Peptide Reconstitution Calculator

For educational purposes only. Not medical advice. Full disclaimer
MS

Figure out how strong your peptide solution is after mixing — no math needed.

New to Peptides? Read This First

What is reconstitution? Peptides come as a freeze-dried powder. "Reconstitution" simply means adding water to turn the powder into an injectable liquid.

What is BAC water? Bacteriostatic water (BAC water) is sterile water with 0.9% benzyl alcohol — a harmless preservative that keeps the solution safe to use for weeks after mixing.

What's an insulin syringe? A small syringe marked with 100 "units." Each unit is a tiny measurement (100 units = 1 ml). You can buy them at most pharmacies without a prescription.

mg vs mcg? 1 milligram (mg) = 1,000 micrograms (mcg). Vials are labeled in mg, doses are usually in mcg. This calculator converts for you.

Quick Start Guide

1

Check Your Vial

Find the mg amount on your peptide vial label (e.g., 5mg, 10mg)

2

Enter Values Below

Type your peptide amount and how much water you'll add

3

Get Your Results

Results update instantly - no button needed!

Look at your vial label - enter the mg number you see

Bacteriostatic water — how many ml will you add? (Common: 1-2ml)

3

Your Results

Concentration

—

mcg per ml

This is how much peptide is in each milliliter

Per Insulin Unit

—

mcg per unit (100u syringe)

Each tick mark on your syringe = this much peptide

Draw -- units on a U-100 insulin syringe:

0255075100

Standard 100-unit (1ml) insulin syringe

How Peptide Reconstitution Works

Peptide Peptide Powder Enter mg above + Add BAC Water BAC Water Enter ml above = Mix Ready — mcg/ml Solution — mcg/ml Draw — mcg/unit Draw Your Dose Enter values above Use a U-100 syringe

How to Use This Calculator

  1. Enter the peptide amount – This is the total milligrams (mg) in your peptide vial. Common sizes include 5mg, 10mg, and 15mg.
  2. Enter the BAC water amount – This is how much bacteriostatic water you'll add. More water = lower concentration (easier to measure small doses). Less water = higher concentration.
  3. Read your results – The calculator shows your concentration in mcg/ml and how many micrograms are in each unit on a 100-unit insulin syringe.

Understanding the Math

The reconstitution formula is straightforward:

Concentration (mcg/ml) = (Peptide mg × 1000) ÷ Water ml

For insulin syringe units (100 units = 1 ml):

mcg per unit = Concentration ÷ 100

Common Reconstitution Examples

Peptide Water Concentration mcg/unit
5mg2ml2,500 mcg/ml25 mcg
5mg2.5ml2,000 mcg/ml20 mcg
10mg2ml5,000 mcg/ml50 mcg
10mg5ml2,000 mcg/ml20 mcg

Frequently Asked Questions

There's no single "correct" amount. Using more water creates a lower concentration, making it easier to measure smaller doses accurately. A common approach is 1-2ml per 5mg of peptide. For very small doses, consider using more water.
1 milligram (mg) = 1,000 micrograms (mcg). Peptide vials are typically measured in mg, while doses are often measured in mcg. This calculator converts between the two automatically.
Most people use U-100 insulin syringes, which have 100 units per 1ml. This calculator assumes you're using a 100-unit syringe. The "mcg per unit" result tells you how much peptide is in each unit marking on your syringe.
When stored properly in a refrigerator (2-8°C), most reconstituted peptides remain stable for 4-6 weeks. The bacteriostatic water contains benzyl alcohol which helps prevent bacterial growth. Never freeze reconstituted peptides.

Done Calculating? Track Your Daily Doses

Set up your protocol once, then come back daily to log injections, monitor vial usage, and stay on schedule.

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