About this data
- Body mass index (BMI) is weight in kilograms divided by the square of height in metres. For adults, a BMI of 25 or more counts as overweight and 30 or more as obese; overweight here includes obesity.
- Each survey measures height and weight, but they differ in their methods and samples, so small differences between nations shouldn't be over-interpreted. Scotland's figures for 2022 to 2024 combine measured and adjusted self-reported heights and weights.
- Northern Ireland's survey runs from April to March and is shown by the year it starts. It didn't measure height and weight from 2020/21 to 2022/23, and Scotland's and England's surveys didn't in 2020; their 2021 figures, from self-reported measurements, aren't shown.
- Wales's National Survey asks people for their height and weight rather than measuring them, which tends to give lower figures, so it isn't shown.
This chart appears in Obesity.