Get your BMI in seconds

BMI calculator

Body Mass Index (BMI) is a measure for weight-related health risk. Check yours with our BMI calculator below.
 

Understanding your BMI result

Under 18.5

Underweight. This could be a sign that you're not eating enough, or indicate underlying medical conditions. Your GP can help if you're underweight.

18.5 – 24.9*

Healthy weight. Keep up the good work!

25 – 29.9

Overweight. Building healthy habits, like eating healthily and being more active, can help you lose weight.

30+

Obese. Building healthy habits, like eating healthily and being more active, can help you lose weight.

How to lose weight and lower your BMI

Our customised weight loss plans can help lower your BMI.

What is BMI and what does it measure?

BMI calculator
Height & weight chart

BMI alone may not be the most accurate measure of weight-related health risk. Check out the height to weight chart below, then scroll to read more about the limitations of BMI.

How accurate is a BMI calculator?

Lower your BMI with WW

**WW is committed to be a responsible provider of programmes and services that inspire healthy habits for real life. We encourage people to attain ultimate weight goals that are realistic and sustainable. We have specifically chosen to be conservative in our policies and procedures and, as such, have a “floor” on our healthy weight range of a BMI of 20. This is done for two reasons. First, the weight ranges serve to assess eligibility for membership and require that a potential member be at least 5 pounds above the minimum weight. If we used a BMI of 18.5, individuals who are already at a lower weight would be eligible to join. Second, we encourage people to attain ultimate weight goals that are realistic and sustainable.