A free, visual reconstitution calculator for laboratory research work. Choose your syringe size, the amount in the vial, the bacteriostatic water you're adding, and your target research quantity — it shows the concentration, the exact units and volume to draw, the total number of doses in the vial, and marks the draw point on a to-scale syringe. For laboratory research use only.
RESEARCH USE ONLY. This tool performs reconstitution math for laboratory reference materials. It is not medical, dosing, or usage guidance, and nothing here concerns human or animal use.
⚠ The required draw exceeds your selected syringe size — choose a larger syringe or split the draw.
Total doses in this vial: —
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How the math works
Three steps, two of them just division:
Concentration = peptide (mg) ÷ bacteriostatic water (mL). Example: 10 mg in 2 mL = 5 mg/mL (5,000 mcg/mL).
Syringe units = draw volume (mL) × 100 on a U-100 syringe → 0.05 mL = 5 units. That's the mark the tool highlights on the syringe above.
More diluent means a lower concentration and a larger draw volume (easier to measure precisely on the syringe); less diluent concentrates it into a smaller draw. If the calculated draw is larger than your syringe holds, the tool flags it — pick a bigger syringe or split the draw. Always work from the exact figures on the material's Certificate of Analysis — see how to read a COA and how to store peptides.
Sponsor disclosure: reference materials for the compounds discussed on this site are supplied strictly for laboratory research use only by NovaForge Labs — third-party HPLC-tested with a published Certificate of Analysis for every lot. NovaForge Labs is a sponsor of The Peptide Review. This calculator is an editorial convenience tool and does not constitute dosing or usage guidance.
Frequently asked questions
How do I reconstitute a peptide?
In research settings, reconstitution means dissolving a lyophilized (freeze-dried) peptide in bacteriostatic water. The concentration you end up with equals the milligrams of peptide divided by the millilitres of water you add. This calculator computes how much water to add for a target concentration and the volume to draw — strictly as a research reference, not usage guidance.
How much bacteriostatic water should I add to a peptide vial?
There is no single correct amount — the volume you add sets the concentration. More water means a lower concentration and larger, easier-to-measure draw volumes; less water means a higher concentration. The calculator lets you enter a volume and instantly see the resulting concentration and draw amount.
How do I convert an amount to insulin-syringe units?
On a standard U-100 insulin syringe, 100 units equals 1 mL. Once you know your concentration (mg per mL), the calculator converts a target amount in micrograms into the corresponding number of units on the syringe.
What is the difference between bacteriostatic and sterile water?
Bacteriostatic water contains a small amount of benzyl alcohol, a preservative that lets a multi-use vial stay usable for weeks. Sterile water has no preservative. For anything drawn from repeatedly in research, bacteriostatic water is the norm.