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How many vials do I need, and what will it cost?

Enter your vial price, size and dose, or a whole titration. The planner counts vials the way people actually draw them, including leftovers and the use-within limit of a mixed vial.

Optional. Fills vial size, water and use-within from our data.

USD
mg
mL

Optional. Only used for the draw per dose.

days

Optional. Leave empty to plan without a limit.

Dosing
Dose unit

Once a day

weeks

2vials

to cover 56 doses over 8 weeks

Draw per dose5 units0.05 mL on a 1 mL U-100 syringe, 2 mL water
Cost per cycle
$200.00
2 vials × $100
Cost per week
$17.50
Compound used, pro-rata
Cost per dose
$2.50
Compound in one dose
Per dose, with leftovers
$3.57
Cycle cost ÷ doses
Total doses
56
over 8 weeks
Total amount
14 mg
Left over
6 mg
Bought, not used
Pooling floor
2 vials
If remnants were combined

How the vials are counted

Each dose is drawn from one vial, and here that costs nothing extra: 2 vials is also the floor you would get by pooling every remnant. You end with 6 mg unused.

Two costs per dose

$2.50 is the compound one dose uses, at your vial price. $3.57 is what you actually pay divided by the number of doses, so it carries the leftovers too.

How the planner counts vials

Most cost calculators divide the total amount by the vial size and call it done. That number is a floor, and it is rarely what you end up buying. This planner counts the way people actually draw:

  • Each dose comes from one vial. When the open vial holds less than your next dose, that rest is left over and a new vial opens.
  • Only a dose bigger than a whole vial gets pooled. It takes what is left in the open vial plus as many new vials as it needs. Every other phase of the same plan keeps one vial per dose.
  • A use-within limit retires vials early. A mixed vial serves doses for that many days after its first draw. Whatever is still in it after that is thrown out.
  • Doses are counted per phase. Times per day or per week multiply by the weeks. Every N days starts with a dose on day one, so every 3 days for 4 weeks is 10 doses.

The pooling floor is still shown next to every result, so you can see exactly what single-vial draws and use-within limits cost you.

Worked example: a titration

Take a weekly titration that steps through 2, 4, 6, 8, 10 and 12 mg, 4 weeks per step, on 10 mg vials. That is 24 doses and 168 mg in total. Divide by 10 mg and you get 17 vials.

The planner says 20 vials. The difference is the remnants: as the dose climbs, each vial ends with a little that the next dose no longer fits into. The 12 mg step is bigger than one vial, so only that step pools. You finish with 32 mg unused.

Why use-within matters

A low dose can outlast the mixed vial. 1 mg once a week for 12 weeks on 10 mg vials uses 12 mg, which is 2 vials by content. With a 28-day limit it is 3 vials, 1 vial more, because each vial is retired before small weekly doses can empty it. A smaller vial size often fixes that for less money.

How long is a mixed vial good for? For Retatrutide, the storage guides we track say about 28 days (community-reported). Pick a compound and the planner fills in the window from its storage data. Clear the field if you follow a different rule.

Cost per dose, two ways

Cost per dose is the share of a vial one dose uses, at your price. On the titration above at $100 a vial that is $70.00. Per dose, with leftovers divides what you actually pay by the number of doses: $83.33. The second is your real budget number. The first is what the compound itself costs.

The planner uses the price you type. It does not list, rank or compare vendor prices.

Sources

  1. Retatrutide peptide page, PeptIQ
  2. Retatrutide beginner's guide: reconstitution and dosing, PeptIQ
  3. Retatrutide Protocol, Peptide Dosing Protocols