BMI calculator
Calculate your body mass index (BMI) from your height and weight, see which category it falls in, and find the healthy weight range for your height.
These are estimates for healthy adults, not medical advice. They are not meant for pregnancy, breastfeeding, people under 18 or anyone with a medical condition. Talk to a doctor or dietitian about your own needs.
Let BerryFit track it for you
BerryFit sets your daily calorie and macro targets, lets you log a meal with a photo, and shows what is left for the day.
How it works
BMI is your weight in kilograms divided by the square of your height in metres. For example, 70 kg at 1.75 m gives 70 ÷ (1.75 × 1.75) = 22.9.
The World Health Organization groups adult BMI like this: below 18.5 is underweight, 18.5 to 24.9 is a healthy weight, 25 to 29.9 is overweight and 30 or more is obesity.
BMI is a quick screening number, not a diagnosis. It cannot tell muscle from fat, so very muscular people can get a high result, and some health organisations use lower limits for people of Asian descent.
Frequently asked questions
Is BMI accurate?
BMI is a useful starting point for most adults, but it does not measure body fat directly. Your waist size and a check-up with a doctor give a fuller picture.
Does BMI work for children?
No. For children and teenagers, BMI is compared with growth charts for their age and sex, so this calculator is for adults aged 18 and over.
What is a healthy weight for my height?
The calculator shows the weight range that gives a BMI of 18.5 to 24.9 for your height.