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BMI Calculator

BMI is your weight relative to height. While it does not directly measure body fat, it is a useful screening tool to identify potential weight categories.

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Free to use — no sign-in required.

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Demo video coming soon

What you'll get

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BMI Score & Category

Your exact BMI number with underweight, normal, overweight, or obese classification.

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Age & Gender Context

Results adjusted for your demographic.

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Health Context

Clear note that BMI does not directly measure body fat percentage.

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Next Steps

Recommendations based on your category.

How it works

Enter your height, weight, age, and gender.
Get your BMI score instantly.
See your category and what it means.
Get recommended next-step calculators.

Frequently asked questions

What is BMI?

BMI stands for Body Mass Index. The CDC describes it as weight relative to height. It does not directly measure body fat.

Is BMI accurate?

BMI is a screening tool, not a diagnostic one. Athletes with high muscle mass may have high BMI without excess fat.

What is a healthy BMI?

Generally 18.5-24.9 is considered normal weight, but individual factors matter.

BMI Calculator

Calculate your Body Mass Index using height, weight, age and gender. Understand your BMI category with context about what BMI measures.

Open Tool