What this tool solves
Reconstitution math starts with two values: total compound in the vial and BAC water added. From there, the calculator finds concentration and the liquid volume for the selected dose.
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BAC water and syringe math
Free Peptide Reconstitution Calculator
Calculate peptide concentration, dose volume, and U-100 syringe marks after adding BAC water to a vial. Editable calculator math only.
Free peptide reconstitution calculator for BAC water, dose volume, and U-100 syringe mark math.
U-100 marksBAC water mathmL to draw
Math support only
This page is for calculator math and education. It does not diagnose, prescribe, or replace product-label or prescriber instructions.Example calculation
Peptide reconstitution calculator example
This reconstitution example shows how total mg in the vial and BAC water determine the concentration before any syringe mark is calculated.
- Vial amount
- 10 mg total
- BAC water added
- 2 mL
- Example dose
- 500 mcg
- Concentration
- 5,000 mcg/mL
- Liquid to draw
- 0.1 mL
- U-100 syringe
- 10th mark
In this example, the visual syringe guide would point to the 10th mark. Change the vial, water, or dose values in the calculator to match the exact instructions you are using.
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What you need before calculating
You need the vial amount, water amount, syringe size, and the target dose from a reliable instruction source.
Why simple matters
A clean reconstitution calculator reduces mental math and helps users see the syringe mark visually before they save or print anything.
Frequently asked questions
Does adding more BAC water change the total peptide in the vial?
No. It changes concentration. More water usually means each syringe mark contains less compound.
Is this a prescription or protocol?
No. PeptiCalc is a measurement calculator. It helps translate vial strength, BAC water, and a selected dose into syringe marks, but it does not prescribe treatment.
Can I edit the preloaded values?
Yes. Every value that opens in the calculator is editable, including vial amount, BAC water, syringe size, and dose.
Why do syringe marks matter?
Most U-100 insulin syringes show 100 marks per mL. The calculator converts the liquid dose into the mark to pull to on that syringe scale.