How Many Units Is 2.4 mg of Wegovy, and Why Does It Matter?

Why the units question comes up, and where the confusion starts

The unit system most people encounter is the one printed on insulin syringes, where 100 units equals 1 ml of a U-100 solution. Semaglutide at the concentration used in Wegovy contains 1.34 mg per ml, so the maths doesn't map neatly onto insulin units at all. What people typically mean when they ask about units is a different convention: treating 1 mg as equivalent to 100 pharmacological units for ease of comparison. On that basis, 2.4 mg becomes 240 units, 1.7 mg becomes 170 units, and so on down the titration schedule.

That figure (240 units) is the number you'll see discussed in some clinical contexts and online forums. It is not a number you ever need to dial or draw up yourself. Wegovy's injection pen is pre-filled and pre-set; you press the button and the device delivers the dose. The relationship between semaglutide milligrams and units is genuinely useful background knowledge, but it has no bearing on how you use the pen day to day.

Worth knowing: if you see a seller offering semaglutide in vials that require you to measure doses in units yourself, that is a serious red flag. Licensed Wegovy pens are not vials. The MHRA has warned publicly about fake and unlicensed weight-loss injectables sold online, reporting any suspect product via the MHRA's Yellow Card scheme protects other patients as well as yourself.

The full dose ladder: what 2.4 mg means in the context of the titration schedule

Reaching 2.4 mg takes time, by design. The prescriber-led schedule begins at 0.25 mg weekly, moves to 0.5 mg after four weeks, then 1.0 mg, 1.7 mg and finally 2.4 mg, each step roughly four weeks apart, allowing your body to adjust and reducing the chance of nausea or other gastrointestinal side effects during that adjustment period. The Wegovy dose schedule is set out in the medicine's SmPC and patient information leaflet, which remain the definitive reference for timing and missed-dose guidance.

2.4 mg is the standard maintenance dose that most patients eventually reach. Clinical trial evidence (STEP 1, published in the New England Journal of Medicine) found that participants on 2.4 mg semaglutide lost an average of around 15% of body weight over 68 weeks, alongside lifestyle support. That evidence base informed NICE's recommendation of semaglutide for eligible adults, detailed in NICE Technology Appraisal TA875.

From April 2026, Wegovy also became available in a higher 7.2 mg maintenance dose (approved by the MHRA) which narrowed the gap with tirzepatide's average weight-loss results. But for most patients starting treatment today, 2.4 mg remains the target the prescriber is titrating towards. How long that takes, and whether a higher dose ever becomes appropriate, is a clinical conversation rather than a patient-side calculation.

Deciding what these numbers mean for you, and where a prescriber fits in

The real decision this keyword often sits behind is something like: am I getting the right dose, and am I using it correctly? That question has a straightforward answer. If you're on Wegovy, your pen's labelled dose is what you're taking. There is no unit dial to adjust. Storing the pen correctly matters far more practically: keeping it in the fridge (not in the door compartment, where temperatures fluctuate) between uses is the standard guidance, though the exact room-temperature window is in your patient information leaflet rather than something to quote from memory.

If you're comparing doses across medicines (say, wondering how milligrams and units convert across different semaglutide products) the maths in this page's opening gives you a reliable starting point. For a broader look at other points on the unit-to-mg scale, the calculation is consistent: divide the unit number by 100 to get milligrams.

What no unit calculation can tell you is whether 2.4 mg is the right dose for you, whether you're progressing at the right pace, or whether any side effects you're experiencing are expected at this stage. Those questions belong with a prescriber. The cost of private Wegovy treatment at a regulated pharmacy includes that prescriber access, not just the pen. Our clinical team reviews every repeat order before it's dispensed; that oversight doesn't stop at the first prescription. If you're considering starting treatment or have questions about where you are in the titration process, speaking to our prescribers is the right first step.