How the calculator works it out
- Enter the strength from your vial label and the dose your prescriber gave you.
- Enter the vial size in mL and how often you inject.
- The page shows how many full doses the vial holds, what is left over, and the date a new vial is needed.
Total mg in the vial = vial size (mL) × strength (mg/mL). Full doses = total mg ÷ dose, rounded down. Example numbers only: a 2 mL vial at 10 mg/mL holds 20 mg, which is 4 full doses of 5 mg.
Dose ↔ units
How long will my vial last?
Uses the vial and dose from the calculator above.
Real vials can hold slightly more or less than the label says, and a little is lost in the needle.
Get the GLP Units app
A phone app for compounded GLP-1 users: vial tracker, injection log and side-effect notes.
Get the GLP Units app: Android first, iPhone later. Join the waitlist and we'll email you at launch.
Questions
Why does my vial seem to last a little longer or shorter than the math?
Vials can hold slightly more or less than the label says, and a little liquid stays in the needle and syringe each time. The calculator counts only full doses from the amount printed on the label.
When do I need a new vial?
Fill in the calculator and the vial section: "New vial needed by" is the date your next dose is due when the vial no longer holds a full dose.