BMI Calculator: Check Your Body Mass Index

What does my BMI mean?

For most adults, an ideal BMI is in the 18.5 to 24.9 range.

• Under 18.5: You are considered underweight.
• 18.5 to 24.9: You are within the healthy weight range for young and middle-aged adults.
• 25.0 to 29.9: You are considered overweight.
• 30 or higher: You are considered obese.

Limitations of the BMI

While BMI is a useful starting point for important conditions that become more likely when a person is overweight or obese, it does have limitations. It does not distinguish between weight coming from muscle vs. fat. Thus, heavily muscled athletes may have a high BMI but very little body fat.