Dosing Tool
Peptide Reconstitution & Dosage Calculator
Updated
This calculator converts a vial strength and a bacteriostatic-water volume into a concentration, then converts a dose into the volume it occupies and the mark that volume reaches on an insulin syringe. All three figures come from the numbers entered — vial strength, water volume and dose — and nothing is pre-filled as a suggestion.
Vial strength and water volume give a concentration; a dose then gives the unit mark it corresponds to.
For research purposes only. Always verify calculations independently before use.
Frequently asked questions
What does this calculator compute?
It takes three numbers — a vial's peptide mass, the volume of bacteriostatic water added, and a dose — and returns the resulting concentration in mg/mL, the volume that dose occupies, and the mark that volume reaches on an insulin syringe.
What is reconstitution?
Reconstitution is dissolving a lyophilized (freeze-dried) peptide powder in a liquid so it can be measured by volume. The peptide's total mass does not change; dissolving it makes the same mass measurable with a syringe.
Does the water volume change how much peptide is in the vial?
No. A 5 mg vial holds 5 mg regardless of the water added. What changes is the concentration — milligrams per millilitre — and therefore how many syringe units correspond to a given amount.
What is a syringe unit?
On a U-100 insulin syringe, 100 units is 1 mL, so one unit is 0.01 mL. The calculator converts a draw volume into that scale, which is why the same dose reads as a different number of units at a different concentration.
Why does this page cover every compound rather than one?
The arithmetic is identical for any lyophilized peptide — only the numbers differ. Prof. Peptide also publishes per-compound calculators for the compounds whose vial sizes it tracks across vendors, which work the same math against those specific sizes.