Reconstitution Calculator
Reconstitution, solved
Lyophilised vials arrive dry. This works out what the solution becomes once you add diluent — its concentration, the volume of one draw, and where that lands on an insulin syringe.
Inputs
Optional — fills in the vial strength for you.
Total peptide in the vial, in milligrams.
mg
How much peptide each draw should contain.
mcg
The diluent volume you reconstitute the vial with.
mL
Syringe size
Sets the scale on the barrel below.
Result
Live- Concentration
- 5 mg/mL
- Peptide per millilitre of solution
- Draw volume
- 0.1 mL
- 1 mL = 100 units = 1 cc
- Draws per vial
- 20
- Whole draws at this amount
- Per syringe unit
- 50 mcg
- Peptide in each 0.01 mL graduation
Reference arithmetic only. Verify every figure independently before relying on it. VAULT products are supplied for laboratory research use and are not for human or veterinary administration — nothing here is dosing guidance.
How the arithmetic works
Everything above comes from one number: concentration. Divide the peptide in the vial by the volume of bacteriostatic water you add, and you have milligrams per millilitre. Every other figure follows from it.
- Concentration = vial strength ÷ diluent volume
- Draw volume = amount wanted ÷ concentration
- Syringe units = draw volume × 100
- Draws per vial = vial strength ÷ amount wanted
The diluent volume is a free choice, and it is a trade-off rather than a correct answer. Less water gives a concentrated solution where a draw is only a unit or two — quick, but a small misread costs proportionally more. More water spreads the same peptide across a longer stretch of the barrel, which is easier to read accurately and uses more of the vial's shelf life once it is wet.
Worked example
- Vial strength
- 10 mg of lyophilised peptide
- Diluent added
- 2 mL of bacteriostatic water
- Concentration
- 10 ÷ 2 = 5 mg/mL
- Amount wanted
- 500 mcg, i.e. 0.5 mg
- Draw volume
- 0.5 ÷ 5 = 0.1 mL
- On the barrel
- 0.1 mL × 100 = 10 units
Reference conversions: 1 mL = 100 units = 1 cc · 1 unit = 0.01 mL · 1 mg = 1000 mcg.