Peptide reconstitution calculator
Turn the amount in your vial, the bacteriostatic water you add and your prescribed dose into units on an insulin syringe.
Updated
A unit converter, not a dosing guide. Check every number with your clinician or pharmacist.
Concentration table
Common vial and water combinations, worked out. One unit on a U-100 syringe is 0.01 mL.
| In the vial | Water added | Concentration | Per unit (U-100) |
|---|---|---|---|
| 2 mg | 1 mL | 2 mg/mL | 20 mcg |
| 2 mg | 2 mL | 1 mg/mL | 10 mcg |
| 2 mg | 3 mL | 0.667 mg/mL | 6.7 mcg |
| 5 mg | 1 mL | 5 mg/mL | 50 mcg |
| 5 mg | 2 mL | 2.5 mg/mL | 25 mcg |
| 5 mg | 3 mL | 1.667 mg/mL | 16.7 mcg |
| 10 mg | 1 mL | 10 mg/mL | 100 mcg |
| 10 mg | 2 mL | 5 mg/mL | 50 mcg |
| 10 mg | 3 mL | 3.333 mg/mL | 33.3 mcg |
The numbers above only show the arithmetic. They are not a recommendation.
How to calculate peptide reconstitution
Concentration
Amount in the vial ÷ water added = mg per mL. For example, 5 mg in 2 mL is 2.5 mg/mL.
Volume to draw
Your dose ÷ concentration = mL. 0.25 mg ÷ 2.5 mg/mL = 0.1 mL.
Syringe units
On a U-100 insulin syringe, 1 mL is 100 units, so mL × 100 = units. 0.1 mL is 10 units.
Doses per vial
Amount in the vial ÷ your dose. 5 mg ÷ 0.25 mg = 20 doses.
The numbers above only show the arithmetic. They are not a recommendation.
Do this once, then let PepLabo remember it.
In the app the calculator fills your vial, so every logged dose lowers the level and the estimate of doses left updates on its own.
Questions
How many units is 0.1 mL on an insulin syringe?
On a U-100 insulin syringe, 0.1 mL is 10 units, because 1 mL equals 100 units.
How many units are in 1 mL, 0.5 mL and 0.3 mL syringes?
On U-100 insulin syringes, a 1 mL syringe holds 100 units, a 0.5 mL syringe holds 50 units and a 0.3 mL syringe holds 30 units. The unit size is the same in all three.
What is bacteriostatic water?
Sterile water with a small amount of benzyl alcohol that limits bacterial growth, commonly used to reconstitute powders in multi-dose vials. Ask your pharmacist which water to use.
Does adding more water change the dose?
No. More water lowers the concentration, so you draw more volume for the same dose. The amount of the substance stays the same.
Does PepLabo tell me what dose to take?
No. The calculator only converts the numbers you enter. Your dose should come from your clinician.
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