Peptide Reconstitution Calculator: Complete Dosing Math Guide

All peptide reconstitution math comes down to three key formulas:

Formula 1: Concentration

Concentration (mcg/mL) = Total Peptide (mcg) ÷ Volume of Solvent (mL)

This tells you how much peptide is in each milliliter of your reconstituted solution.

Formula 2: Micrograms Per Unit

mcg per unit = Concentration (mcg/mL) ÷ 100

Since a standard 1mL insulin syringe has 100 units, dividing the concentration by 100 tells you how many micrograms are in each unit marking.

Formula 3: Units Per Dose

Units to inject = Desired Dose (mcg) ÷ mcg per unit

This converts your target dose into the number of units to draw on the syringe.

That is it — three formulas cover every peptide reconstitution scenario. The rest is just plugging in numbers.

Let's walk through a complete example with BPC-157:

Given: 5mg BPC-157 vial, 2mL bacteriostatic water, desired dose of 250mcg

Step 1: Convert mg to mcg

5mg × 1,000 = 5,000mcg

Step 2: Calculate concentration

5,000mcg ÷ 2mL = 2,500mcg/mL

Step 3: Calculate mcg per unit

2,500 ÷ 100 = 25mcg per unit

Step 4: Calculate units per dose

250mcg ÷ 25mcg = 10 units

So you would draw to the 10-unit mark on your insulin syringe for a 250mcg dose.

Use these pre-calculated tables for the most common peptide and vial configurations:

BPC-157 Reconstitution Chart

Semaglutide Reconstitution Chart

Tirzepatide Reconstitution Chart

These are the most frequent calculation errors that lead to incorrect dosing:

• Forgetting the mg to mcg conversion. 1mg = 1,000mcg. A 5mg vial contains 5,000mcg, not 5mcg. This error leads to doses that are off by a factor of 1,000.
• Confusing mL with units. On a standard insulin syringe, 1mL = 100 units. If your calculation gives you 0.1mL, that is 10 units on the syringe.
• Using total vial amount instead of concentration. You dose based on concentration (mcg per mL), not the total peptide in the vial. Adding more water lowers the concentration — the total amount stays the same.
• Not accounting for dead space. Syringes have a small dead space in the hub. For precise dosing with expensive peptides, consider low dead-space syringes or slightly overfill when drawing.
• Rounding errors. If your calculation gives 8.3 units, use the closest whole or half marking. Avoid stacking rounded values across multiple calculations.

Accurate dosing math is foundational to safe and reliable peptide research:

• Always double-check your calculations before drawing a dose.
• When in doubt, use more BAC water — a more dilute solution is easier to measure accurately, and you can always draw more volume.
• Keep a calculation record alongside your injection log for full research documentation.
• Verify your peptide quantity against the vendor's COA, not just the vial label.

Disclaimer: All peptides discussed in this article are intended for research purposes only and are not for human consumption. This calculator and guide are provided for educational purposes. Ascension Peptides provides research-grade peptides with accurate labeling and third-party COA verification to ensure your dosing math starts with reliable numbers.