Reconstituting a vial means turning three numbers into one: how many units to draw on your syringe. This calculator does that conversion. Enter the peptide mass in your vial, the bacteriostatic water you plan to add, and your target dose. It returns the concentration, the draw volume, the syringe mark to draw to, and how many doses the vial yields.
Peptide Reconstitution Calculator
Work out concentration, draw volume, and syringe units for your reconstituted vial.
This calculator is provided for laboratory reference only. ENCODE Peptides Bali supplies compounds strictly for research use. Nothing here constitutes medical advice or dosing guidance for humans or animals.
How to Use the Peptide Dosage Calculator
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Enter the peptide mass
Read it from the vial label. A vial marked 5mg holds 5mg of lyophilised powder regardless of how the vial looks, since freeze-dried peptide often forms a thin film rather than a visible volume.
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Enter your bacteriostatic water volume
This is your choice, not a fixed property of the peptide. More water produces a weaker concentration and a larger draw volume. Less water produces a stronger concentration and a smaller draw.
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Set your target dose
Switch between micrograms and milligrams with the dropdown. The stepper moves in 10mcg increments.
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Pick your syringe
The calculator flags a dose that exceeds the barrel capacity of the syringe you selected.
Read the result under “Draw to this mark.” That number is the graduation on your insulin syringe.
Peptide Reconstitution Formula Explained
Two divisions produce the answer.
Concentration (mg/ml) = peptide mass (mg) ÷ water volume (ml)
A 5mg vial reconstituted with 2ml of bacteriostatic water gives 2.5mg/ml.
Volume (ml) = dose (mg) ÷ concentration (mg/ml)
A 250mcg dose is 0.25mg. Divided by 2.5mg/ml, that gives 0.1ml.
The water volume is the variable you control. Choosing it well matters more than most people expect: it determines whether your dose lands on a readable syringe mark or falls between graduations where you cannot measure it.
Converting mg to Insulin Syringe Units
Insulin syringes carry 100 graduation marks per millilitre. This holds for every barrel size:
| Syringe | Capacity | Marks | Marks per ml |
|---|---|---|---|
| 100 IU | 1.0 ml | 100 | 100 |
| 50 IU | 0.5 ml | 50 | 100 |
| 30 IU | 0.3 ml | 30 | 100 |
A 50 IU syringe is not a half-scale instrument. It is a shorter barrel with the same spacing between marks. So the conversion never changes:
Units = volume (ml) × 100
A 0.1ml draw reads as 10 units on all three syringes. The syringe size determines only the maximum you can draw in one go.
Worked example
A 10mg vial with 2ml of bacteriostatic water gives 5mg/ml. A 500mcg dose needs 0.1ml, which reads as 10 units. That vial yields 20 doses.
Choosing Your Water Volume
Nothing forces a specific water volume, but two boundaries are worth respecting.
Below 2 units, precision collapses
A draw of 1.5 units sits between marks on the barrel. Add less water next time to concentrate the solution and push the draw into a readable range.
Above the barrel capacity, you cannot draw in one pass
A dose needing 120 units will not fit a 100 IU syringe. Add more water, split the draw, or move to a larger syringe.
The comfortable zone falls between 10 and 50 units, where each graduation is legible and small errors stay small.
Frequently Asked Questions
Does the peptide powder add to the volume?
The mass of lyophilised peptide is small enough that its contribution to total volume stays below measurement error at these quantities. The calculator treats water volume as total volume, which matches standard reconstitution practice.
Why does my 50 IU syringe show the same units as a 100 IU syringe?
Both carry 100 marks per millilitre. The 50 IU barrel simply stops at 50. See the conversion table above.
How many doses will my vial give?
Divide the peptide mass by your dose. The calculator shows this under “Doses per vial,” rounded down to whole doses.
Can I change my dose after reconstituting?
Yes. The concentration is fixed once you add water, but you can draw any volume from that solution. Re-run the calculator with the same peptide and water figures and your new target dose.
What is bacteriostatic water?
Sterile water containing 0.9% benzyl alcohol, which suppresses bacterial growth. It differs from sterile water for injection, which contains no preservative.
Research Use Only
ENCODE Peptides Bali supplies all compounds strictly for laboratory and research use. This calculator performs arithmetic on values you enter. It does not recommend a dose, and nothing on this page constitutes medical advice or dosing guidance for humans or animals. Our products have not been evaluated by BPOM or any other regulatory body for human or veterinary use.
Read our Research Use Only Policy and Medical Disclaimer in full.