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A person's BMI, or body mass index, is based on height and weight. It's often used to determine if a person is underweight, normal weight, overweight, or obese. But BMI doesn't consider muscle mass. Follow the links below to find WebMD's comprehensive coverage about how BMI is calculated, what it means, how to measure it with our innovative BMI Plus Calculator tool, and much more.

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Thumbnail: Need to Lose Weight? Questions to Ask Your Doctor

When you're setting out to lose weight, your doctors can help. But they may not talk about it much until you bring it up. Use these questions to start the conversation.

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