Calculators

• Productivity Calculator
• Resting Metabolic Rate Calculator
• Body Mass Index (BMI)
• Waist to Hip Ratio (WHR)
• Shuttle Score Converted to VO2max
• Exercise Heart Rate Zones
• Queens College Step Test Heart Rate to VO2max

Body Mass Index (BMI) Calculator

Please enter your height (metres) and your weight (kilograms) below.

Height:	metres (eg. 1.76)
Weight:	kilograms (eg. 73.50)

Body mass index (BMI) is used to estimate your total amount of body fat.

Once you have measured your BMI, you can determine your healthy weight range. If you have a BMI of:

• < 18 - you are very underweight and possibly malnourished
• 18 to 20 - you are underweight and could afford to gain a little weight
• 20 to 25 - you have a healthy weight range for young and middle-aged adults
• 23 to 28 - you have a healthy weight range for older adults
• 26 to 30 - you are mildly overweight
• > 30 - you are very overweight or obese

Some exceptions to the rule BMI does not differentiate between body fat and muscle mass. This means there are some exceptions to the rules:

• Muscles - body builders and people who have a lot of muscle bulk will have a high BMI but are not overweight.
• Physical disabilities - people who have a physical disability and are unable to walk may have muscle wasting. Their BMI may be slightly lower but this does not necessarily mean they are underweight. In these instances, it is important to consult a dietitian who will provide helpful advice.
• Height - for people who are shorter (for example Asian populations), the cut-offs for overweight and obesity may need to be lower. This is because there is an increased risk of diabetes and cardiovascular disease, which begins at a BMI as low as 23 in Asian populations.

Differences in BMI between people of the same age and sex are usually due to body fat. However, there are exceptions to this rule.

BMI calculations will overestimate the amount of body fat for:

• Body builders
• Some high performance athletes
• Pregnant women.

BMI calculations will underestimate the amount of body fat for:

• The elderly
• People with a physical disability who are unable to walk and may have muscle wasting.

BMI is also not an accurate indicator for people with eating disorders like anorexia nervosa or people with extreme obesity.

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