BMI calculator
Enter your height and weight to see your BMI, your healthy range, and where you stand against UK treatment thresholds.
What the BMI bands mean
| BMI | Band | Weight loss treatment |
|---|---|---|
| Below 18.5 | Underweight | Not eligible, speak to your GP if you are losing weight without trying |
| 18.5 to 24.9 | Healthy range | Not eligible. These medicines are not for cosmetic slimming |
| 25 to 26.9 | Overweight | Not eligible on BMI alone |
| 27 to 29.9 | Overweight | Eligible only with a weight-related condition, such as high blood pressure or prediabetes |
| 30 and above | Living with obesity | Within the licensed range, subject to the full health check |
Thresholds are about 2.5 points lower for people of South Asian, Chinese, Black African and African-Caribbean backgrounds, because health risks arrive earlier.
Where BMI falls short
BMI is a screening tool, not a diagnosis. It does not distinguish muscle from fat, and it says nothing about where fat sits. Waist size adds useful context: more than 94 cm for men or 80 cm for women signals raised risk even at a moderate BMI.
Your prescriber looks at the whole picture, conditions, medicines, history, not a single number.
What to do with your result
If your BMI is 30 or above, or 27 and above with a condition, you can start the free health check. If you fall just below, focus on the fundamentals first, our guides on protein, sleep and movement apply whether or not medicine is involved.
Weight loss plans from £69 a month
Mounjaro, Wegovy, the Wegovy pill and the Foundayo pill. Each plan covers the medicine, prescriber review, monthly check-ins and tracked delivery.
Check if treatment suits youFree health check. You pay nothing until a prescriber approves.
Check your eligibilityAbout this page
- Written by
- Able Clinic editorial team
- Clinical review
- Pharmacy team at Curb Healthcare Ltd, GPhC 9012581
- Last reviewed
Each page is checked against the UK licence for the medicine. Read our editorial policy.