Reconstitution calculator
Enter a vial size, the water added and a target amount to see the concentration, the volume to draw, the units on a U-100 syringe and the draws per vial. The link keeps your numbers. The starting values are an example; change any field to use your own.
- Free tool
- Opens on a worked example
- Link keeps your numbers
- U-100 syringe
Reconstitution, step by step
Vial
The vial holds lyophilized powder.
- Vial contents
- 100 mg
Diluent
Bacteriostatic water is added to the vial.
- Water added
- 2 mL
Mix
Swirl gently until the powder has dissolved. The concentration follows from the vial contents and the water.
- Concentration
- 50 mg/mL
Draw
The volume for the target amount, shown to scale on a U-100 syringe (100 units = 1 mL).
- Target amount
- 250 mcg
- Volume to draw
- 0.005 mL
- Units on a U-100 syringe
- 0.5 units
- Draws per vial
- 400
The numbers follow the calculator above. For laboratory research use only.
Frequently asked questions
How is the concentration of a reconstituted vial calculated?
Divide the vial contents in mg by the water volume in mL. A 10 mg vial with 2 mL of water gives 5 mg/mL. The volume for a target amount is the target in mg divided by that concentration.
What is a unit on a U-100 syringe?
A U-100 syringe has 100 units per mL, so one unit is 0.01 mL. The units figure is the volume in mL multiplied by 100. A 0.3 mL, 0.5 mL and 1 mL syringe hold 30, 50 and 100 units.
What does draws per vial mean?
It is the vial contents in mcg divided by the target amount per draw. It is arithmetic only and ignores any volume left in the vial or needle.
Where do the vial size buttons come from?
They are the sizes in the Pepcore catalogue for the compound. When Pepcore does not sell it, they are the sizes recorded in published sources. A button only fills in the vial size; the target amount is always yours to enter.
Is this calculator for human use?
No. It is arithmetic for laboratory research. The compounds covered on this site are sold for research use only and are not intended for human consumption.
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