Peptide reconstitution calculator
A lab reconstitution calculator for peptide vials. Enter the vial size, the bacteriostatic water added and the amount to measure to get the syringe units, the mL per draw, the concentration and the draws per vial. Works for U-100 and U-40 insulin syringes, in mg or mcg.
10 mg ÷ 2 mL = 5 mg/mL · 2 mg ÷ 5 mg/mL = 0.4 mL · × 100 units/mL = 40 units
This calculator is for research purposes only.
Reconstitution questions
How do I calculate peptide syringe units?
Divide the peptide in the vial (mg) by the water added (mL) to get the concentration in mg per mL. Divide the amount to measure (mg) by that concentration to get the volume in mL. On a U-100 insulin syringe, 1 mL is 100 units, so multiply the mL by 100. The PepAssess calculator does all three steps and shows the working.
How many units is 2 mg from a 10 mg vial mixed with 1 mL of water?
20 units on a U-100 syringe. 10 mg ÷ 1 mL = 10 mg/mL, and 2 mg ÷ 10 mg/mL = 0.2 mL, which is 20 units. The vial holds 5 draws of 2 mg.
How many units is 250 mcg from a 5 mg vial mixed with 2 mL of water?
10 units on a U-100 syringe. 250 mcg is 0.25 mg; 5 mg ÷ 2 mL = 2.5 mg/mL, and 0.25 mg ÷ 2.5 mg/mL = 0.1 mL, or 10 units. The vial holds 20 draws of 250 mcg.
How many units is 2.5 mg from a 10 mg vial mixed with 2 mL of water?
50 units on a U-100 syringe (0.5 mL at 5 mg/mL). The vial holds 4 full draws of 2.5 mg.
What is the difference between a U-100 and a U-40 syringe?
A U-100 insulin syringe is marked 100 units per mL; a U-40 syringe is marked 40 units per mL. The same volume reads differently: 0.2 mL is 20 units on a U-100 syringe and 8 units on a U-40 syringe. Check the label on the syringe and pick the matching one in the calculator.
Does the amount of bacteriostatic water change the amount per draw?
No. The water only changes the concentration, not how much peptide is in the vial. More water means a larger volume for the same amount: 0.25 mg from a 10 mg vial is 2.5 units with 1 mL of water and 7.5 units with 3 mL, which is easier to read on the syringe.
How many mcg are in a mg?
1 mg is 1,000 mcg (micrograms). 250 mcg is 0.25 mg and 500 mcg is 0.5 mg. The calculator switches between mg and mcg and converts the amount for you.
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