Calculator
Peptide Vial Duration Calculator
Find out how long a vial lasts and how many you need. Enter the vial size, your dose, and doses per week — add a cycle length to get the number of vials required.
Enter your numbers and press Calculate — the result appears here.
How it's calculated
- Doses per vial = vial mcg ÷ dose (rounded down)
- Weeks per vial = doses per vial ÷ doses per week
- Vials for cycle = ceil(cycle weeks × doses per week ÷ doses per vial)
Worked example — A 5 mg vial at a 250 mcg dose holds 20 doses. At 2 doses a week it lasts 10 weeks, so an 8-week cycle needs just 1 vial.
Frequently asked questions
How long will one peptide vial last?
Divide the doses per vial by how many doses you take per week. A 5 mg vial at a 250 mcg dose holds 20 doses, so at 2 doses a week it lasts about 10 weeks.
How many vials do I need for a cycle?
Multiply the cycle length in weeks by doses per week to get total doses, then divide by doses per vial and round up. An 8-week cycle at 2 doses a week needs 16 doses, which is 1 vial of 20.
Is this vial duration calculator medical advice?
For informational and educational purposes only. Not medical advice. Peptides are sold for research use only. Consult a licensed healthcare professional before use.
For informational and educational purposes only. Not medical advice. Peptides are sold for research use only. Consult a licensed healthcare professional before use.