Calculate your Body Mass Index and healthy weight range
A BMI between 18.5 and 24.9 is considered normal/healthy. BMI under 18.5 is underweight; 25–29.9 is overweight; 30 and above is obese. Note that BMI is a screening tool, not a direct measure of body fat or health.
BMI is a useful population-level screening tool but has limitations for individuals. It does not distinguish between muscle and fat mass, so very muscular people may have a high BMI without excess body fat. It also doesn't account for age, sex, or ethnicity differences in body composition.
According to the Australian Institute of Health and Welfare, the average BMI of Australian adults is approximately 27–28, placing the average Australian in the 'overweight' category. About 2 in 3 Australian adults are classified as overweight or obese.
BMI = weight (kg) ÷ height (m)². For example, a person who is 70 kg and 170 cm tall has a BMI of 70 ÷ (1.70²) = 70 ÷ 2.89 = 24.2, which is in the normal range.
The healthy weight range for your height is calculated as: minimum weight = 18.5 × height(m)², maximum weight = 24.9 × height(m)². For example, at 170 cm: min = 18.5 × 2.89 = 53.5 kg, max = 24.9 × 2.89 = 71.9 kg.