For research purposes only. This page explains reconstitution/concentration math. It does not recommend any human dose.
Run the Numbers
Enter any vial size and water volume — the calculator returns the concentration and exact syringe volume for 100+ research compounds. Free, no login required.
Open the free reconstitution calculator →Peptide Reconstitution Calculator
Works for any research compound. Enter the vial mass, bacteriostatic water volume, and the target amount you want to measure — results update instantly. For research purposes only; this is reconstitution measurement math, not a dose recommendation.
What "reconstitution" means
Reconstitution is dissolving a lyophilized (freeze-dried) research peptide in bacteriostatic water so its concentration can be measured precisely. The calculation is identical across compounds — only the vial mass and water volume change.
The universal formula
Concentration (mg/mL) = vial mass (mg) ÷ water volume (mL).
Measured volume (mL) = target amount ÷ concentration. (×100 for insulin-syringe units.)
Worked examples (illustrative math only)
- Research semaglutide, 10 mg vial in 2 mL water → 5 mg/mL.
- Research tirzepatide, 60 mg vial in 3 mL water → 20 mg/mL.
The calculator returns the concentration and the exact syringe volume for any vial size and water volume.
Important compliance note
Research-grade semaglutide and tirzepatide referenced here are research compounds, distinct from the FDA-approved drugs (semaglutide is the active in Ozempic®/Wegovy®; tirzepatide in Mounjaro®/Zepbound®). The research compound forms are not FDA-approved. This page covers measurement math only.
Open the Calculator
Let the free Peptide Manager Pro calculator return your concentration and syringe volume for any research compound.
Open the Calculator →Reminder: For research purposes only.
Frequently asked questions
How do you calculate peptide reconstitution?
Divide the vial mass (mg) by the bacteriostatic water volume (mL) to get the concentration in mg/mL. To find the volume to draw for a target amount, divide the target amount by the concentration. The calculator above does it instantly. For research purposes only.
What is concentration in mg/mL?
Concentration is how much peptide is dissolved per milliliter of water — mass ÷ water volume. For example, 5 mg in 2 mL is 2.5 mg/mL. More water lowers the concentration.
How do I convert a draw volume to insulin units?
On a U-100 insulin syringe, 1 unit equals 0.01 mL, so units = draw volume in mL × 100. A 0.1 mL draw is 10 units.
Does this work for semaglutide and tirzepatide?
Yes. The same reconstitution math applies to any research compound. Dedicated semaglutide and tirzepatide reconstitution calculators are also available. For research purposes only.
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