How long will a peptide vial last? Vial duration calculator
Divide the vial strength by your dose to get the number of doses in the vial, then divide by how many doses you take each week to get how many weeks it lasts. A 10 mg vial at 500 mcg per dose holds 20 doses; at five doses a week that is four weeks.
The formula
- Doses per vial
- vial strength ÷ dose
- Weeks of supply
- doses per vial ÷ doses per week
- Cost per dose
- vial price ÷ doses per vial
Worked example
- A 10 mg vial is 10,000 mcg.
- At 500 mcg per dose: 10,000 ÷ 500 = 20 doses.
- At 5 doses a week: 20 ÷ 5 = 4 weeks.
- If the vial cost $60, each dose costs 60 ÷ 20 = $3.
Common questions
How many doses are in a 5 mg vial?
Divide 5,000 mcg by your dose in mcg. At 250 mcg per dose a 5 mg vial holds 20 doses; at 500 mcg it holds 10.
Does the amount of water added change how long a vial lasts?
No. The number of doses depends on the vial strength and the dose size. The water only changes the volume of each dose.
Is the supply date the same as the expiration date?
No. This calculator shows when the vial would be empty. A reconstituted vial may reach the end of its usable period first, so check the label or ask your pharmacist.
Other calculators
-
Peptide reconstitution calculator
Vial strength, water added and dose in; concentration and syringe units out.
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mcg to units converter
Switch between mcg, mg, mL and syringe units at any concentration.
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Bacteriostatic water calculator
How much water makes your dose land on a round number of units.
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Tirzepatide and semaglutide units calculator
Turn a prescribed mg dose into units, using the concentration on your vial.
Keep the numbers with your log
Record each vial's strength and status in PepVault, next to every dose you log. Free for Android, iPhone, iPad and Mac.
For Android, iPhone, iPad and Mac. On the App Store the app is listed as PeptideMate.