Peptide Calculator: Free Peptide Reconstitution Calculator
Work out the concentration of a reconstituted peptide vial, the amount held in every syringe graduation and the volume for a target amount. A laboratory calculation only, not dosing guidance.
Laboratory calculation only, not dosing guidance. For the measured content of your lot, use the figure on its certificate of analysis.
How the Peptide Calculator Works Online
The calculator takes three numbers: the amount of peptide printed on the vial label in milligrams, the volume of bacteriostatic water added in millilitres, and, if you need it, a target amount in micrograms. From these it returns the concentration of the solution, the amount held in each graduation of a U-100 insulin syringe, the volume to draw for the target amount, and how many draws of that size the vial holds. Change any number and every result updates at once.
Peptide reconstitution calculator: the formula
The arithmetic behind the tool is short, and it is worth knowing so a result can be checked by hand.
- Concentration in mg per mL equals the peptide in the vial divided by the water added
- Micrograms per mL is that figure multiplied by 1,000
- One unit on a U-100 syringe is 0.01 mL, so micrograms per unit is micrograms per mL divided by 100
- Volume for a target amount is the target in micrograms divided by micrograms per mL
- Syringe units for that volume are the volume in mL multiplied by 100
Peptide calculator worked examples for vials sold in Australia
- A 10mg vial with 2 mL of water gives 5 mg per mL, or 50 mcg in every unit, so a 250 mcg target is 5 units
- A 5mg vial with 2 mL gives 2.5 mg per mL, or 25 mcg per unit, so the same target is 10 units
- A 50mg GHK-Cu vial with 5 mL gives 10 mg per mL, or 100 mcg per unit
- Retatrutide 30mg with 3 mL: 10 mg/mL
Record the water volume on the vial label as soon as it is added, because every later calculation depends on it.
Peptide calc tips: choosing a water volume
More water means a weaker solution, and a weaker solution spreads a small target amount over more graduations, which makes it easier to measure precisely on a small syringe. Less water keeps the volume per draw low. A common approach is to pick the volume that puts the usual target between 5 and 20 units on the syringe in use, and to check that the largest draw still fits within the barrel. The bacteriostatic water page covers the 3, 10 and 30 mL sizes.
Peptides calculator for the insulin syringes we stock
Insulin syringes on the U-100 scale come in three common barrels: 0.3 mL holding 30 units, 0.5 mL holding 50 units and 1 mL holding 100 units. Every unit is 0.01 mL whatever the barrel size, so the calculator result reads the same on each, and the smaller barrels simply give finer spacing between marks. The calculator warns when a draw is larger than the barrel selected.
Buy reconstitution supplies online in Australia
The calculator pairs with the consumables in our lab supplies range: bacteriostatic water, acetic acid for peptides that resist neutral water, insulin syringes in packs of 20 and 100, and alcohol swabs. A starter kit puts a peptide vial together with the water, syringes and swabs in one box, dispatched from Australia.
Reconstitution calculator accuracy and limits
The tool assumes the vial holds the amount printed on its label and that the powder dissolves completely. Your lot's certificate of analysis states the measured content, so for the most exact figures, use that value in place of the label amount. For blends, entering the total fill gives the combined concentration; enter the labelled amount of one component to see its share. The calculator is a laboratory aid only and gives no dosing advice.