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Body Mass Index (BMI)

BMI Calculator

Knowing BMI can help adult men and women understand their overall health. Use the BMI calculator below to determine your body mass index by inputting your height and weight.

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These calculations are based on averages.

Understanding your Body Mass Index

Now that you know your body mass index you are one step closer to mastering your overall health. Find out how to understand your BMI

If your BMI is below 18.5:

Your BMI is considered underweight. Keep in mind that an underweight BMI calculation may pose certain health risks. Please consult your healthcare provider for more information about BMI calculations.

If your BMI is between 18.5 – 24.9:

Your BMI is considered normal. This healthy weight helps reduce your risk of serious health conditions and means you’re close to your fitness goals.

If your BMI is above 30:

Your BMI is considered overweight. Being overweight may increase your risk of cardiovascular disease. Consider making lifestyle changes through healthy eating and fitness to improve your health. Our Couch to 5K training plan is a great place to start.

The body mass index (BMI) is a quick and easy way to see if your weight is within the normal or average range for your height. It might sound complicated, but your BMI is just a calculation using the ratio of your weight to your height to determine how much body fat you have. It was originally developed in the 19th century by a well-known statistician, Lambert Quetelet, but has undergone changes over the years as scientists learn more about the relationship between weight and health.

Ken Fujioka, MD, director of the Center for Weight Management and director of nutrition and metabolic research at Scripps Clinic in La Jolla, Calif., says that knowing your BMI can be particularly helpful if you are between 20 and 30 pounds overweight. “Most Americans can tell if they are overweight by stepping on the scale,” Dr. Fujioka says. “And if someone is seriously overweight, they know it. But if your weight is borderline between normal and overweight, checking your BMI can be useful.”