What BMI do you need to get Wegovy in the UK?

You've looked up your BMI and you're wondering if it's enough

Picture this: you've used the NHS BMI calculator and you have a number in front of you. Maybe it's 31. Maybe it's 28. The question now is whether that figure gets you across the line for Wegovy. The honest answer is that the BMI threshold is a gateway, not a guarantee.

Wegovy's UK marketing authorisation covers adults with a BMI of 30 or more, or a BMI of 27 to 29.9 if there is at least one weight-related condition present, things like hypertension, dyslipidaemia, obstructive sleep apnoea, prediabetes, or type 2 diabetes. That applies to private prescriptions. So if your BMI sits at 28 and you have high cholesterol that your GP has flagged, you could meet the licensed threshold. If your BMI is 28 with no qualifying condition, you would not.

One detail that often gets missed: those thresholds shift for some ethnic backgrounds. For adults of South Asian, Chinese, Middle Eastern, Black African or African-Caribbean heritage, the relevant BMI figures are 2.5 kg/m² lower throughout. That means private eligibility can start at around BMI 24.5 with a qualifying condition. Our clinical team explains this in more detail on our Wegovy BMI guidance page.

Your BMI number is real-world useful, but it is one piece of information. The prescriber also looks at your medical history, current medications, and whether any contraindications apply, a nuanced picture, not a tick-box.

What Wegovy's licensed BMI threshold actually means day-to-day

Meeting the BMI figure means you can be considered, it does not mean the prescription is automatic. That distinction matters because Wegovy is a prescription-only medicine for good reason: semaglutide works on appetite and energy regulation, and it interacts with your body's other systems. A prescriber needs to be satisfied that treatment is appropriate for you specifically.

At a private clinic or online pharmacy like ours, the pathway is: you complete a consultation, a GPhC-registered Independent Prescriber reads your answers the same day (a real clinician, not a software system), and they reach a clinical decision. If you are approved and order before midday on a weekday, your treatment is dispatched that day and arrives the next working day via DPD in plain packaging, something a lot of people find reassuring. If the prescriber has questions or needs further information, they will contact you rather than simply decline.

For those wondering whether a BMI of exactly 25 might stretch to eligibility, the short answer is that it sits below the licensed threshold for weight management without a qualifying condition. There is a fuller explanation of that edge case on our page about whether a BMI of 25 qualifies for Wegovy. The information on what BMI you need for Wegovy covers the full range if you want to cross-reference your own figure.

It is also worth knowing that Wegovy carries a Black Triangle (▼) designation from the MHRA, meaning it is subject to additional monitoring. That is standard for newer medicines and does not imply it is unsafe, it simply means reporting of side effects is actively encouraged.

NHS Wegovy access: why the threshold is higher than the licence

The NHS does not fund Wegovy for everyone who meets the licensed BMI figure. NICE's technology appraisal TA875 recommends semaglutide (Wegovy) only within specialist weight management services, for adults with a BMI of at least 35 (or 30–34.9 in people who meet specialist-referral criteria) alongside at least one weight-related comorbidity. It is also recommended for a maximum of two years under that guidance. Ethnic-background thresholds apply here too, with the NHS England figures quoted as 32.5 (instead of 35) and 27.5–32.4 (instead of 30–34.9) for the groups listed above.

Waiting lists within specialist services are commonly long. That reality leads many people to look at the private route, where the licensed threshold of BMI ≥30 (or ≥27 with a condition) applies and there is no waiting list, just a same-day clinical assessment. Private treatment is not for everyone and the cost is a genuine consideration. Our Wegovy cost page sets out what private prescriptions typically involve so you can weigh that up clearly.

Scotland, Wales and Northern Ireland apply their own criteria, which can differ from NHS England's phased rollout. If you are in one of those nations and wondering about NHS access specifically, the eligibility picture is best confirmed with your GP.

Beyond the number: what else shapes the prescriber's decision

Even if your BMI clears the threshold comfortably, there are clinical situations where Wegovy is not recommended. Pregnancy, breastfeeding, and actively trying to conceive all fall outside its licensed use. The medicine is also not licensed for under-18s. A personal or family history of certain thyroid conditions (medullary thyroid carcinoma) or multiple endocrine neoplasia type 2 would mean Wegovy is not suitable. Severe gastrointestinal conditions and a prior history of pancreatitis also require careful prescriber discussion before starting.

Contraception is worth raising too, particularly for women on oral contraceptives. Because Wegovy slows gastric emptying, semaglutide may affect how oral contraceptives are absorbed, NHS England's weight management guidance advises discussing this with your prescriber before starting. Adding a barrier method during the early weeks of treatment is one option some clinicians suggest.

If you are unsure whether your own circumstances would affect eligibility, the most straightforward step is to run through a consultation. You can explore the broader range of weight management treatments at nume or read more about how to get Wegovy through a regulated UK pharmacy before deciding whether to go ahead.