Peptide Reconstitution Planner
Two things you already know — what the vial says, and the dose you need. It returns ready-made plans in millilitres and syringe marks.
Before you mix: confirm which solvent this peptide needs — its product page or Certificate of Analysis says. Most take bacteriostatic water; some need dilute acid. Set it under Reconstituted with, below.
The number printed on the label.
Per injection.
It need not be a round number.
See every volume
| Liquid | Concentration | Per dose | Draw to | Per mark | Doses |
|---|
More options
A standard peptide vial is 5 mL. Change it only if yours differs.
For compounds dissolved in a small volume of solvent first and then brought up to volume with bacteriostatic water. Leave at 0 for a single solvent.
For co-lyophilised blends. Leave at 0 for a single peptide.
How this calculator works
Why all the plans give the same number of doses
Doses per vial depend only on the vial strength and the dose size — never on the volume of liquid. A 10 mg vial gives five 2 mg doses whether you add 1 mL or 5 mL. The solvent decides only how far along the barrel one dose sits, so a more dilute vial is easier to measure, not weaker.
How the plans are chosen
- Whole marks. 40 is read at a glance; 13.3 is guesswork.
- Enough marks. Under about five, one mark of misreading is a large share of the dose.
- Room in the barrel. Drawing to the very top is awkward and easy to overshoot.
Each plan names the trade-off it makes so you can pick on your own terms.
Not every peptide dissolves in water
Bacteriostatic water suits most, but some compounds are poorly soluble at neutral pH and are dissolved in a small volume of dilute acid first, then brought up to volume. Which solvent a given peptide needs is a property of that compound, not something this tool decides — take it from the product documentation or the Certificate of Analysis. The arithmetic is unaffected either way: concentration is mass divided by total volume, whatever the liquid is.
Marks are not IU
A syringe mark is a fixed volume — 0.01 mL on any U-100 barrel, 0.025 mL on a U-40. An IU measures biological activity, and its conversion to milligrams differs for every compound. This tool never converts between the two: an IU vial stays in IU throughout.
The arithmetic
concentration = vial ÷ total volumevolume per dose = dose ÷ concentrationmarks = volume per dose × 100doses = vial ÷ dose
Every plan opens to show these worked with your own numbers.
Worked examples
The calculator does not know what is in the vial. It works from two numbers: the strength printed on the label, and a dose you already have. Below is what it returns for the vial strengths people bring to it most often. Every row is a calculation, not a recommendation.
| Vial | Dose entered | Water to add | Concentration | Marks on U-100 | Doses per vial |
|---|---|---|---|---|---|
| 5 mg | 250 mcg | 3 mL | 1.667 mg/mL | 15 | 20 |
| 10 mg | 500 mcg | 3 mL | 3.333 mg/mL | 15 | 20 |
| 10 mg | 2 mg | 2 mL | 5 mg/mL | 40 | 5 |
| 15 mg | 2.5 mg | 3 mL | 5 mg/mL | 50 | 6 |
| 30 mg | 5 mg | 3 mL | 10 mg/mL | 50 | 6 |
| 5000 IU | 250 IU | 3 mL | 1666.7 IU/mL | 15 | 20 |
Each row shows the plan the calculator marks recommended. For the same two numbers it also returns a least-water plan and a finest-measurement plan, and every one of them yields the identical number of doses — water changes only how far along the barrel a dose sits.
Compounds people bring to this calculator
Search traffic for reconstitution arithmetic clusters around a handful of names — tirzepatide, semaglutide, retatrutide, BPC-157, TB-500, Semax, Epithalon, DSIP, HCG. None of them changes the calculation. Concentration is mass divided by total volume whatever the molecule is, so a 10 mg tirzepatide vial and a 10 mg BPC-157 vial produce identical numbers at the same dose. Only two things vary by compound: which solvent it needs, and whether its label is printed in milligrams or International Units. Both are read off the vial, not inferred by this tool.
Vial strengths differ between suppliers, so use the figure on your own label rather than a strength quoted online. Generic Peptides lists semaglutide, tirzepatide and retatrutide as laboratory research products; links to their product pages are below. The calculator uses only the numbers you enter and does not recommend a dose or determine solvent compatibility.
Where to go next
Featured research compounds
For laboratory research only. Check the label for the vial strength and the product documentation for handling details.
Research reading
Browse the catalog
- Anti-Aging & Longevity
- Growth Hormone & IGF-1
- Fat Loss & Metabolism
- Muscle Recovery & Regenerative
- Cognitive & Neurological
- Sexual Health & Libido
- Reproductive & Endocrine
- Blended & Multi-Function
- Cosmetic & Skin
- Browse every peptide
Each product page opens this calculator with its vial strength already filled in.
This tool converts units. It does not recommend doses. Every figure it returns is arithmetic performed on numbers you entered — the strength printed on your vial and a dose obtained elsewhere. Generic Peptides does not supply dosing or usage protocols. All products are sold for laboratory research use only and are not for human consumption. Check the label and your own arithmetic before acting on any result.