Educational only — not medical advice. This page compares medicine costs only, from prices you enter yourself. It does not recommend a product, a dose or a switch, and it contains no affiliate links, no seller links and no pre-filled drug prices. Medically reviewed by Dr. Taimoor Asghar.
For each option, enter: a name you choose (for example, the product and dose on your quote), the pack price in your own currency, how many injections that pack provides, and how many injections per week that option involves (usually 1 for these weekly injections). The calculator shows cost per injection, cost per week, cost per 4 weeks, cost per calendar month and cost per year, using the same formula for every option so the comparison is like-for-like.
Fill in at least two options with real prices, then compare.
The formula is deliberately boring, so it can be checked on a phone calculator. Cost per injection equals pack price divided by injections per pack. Weekly cost equals cost per injection multiplied by injections per week. Cost per 4 weeks equals weekly cost multiplied by 4. Cost per calendar month equals weekly cost multiplied by 52 and divided by 12 — that is, about 4.333 weeks per month, which is the average month over a year — and annual cost equals weekly cost multiplied by 52. Two common errors are worth naming. First, comparing pack prices directly without dividing by injections per pack: a pack with 4 injections is not comparable with a pack with 1 injection until both are reduced to cost per injection. Second, treating a month as exactly 4 weeks: that understates a year by about a month (48 weeks instead of 52), which is why this page shows both the 4-week figure and the calendar-month figure side by side. If your pharmacy quotes a 28-day price, use the 4-week column; if you are budgeting by calendar month, use the monthly column; never mix the two in one comparison.
A price comparison answers a budgeting question, not a medical one. Semaglutide and tirzepatide are different molecules with different label schedules, different maintenance doses and different indications: Ozempic is labelled for type 2 diabetes, Wegovy injection for weight reduction and cardiovascular risk reduction (and, in adults, noncirrhotic metabolic dysfunction-associated steatohepatitis with moderate to advanced fibrosis), Mounjaro for type 2 diabetes, and Zepbound for weight reduction and for moderate-to-severe obstructive sleep apnoea in adults with obesity. Their milligrams are not interchangeable, so a lower cost per milligram — or a lower cost per injection — across molecules compares unlike with unlike. The only like-for-like cost comparison is between two quotes for the same product at the same dose, or between two pack sizes of the same product at the same dose. Even then, tolerability, response, other medicines, pregnancy plans, and the boxed warning and contraindications on each label (including personal or family history of medullary thyroid carcinoma or MEN 2) all sit outside any price table and belong in the clinical conversation. Never start, stop or switch a GLP-1 medicine because a comparison page made another option look cheaper.
This calculator compares pack medicine costs only. It excludes consultation fees, needles and sharps disposal, travel, time off work, laboratory monitoring, and the cost of managing side effects, because those figures are personal and cannot be honestly pre-filled. It also does not model insurance coverage, deductibles, discount programmes, savings cards or copay assistance: those can change the amount a household actually pays far more than the pack price does, and they change by plan and by year. If you have a copay figure or a post-discount price from your insurer or pharmacy, enter that figure as the pack price and note what it represents — the arithmetic stays the same, but the label on the number is yours to keep honest. The same honesty applies to dose changes: during titration the dose — and therefore the pack you need — changes every 4 weeks, so a single monthly figure only becomes stable once you are on a maintenance dose. Comparing a titration month with a maintenance month, or a starter pack with a maintenance pack, will mislead; compare maintenance with maintenance, and treat titration months as transitional.
Compounded semaglutide and compounded tirzepatide are not FDA-approved, are not reviewed by the FDA for safety, quality or effectiveness, and must not be presented as approved alternatives. A lower compounded price is therefore not a like-for-like saving against an approved product: the products differ in regulatory status, quality oversight and labelling, and there is no FDA-approved dosing schedule for a compounded product. This page contains no links to compounded sellers or to telehealth sign-ups for compounded products, and no affiliate links of any kind, because a price tool that funnelled readers toward a seller would stop being a neutral calculator. If a quote you receive is for a compounded product, make sure you know that distinction before you compare its price with anything else — and discuss it with your prescribing clinician and pharmacist, not with a checkout page.
Bring three things to your prescriber or pharmacist: the quotes themselves (with pack size, dose and what the price includes), this page's monthly and annual figures worked from those quotes, and the list of what the comparison does not include. Ask which costs outside the pack price apply in your case, whether a different pack size of the same product at the same dose changes the per-injection cost, and what happens to cost and supply if your dose changes. Keep the dose decision and the budget decision in separate conversations: decide the medicine with your clinician first, then use this calculator to budget for the medicine you were actually prescribed. That order protects both decisions — the clinical one from price pressure, and the financial one from invented numbers.
Sources checked 24 October 2026. If a label has since been revised, the revised label governs. Prices on this page are only those you enter; none are supplied, endorsed or updated by this site.