Got questions about using the Healthy Body Calculator? Ask Joanne Larsen, registered dietitian and nutrition therapist.This NHS BMI calculator checks BMI (body mass index). Use it to calculate adult BMI and child BMI accurately, and get advice and information on healthy weight management.This calculator provides BMI and the corresponding BMI weight status category. Use this calculator for adults, 20 years old and older. Learn more.Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. A high BMI can be an indicator of high body fatness.This site has moved to Please update your bookmarks and click here to visit the new site.Calculate Your Body Mass Index. Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.You use energy no matter what you're doing, even when sleeping. The BMR Calculator will calculate your Basal Metabolic Rate (BMR); the number of calories you'd burn BMI (Body Mass Index) is a measurement of body fat based on height and weight that applies to both men and women between the ages of 18 and 65 years.This four-week fitness and healthy-eating program is designed to help you get stronger, shape up, lose weight, and feel freaking AMAZING. We have everything you need Accessible Search Form. Search the NHLBI, use the drop down list to select: the entire site, the Health Topics section only, or the News and Resources section.