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Cost per month and per mg

Enter a price, the total milligrams in the container and your weekly dose for up to four options, and compare cost per mg, per dose, per month (52/12 weeks) and per year. No prices are built in.

By FormBlends editorial teamAssumptions checked September 4, 2026Runs in your browser; nothing is sent to a server

Options to compare

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A "container" is whatever you pay for at once: one vial, one pen, or one month's supply. For a pen, mg per container is the total drug in the pen, not the dose per click.

Comparison

Enter a price, the total mg in the container, and your weekly dose for at least one option. No prices are pre-filled; use your own quotes.

For dated brand and program prices with sources, see the FormBlends GLP-1 cost report.

Formulashown in full, nothing hidden
cost per mg          = price per container / mg per container
cost per dose        = cost per mg x weekly dose (mg)
mg per month         = weekly dose x 4.3333        (52 weeks / 12 months)
containers per month = mg per month / mg per container   (rounded up in whole-container mode)
monthly cost         = containers per month x price per container
annual cost          = monthly cost x 12

Whole-container mode reflects what you actually pay when a container cannot be bought in fractions and any remainder expires before use. Exact mode is the fair per-mg comparison.

Assumptions, checked September 4, 2026

  • A month is 52/12 = 4.333 weeks. Quoting 4 weeks per month understates annual cost by about 7.7 percent.
  • No prices are built in. Enter the amounts from your own quotes, including any consultation, shipping or membership fees you want to spread across the month.
  • Waste from priming, draw-up loss and expired remainders is not modelled in exact mode. Whole-container mode captures expired remainders only.
  • Titration changes the weekly dose and therefore the monthly cost; run the tool per step if you want a month-by-month figure.
  • Compounded products are not FDA approved and are priced by the pharmacy, not by a list price.

This calculator is an arithmetic aid for medication a licensed prescriber has already prescribed. It does not recommend a dose. Confirm any result with your prescriber or pharmacist before use.

Sources

  1. GLP-1 cost report 2026
  2. FDA: Human Drug Compounding (overview of 503A and 503B, and the statement that compounded drugs are not FDA approved)

Read before you use it

Guides for this calculator

Cost per mg: comparing quotes that are written differently

How to normalise a per-vial price, a per-month program and a per-pen list price onto one scale, why a month is 4.33 weeks, and where waste hides in the comparison.

Updated September 4, 2026

Educational, not medical advice. Read the medical disclaimer.