Wegovy dose calculator: how semaglutide dosing actually works

The decision you're actually facing: speed versus tolerance

Most people searching for a semaglutide dose calculator are trying to answer one of two questions: am I on the right dose for my weight, or can I move up faster? Both are reasonable. Knowing that the answer depends less on your weight and more on your side-effect profile tends to be a relief, or occasionally a frustration, depending on how impatient you are to see results.

Wegovy's titration schedule (0.25 mg, 0.5 mg, 1.0 mg, 1.7 mg, 2.4 mg) is designed around tolerability, not pharmacokinetics adjusted for body mass. The NHS guidance on semaglutide is clear that each dose level is held for approximately four weeks to allow your digestive system to adapt before the next increase. That four-week minimum is the main variable a prescriber can flex; the sequence itself does not change. So a semaglutide dose calculator that takes your weight and returns a milligram figure is giving you a number with no clinical grounding, and if you are working with a compounded vial rather than a pre-filled pen, our semaglutide 5mg reconstitution calculator is a more practical starting point for understanding what you are actually drawing up.

The question to bring to your prescriber is not "what dose does my weight require" but "am I tolerating this dose well enough to consider moving up, and is my response what we'd expect at this stage". That conversation is where dose decisions actually live. Our guide to Wegovy doses explains each step in the schedule in more detail if you want the full picture before that conversation.

What does influence the pace of titration

A few things genuinely shape how quickly someone moves through the schedule, and it is worth knowing them before your next review.

Gastrointestinal tolerance is the dominant factor. Nausea, loose stools, reflux and burping are the most commonly reported side effects at every step, and they tend to be sharpest in the first week or two after an increase. If those symptoms are disruptive, a prescriber may hold the current dose for a second four-week period rather than step up. That is a clinical judgement, not a delay to push back on.

Response at maintenance dose matters too. NICE's appraisal of semaglutide for weight management notes that continuing treatment should be reviewed if weight loss is less than five per cent after six months at the maintenance dose. A prescriber who sees a strong response at 1.7 mg may not automatically rush to 2.4 mg; one who sees a modest response at 2.4 mg has clinical grounds to consider the higher 7.2 mg option, now MHRA-approved. You can read the background to that approval on our page covering the MHRA's decision on the 7.2 mg Wegovy pen.

Body weight does not directly set the dose, but it informs the clinical picture. A prescriber reviewing your notes will consider your starting BMI, how much weight you have lost so far, any comorbidities, and any medicines that might interact with semaglutide's effect on gastric emptying. That is a different exercise from plugging numbers into a calculator.

Clicks, units and why the pen format matters

Part of the confusion around Wegovy dosing comes from the pen itself. Unlike a vial-and-syringe set-up, the pre-filled Wegovy pen dispenses a fixed dose with each injection, you do not draw up or measure anything. The dose is set by the pen you have been prescribed, not by how you use it.

That design eliminates measurement error at home, but it does prompt questions about what happens at the boundaries of a dose change. If you have been prescribed a particular pen and want to understand how the mechanism works, our detailed page on how Wegovy dose relates to pen clicks walks through the mechanics. For the specific 2.4 mg maintenance pen, there is also a focused page on dose delivery at 2.4 mg.

One thing worth flagging plainly: sublingual semaglutide (drops placed under the tongue) is not a licensed route for Wegovy in the UK. If you have seen this framed as an equivalent option, that framing is not supported by MHRA-approved evidence. Stick to the licensed form your prescriber has authorised.

You can find the full treatment cost context on our weight-loss treatments overview if you are still weighing up the practical side.

When to raise dose questions with a prescriber

If you are on Wegovy and genuinely uncertain whether your dose is appropriate (you have lost very little weight at a dose you have tolerated well for two months, say, or you are experiencing persistent side effects that are not settling) that is worth raising at your next clinical review. It is one of the things our prescribers hear regularly. The answer will come from looking at your notes, not from a formula.

People sometimes feel awkward raising this, as though questioning the pace implies impatience rather than a legitimate clinical query. It is a legitimate clinical query. A prescriber who can see your full history is the right person to assess whether a change makes sense, whether staying put is wiser, or whether the 7.2 mg dose warrants a conversation. Our clinical team's approach to that review process is outlined on the clinical team page.

If you have not yet started Wegovy and are trying to work out whether it is suitable, the practical next step is a free consultation rather than trying to calculate doses in advance. Speak to our prescribers, a real clinician reviews your answers the same day, and that conversation will answer the dose question far more usefully than any calculator can.