Tools

Vial Usage Planner

Plan your peptide supply. Enter your vial size, dose, and frequency to see how many doses you get per vial, how long each vial lasts, and how many vials you need per month.

Quick presets

Vial content

Dose per administration

mcg

Frequency mode

Doses per week

×/wk

Wastage (optional)

Days of supply per vial

days

Doses per vial

doses

Vials per month

vials

Monthly consumption

15.0

mg/month

Show the math›

Doses per vial: floor((5.00 mg × 1000) ÷ 250 mcg) = 20

Doses per week: 14 (input)

Days per vial: floor(20 ÷ (14.00 ÷ 7)) = 10

Vials/month: ceil(14.00 × (30 ÷ 7) ÷ 20) = 3

Monthly mg: 14.00 × (30 ÷ 7) × 250 mcg ÷ 1000 = 15.00 mg

Assumptions

Monthly = 30 days (4.286 weeks)
Doses per vial uses floor rounding (partial doses are not counted)
Wastage accounts for dead volume in vials and syringes
Actual supply may vary based on reconstitution precision and injection technique

How This Calculator Works

Flow diagram showing how the vial usage planner works — Vial planning flow — from single dose to full cycle supply

The planner divides your vial's usable content by your per-dose amount to find doses per vial. It then combines your dosing frequency to project how many days each vial covers and how many vials you need per month. An optional wastage factor reduces usable content to account for real-world losses.

Assumptions & Limitations

Monthly is defined as 30 days (4.286 weeks). Actual months vary from 28 to 31 days.
Partial doses are not counted — the calculator uses floor rounding for doses per vial.
Wastage is user-estimated. Actual waste depends on syringe dead volume, technique, and vial overfill.
Once reconstituted, peptides have a limited shelf life (typically 4–8 weeks refrigerated). Plan accordingly if doses per vial is very high.

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Frequently Asked Questions

How many doses can I get from one vial?

Divide the vial content (in mg) by your dose (in mg). For example, a 5 mg vial with a 250 mcg (0.25 mg) dose yields 5 / 0.25 = 20 doses. The calculator uses floor rounding because partial doses are not practical.

What is the wastage percentage for?

When reconstituting and drawing from a vial, some peptide is inevitably lost to dead volume in the syringe, overfill in the vial stopper, and reconstitution technique. A 5–10% wastage factor provides a more realistic estimate. Set it to 0% for the theoretical maximum.

Should I use "times per week" or "every N days"?

Both produce the same result. Use whichever matches how you think about your schedule. "Times per week" is easier for daily or twice-daily protocols. "Every N days" is better for weekly or bi-weekly injections (e.g., semaglutide every 7 days).

How does this differ from the cost calculator?

The vial usage planner focuses purely on supply logistics — how long your vials will last and how many you need. It does not require pricing information. Use the cost calculator when you also want to estimate dollar costs.

Educational Use Only

This planner is provided for informational and budgeting purposes. It is not medical advice. Actual vial yields depend on reconstitution technique, storage conditions, and injection precision. The Peptide Effect does not sell peptides or endorse any specific vendor.

Last reviewed: February 2026