WeightExplainer
What Is BMI? How It's Calculated and Its Limits
Body mass index explained: the formula, adult BMI categories, lower cut-offs for some ethnic groups, and the limits of BMI as a health measure.
2 min read
Health topic
Weight Management
Healthy weight management is about sustainable eating, activity and sleep habits rather than quick fixes. This hub explains common measures such as BMI and waist size, what they can and cannot tell you, and how energy needs are estimated.
Weight is personal and influenced by many factors, including genetics, medicines and health conditions. Our calculators give general estimates only.
What this topic covers
BMI and its limits
What body mass index measures and where it falls short.
Energy needs
How calorie estimates are calculated and why they are only a starting point.
Sustainable changes
Small, repeatable changes to meals, drinks and activity.
Getting support
When to talk to a doctor or dietitian.