GLP-1 Dose Calculator

Compounded GLP-1 comes as a liquid in a vial with a concentration printed on the label, in milligrams per milliliter. Doses are drawn with a U-100 insulin syringe, whose markings are a volume scale: 100 units is 1 mL, so each unit is 0.01 mL. Converting a dose is one line of arithmetic: divide the dose in mg by the concentration in mg/mL to get milliliters, then multiply by 100 to get units.

The same draw holds a different amount of medication at a different concentration, which is the whole reason the concentration field comes first. 25 units is 2.5 mg from a 10 mg/mL vial and 5 mg from a 20 mg/mL vial. If you were switched to a new vial, a new pharmacy, or a different strength, re-run the number rather than reusing last month's units.

It does not choose or adjust a dose. Dose escalation for these medications follows the label ladder and your prescriber's judgement; the dose chips on the calculator are the label strengths for reference only. It also does not apply to the branded pens: Zepbound, Mounjaro, Wegovy, and Ozempic pens deliver a set dose without any unit conversion, and the Zepbound single-dose vials are drawn in full as their instructions describe.

Compounded GLP-1 products are not FDA-approved, and the FDA has received reports of dosing errors with compounded injections, including confusion between units and milligrams. Those reports are the reason this page exists: check the math, then confirm it with the pharmacy that dispensed your vial. Compounded semaglutide and tirzepatide are a US-only option.

The same label ladder at the concentrations pharmacies most often dispense. Cells over 100 units do not fit a single 1 mL insulin syringe. Read the mg/mL on your own vial and use that column; the calculator above handles any other concentration.

The units are the easy part to lose track of. What matters over a course of treatment is the record: which mg dose you took, on which day, in which injection site, and what happened afterwards. GlucoPal logs compounded tirzepatide and semaglutide by mg dose alongside the branded pens, sends a reminder for the weekly draw, keeps an injection-site rotation map, and turns the history into a doctor-ready PDF for your next appointment.

It is free to download and use, with no account required, and it keeps this calculator company: work out the draw here, log the dose there.

The Zepbound label ladder runs 2.5, 5, 7.5, 10, 12.5, and 15 mg once weekly. At 10 mg/mL those are 25, 50, 75, 100, 125, and 150 units, so the top dose exceeds a 1 mL syringe at that concentration. Pharmacies often dispense higher strengths, commonly 17, 20, or 30 mg/mL, so that every label dose fits one draw: at 20 mg/mL the same ladder is 12.5, 25, 37.5, 50, 62.5, and 75 units.

The tirzepatide dose calculator page has the full table at any concentration, and covers the Zepbound single-dose vials, which are always 0.5 mL and need no conversion.

The Wegovy label ladder is 0.25, 0.5, 1, 1.7, and 2.4 mg once weekly. Compounded semaglutide is usually dispensed at 2.5 mg/mL, where the ladder is 10, 20, 40, 68, and 96 units, so everything fits a 1 mL syringe. At 5 mg/mL each number halves: the 2.4 mg dose becomes 48 units.

Because semaglutide doses are small numbers of milligrams, a units-versus-milligrams mix-up is a large proportional error, which is why the semaglutide dose calculator page spends time on reading the vial label.

The calculator divides the vial's total milligrams by your dose and rounds down. A 30 mg tirzepatide vial holds twelve 2.5 mg doses or six 5 mg doses; a 5 mg semaglutide vial holds twenty 0.25 mg doses or two 2.4 mg doses. At one dose a week that is the number of weeks the vial covers, which is useful for lining up refills before the pharmacy's beyond-use date.

Treat the count as an upper bound. A little medication stays in the needle hub and the vial after the last draw, and a vial that lands exactly on a whole number of doses will usually come up a fraction short on the final one.