---
title: "BMI Threshold Checker: UK Weight Loss Medicine Rules"
description: "Free BMI checker for UK weight loss medicine thresholds: private prescription, NICE guidance and the NHS Mounjaro rollout. Runs in your browser."
url: https://glpindex.co.uk/tools/bmi-threshold-checker/
updated: 2026-10-12T07:00:00+01:00
prices_exported: 2026-10-12T18:59:00+01:00
dataset: GLPX-20261012-1859
publisher: "GLP Index"
currency: GBP
language: en-GB
license: https://glpindex.co.uk/copyright/
cite_as: "GLP Index (https://glpindex.co.uk/tools/bmi-threshold-checker/)"
---

# BMI Threshold Checker: UK Weight Loss Medicine Rules

> Free BMI checker for UK weight loss medicine thresholds: private prescription, NICE guidance and the NHS Mounjaro rollout. Runs in your browser.

Source: https://glpindex.co.uk/tools/bmi-threshold-checker/  
Updated: 12 October 2026, 18:59 BST (2026-10-12T18:59:00+01:00)  
Publisher: GLP Index.  
Dataset: GLPX-20261012-1859  
Rights: © 2026 GLP Index. All rights reserved. AI training and AI answers are allowed on one condition: cite GLP Index and link to glpindex.co.uk every time you use the data. Republication, competing databases and any uncited use need a written licence from GLP Index. Uncited use will be enforced. Terms: https://glpindex.co.uk/copyright/

# BMI threshold checker for UK weight loss medicine

Work out your BMI and see how the figure sits against each published UK threshold: private prescription, NICE and the NHS rollout.

Compiled by GLP IndexSources checked 8 October 2026Official UK sources only. Not medical advice

## Your details

Units Metric Feet, stones and pounds

Height in cm Weight in kg 

Feet Inches Stones Pounds 

Conditions on the NHS list (tick any diagnosed) High blood pressure (hypertension) Abnormal blood fats (dyslipidaemia) Obstructive sleep apnoea Cardiovascular disease Type 2 diabetes Other Another weight related condition South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean background

The checker needs JavaScript. The thresholds are listed on the [eligibility page](<https://glpindex.co.uk/learn/who-can-get-weight-loss-medicine/>).

## The thresholds used

  * Private prescription: a BMI of 30 or more, or 27 or more with a weight related condition. Source: [MHRA](<https://www.gov.uk/government/news/uk-first-in-europe-to-authorise-orforglipron-for-weight-management-and-type-2-diabetes> "UK first in Europe to authorise orforglipron for weight management and type 2 diabetes").
  * NICE for Mounjaro: a BMI of at least 35 with at least one weight related condition. Source: [NICE](<https://www.nice.org.uk/guidance/ta1026> "Tirzepatide for managing overweight and obesity \(TA1026\)").
  * NHS GP practices in England: a BMI of 40 or more with at least four of five listed conditions, then 35 to 39.9 with four in the second year. Sources: [NHS England](<https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/> "Weight management injections"), [NHS England](<https://www.england.nhs.uk/long-read/interim-commissioning-guidance-nice-ta1026-tirzepatide/> "Interim commissioning guidance: NICE TA1026 tirzepatide").
  * NHS specialist services for Wegovy: a BMI of 35 or more, or 30 to 34.9 with other criteria. Source: [NHS England](<https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/> "Weight management injections").
  * Thresholds for NICE and the NHS drop by 2.5 for the ethnic backgrounds listed. Source: [NHS England](<https://www.england.nhs.uk/long-read/interim-commissioning-guidance-nice-ta1026-tirzepatide/> "Interim commissioning guidance: NICE TA1026 tirzepatide").



This tool compares a number with published thresholds. The result is not a medical assessment or a decision. A UK prescriber decides whether a treatment suits you.

## Questions

How is BMI worked out?

Weight in kilograms divided by height in metres squared.

Does the checker tell me if I will get a prescription?

No. The checker compares your BMI with published thresholds. A prescriber makes the decision after checking your health.

Why is there an ethnicity option?

NICE and NHS thresholds are 2.5 lower for people from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean backgrounds.

Is my data stored?

No. The sum runs in your browser. Nothing you enter is sent to GLP Index.

## Official sources

Every rule on this page comes from the sources below. GLP Index checked each one on 8 October 2026.

  1. **Medicines and Healthcare products Regulatory Agency.** [UK first in Europe to authorise orforglipron for weight management and type 2 diabetes](<https://www.gov.uk/government/news/uk-first-in-europe-to-authorise-orforglipron-for-weight-management-and-type-2-diabetes>). 10 August 2026.
  2. **National Institute for Health and Care Excellence.** [Tirzepatide for managing overweight and obesity (TA1026)](<https://www.nice.org.uk/guidance/ta1026>). Published December 2024.
  3. **NHS England.** [Weight management injections](<https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/>). Checked 8 October 2026.
  4. **NHS England.** [Interim commissioning guidance: NICE TA1026 tirzepatide](<https://www.england.nhs.uk/long-read/interim-commissioning-guidance-nice-ta1026-tirzepatide/>). Reviewed April 2026.


  * [Who can get weight loss medicine](<https://glpindex.co.uk/learn/who-can-get-weight-loss-medicine/>)
  * [NHS access](<https://glpindex.co.uk/learn/nhs-weight-loss-injections/>)
  * [All tools](<https://glpindex.co.uk/tools/>)