Free tool
GLP-1 supply duration calculator
How long pens or vials last and when to reorder before run-out.
Arithmetic only, not medical advice. Follow your prescriber and pen/vial label.
Supply duration
How long your pens or vials last before refill, pick what matches your pharmacy box.
Ozempic, Mounjaro KwikPen, pick doses per pen below (not mg on the box)
mg
Prescription amount per injection, e.g. 7.5 mg
How much is in one pen?
Most people know whether they get one pen per week or about a month per pen, not total milligrams. Pen label (e.g. 7.5 mg) is often your weekly dose, not the whole cartridge.
Doses in one pen
One pen ≈ 4 injections at 2.5 mg (10 mg total)
days
Pharmacy lead time, order this many days before you run out
4weeks
4 doses from one pen (10 mg)
Total doses
4
Runs out
6 Sep 2026
Reorder by
30 Aug 2026
7 days before run-out (6 Sep 2026)