Peptide Reconstitution Calculator
Calculate Dosage, BAC Water & Syringe Units
Accurately reconstitute peptides in seconds with our free Peptide Calculator. Whether you are working with Tirzepatide, Semaglutide, BPC-157, TB-500, CJC-1295, Retatrutide or Ipamorelin, this tool helps you calculate peptide concentration, injection volume, and U-100 syringe units (IU) from your vial size and bacteriostatic water volume.
Just enter your vial amount (mg), BAC water (mL), and desired research dose (mcg) — our calculator does the rest: concentration in mg/mL, total doses per vial, and exactly how much to draw on your insulin syringe.
Fast, accurate, and built for researchers — no math errors, no guesswork.
Looking for sterile BAC water? Shop Hospira Bacteriostatic Water 30mL
What is a Retatrutide Reconstitution Calculator?
A Retatrutide peptide reconstitution calculator is an essential lab tool that converts lyophilized peptide powder into a measurable liquid concentration. Most peptides arrive as freeze-dried powder and must be reconstituted with Bacteriostatic Water (BAC Water) containing 0.9% benzyl alcohol for multi-use stability.
Our calculator uses the gold-standard formula used by research labs:
Concentration (mcg/mL) = Vial Amount (mcg) ÷ Bacteriostatic Water (mL)
Injection Volume (mL) = Desired Dose (mcg) ÷ Concentration
Syringe Units = Volume (mL) × 100
Example: A 5mg vial (5000mcg) + 2mL BAC water = 2500mcg/mL or 2.5mg/mL. For a 250mcg research dose, you need 0.1mL = 10 units on a U-100 insulin syringe.
How to Use the Peptide Calculator
Step 1: Enter Vial Size
Select your peptide vial amount. Common research sizes are 2mg, 5mg, 10mg, and 15mg. Toggle between mg and mcg (1mg = 1000mcg).
Step 2: Enter BAC Water Amount
How much bacteriostatic water will you add? Most researchers use 1mL to 3mL. Less water = higher concentration. More water = easier to measure small doses.
Step 3: Enter Target Dose
Enter your intended research dose. Use our quick chips for 100mcg, 250mcg, 300mcg, 500mcg or enter custom.
Step 4: Select Syringe Size
Choose your U-100 insulin syringe: 0.3mL (30 units), 0.5mL (50 units), or 1mL (100 units). The calculator instantly shows DRAW TO XX IU.
The tool also calculates Total Doses Per Vial and Volume Per Injection so you can plan your research protocol.
Why Bacteriostatic Water Matters for Peptides
Using high-quality Hospira-style bacteriostatic water ensures accurate concentration and prevents contamination. Unlike sterile water, BAC water with 0.9% benzyl alcohol inhibits bacterial growth for up to 28 days after reconstitution, making it the standard for multi-dose peptide research. At BacteriostaticWaterLab.com, all our BAC water is 0.22µm PES filtered and lab-tested.
Peptide Reconstitution Guide for Beginners
- Wipe vial tops with alcohol swab
- Inject BAC water slowly down the side of the peptide vial — never directly onto powder
- Allow to dissolve gently — do not shake vigorously
- Use the calculator to determine your concentration
- Store reconstituted peptides refrigerated at 2-8°C per manufacturer guidelines
Common Peptide Concentrations
Vial Size BAC Water Concentration
5mg + 1mL 1mL 5mg/mL
5mg + 2mL 2mL 2.5mg/mL
10mg + 2mL 2mL 5mg/mL
10mg + 3mL 3mL 3.33mg/mL
Syringe Units Explained:
0.3mL syringe = 30 units max
0.5mL syringe = 50 units max
1.0mL syringe = 100 units max
Frequently Asked Questions for Peptides Calculator
Divide your vial amount in mcg by BAC water volume to get concentration. Then divide your desired dose by concentration to get mL to inject. Multiply mL by 100 to get insulin syringe units.
Most labs use 1-2mL for a 5mg vial. 2mL gives 2.5mg/mL which makes 250mcg = 10 units, easy to measure accurately.
1mg = 1000mcg. Vials are labeled in mg but research doses are often in mcg.
Yes. This is a universal peptide reconstitution calculator for any lyophilized peptide including Retatrutide, Tirzepatide, Semaglutide, BPC-157, TB-500, CJC-1295 / Ipamorelin, and GHK-Cu.
Total doses = Total vial amount (mcg) ÷ Dose per injection (mcg). Example: 5000mcg vial / 250mcg dose = 20 doses.