About
What this site is for
UK BMI Scale is a simple tool for adults in the UK who want a quick BMI result, a healthy-weight range for their height, and an extra UK percentile estimate for context.
Last reviewed: 20 April 2026
What makes this different
The official NHS calculator gives you a BMI result and advice. This site does not replace that. It adds one extra layer: an estimated comparison against published UK adult BMI data by age and sex.
If you want the official NHS service, use the NHS adult BMI calculator.
Who this is for
This calculator is intended for adults aged 18 and over in the UK.
It is not suitable for children, teenagers, or pregnancy.
What this site is not
This site is not medical advice.
This site is not affiliated with, endorsed by, or operated by the NHS.
BMI is a starting point only. If you are worried about your weight, eating, or overall health, speak to your GP, pharmacist, or another qualified health professional.
Publisher
This site is published as UK BMI Scale at ukbmi.co.uk. It is an independent project and is not affiliated with the NHS or any UK government body.
Contact details are on the contact page.
Useful pages
Read the methodology page to see how the percentile estimate is calculated.
Read the editorial policy to see how content is reviewed and updated.