Short answer

Cost = vials × price, where vials = ceil(total mg ÷ vial mg). Example: 8 mg weekly for 4 weeks is 32 mg; 10 mg vials at $100 means 3.2 vials, so 4 vials and $400 ($320 if the partial vial carries over), or $10 per mg. You enter the price; as of Oct 19, 2026.

$100 is a round example, not a market price. GLP Ladder lists no sellers.

Cost, whole vials
$300.00
Vials needed
3 (2.76 exact)
Total amount
13.8 mg
Cost if partial vial carries over
$276.00
Average per 4 weeks
$69.00
Per mg
$20.00
Weekly amounts: Wegovy label ladder to 2.4 mg, 16 weeks, 5 mg vials at $100 (example)
Weeksmg per weekmg in block
1–40.251
5–80.52
9–1214
13–161.76.8

13.8 mg ÷ 5 mg per vial = 2.76 vials → 3 whole vials × $100 = $300.00.

Math, parameters and sources: model card.

How the cost math works

The calculator adds up every weekly amount in the period, divides by the vial size and rounds up to whole vials. It also reports the fractional number of vials, which is the fairer average when a partly used vial carries into the next period. Cost per mg is the price divided by the vial size. For brand pens priced per fill, the fill price is the monthly cost; see the dated savings guides for Wegovy and Ozempic.

Frequently asked questions

How much does semaglutide cost per month?

It depends on the product and coverage. Manufacturer self-pay and savings-card prices change often; see the dated Wegovy and Ozempic savings guides. For mg-based vials, enter your price to compute cost per month and per mg.

How many mg is the Phase 3 retatrutide ladder over 16 weeks?

The published 12 mg arm steps 2, 4, 6 and 9 mg, four weeks each, before 12 mg. Over those first 16 weeks that totals 4 × (2 + 4 + 6 + 9) = 84 mg. The calculator adds up any ladder the same way.

Why are whole vials and fractional vials different?

Whole vials are what you would need to have on hand for the period (rounded up). The fractional figure assumes the partial vial carries into the next period, which gives the true average cost per period.

Does the calculator include vendor prices?

No. Prices are your input only. GLP Ladder lists no sellers and prefills no prices, so the result is only as good as the number you type.

Is semaglutide FDA approved?

Yes. FDA approved as Ozempic (type 2 diabetes) and Wegovy (weight management, cardiovascular risk reduction). Numbers on this page quote the FDA prescribing information; your prescriber sets your dose.

Sources

  1. WEGOVY (semaglutide) injection, for subcutaneous use; WEGOVY (semaglutide) tablets, for oral use - Full Prescribing Information (SPL, Revised 6/2026). Novo Nordisk / National Library of Medicine DailyMed, Jun 18, 2026. Accessed Oct 19, 2026.
  2. OZEMPIC (semaglutide) injection, for subcutaneous use - Full Prescribing Information (SPL). Novo Nordisk / National Library of Medicine DailyMed, Jun 1, 2026. Accessed Oct 19, 2026.
  3. Price your Wegovy®. Novo Nordisk (NovoCare), Oct 19, 2026. Accessed Oct 19, 2026.