Index (BMI) is a simple screening measure that uses your height and weight to estimate whether your weight falls into a healthy range. It's one of the most widely used tools by doctors and health professionals as a quick first check, and our BMI Calculator gives you that same number instantly, in either metric or imperial units.
Just enter your height and weight, and the calculator works out your BMI and tells you which category it falls into: underweight, normal weight, overweight, or obese.
BMI is calculated by dividing your weight in kilograms by your height in metres, squared. Our calculator does this math for you and instantly shows your result along with a simple visual scale so you can see exactly where you fall.
BMI is a useful starting point, but it doesn't account for muscle mass, bone density, or body composition, so it isn't a complete picture of health on its own, particularly for athletes, older adults, or those who are pregnant. If your result concerns you, it's a good idea to speak with a healthcare professional.
Whether you're tracking your health over time or just curious where you stand, our BMI Calculator gives you a fast, private, and easy way to find out.
