Do you know your BMI?

Find yours with our BMI calculator

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

About Body Mass Index

BMI under 18.5: Underweight
BMI 18.5 – 24.9*: Healthy weight
BMI 25 – 29.9: Overweight
BMI 30+: Obese


Our programme will help you
Reach your healthy weight with WW

Step into the healthy weight range with WW. Build sustainable healthy habits that will help you lose weight, and keep it off for life. Compare WW with these popular weight loss plans to decide which is best for you.


What is BMI and what does it measure?


BMI is a simple measure of weight in relation to height. It estimates percentage of body fat, and is used to broadly measure weight-related health risk.

A higher percentage of body fat is proven to be associated with increased risk for developing certain diseases such as heart disease, high blood pressure, type 2 diabetes, breathing problems, certain cancers and a higher risk of early death.

Underweight is the range of weight that is lower than what is generally considered healthy for a given height. It may indicate underlying medical conditions or an eating disorder, plus higher risk for conditions such as osteoporosis.

How accurate is a BMI calculator?

WW and BMI

**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.