Peptide Calculator

What a Peptide Calculator Actually Does

A peptide calculator (also called a reconstitution calculator or a peptide dosage calculator) takes the two numbers you already have, the peptide in your vial and the water you added to it, and turns them into the one number you need: how far to pull the plunger.

It answers two questions that are easy to get wrong on paper:

1. Reconstitution: after adding a given volume of diluent to the vial, how concentrated is the solution?
2. Dosage: at that concentration, how much volume, and how many syringe units, is one dose?

Doing both by hand means two conversions and a division, usually while holding a vial. Peptides are active in micrograms, so a decimal in the wrong place is not a rounding error, it is a different dose entirely. The MAX Peptide AI peptide calculator does both steps at once and shows the result on a syringe.

Using the Peptide Calculator, Step by Step

Pick your peptide, enter what is in the vial, enter the diluent you added, enter the dose you want, and choose your syringe. Every conversion between mg, mcg, mL and units happens as you type.

What comes back:

1. The concentration of your reconstituted vial (mcg/mL)
2. The draw volume for your dose (in mL and in syringe units)
3. How many doses that vial holds

If the dose does not fit the syringe you picked, the calculator says so instead of quietly returning a number you cannot draw. If the dose lands somewhere hard to read on the barrel, it suggests a water volume that puts it on a clean mark.

Step-by-Step Example

You have a 10mg vial. You add 2mL of bacteriostatic water. You want 500mcg per injection. Here is the math the peptide dosage calculator runs:

1. Concentration: 10mg is 10,000mcg. Divided by 2mL, that is 5000mcg/mL.
2. Volume for 500mcg: 500 / 5000 = 0.1mL.
3. Syringe units: 0.1mL x 100 = 10 units on a U-100 syringe.

500mcg is 10 units, and the vial holds 20 doses.

Quick Reference Charts

The charts below cover the mixes people reach for most often. All of them assume a U-100 insulin syringe, where 100 units is 1mL.

Dose-to-Units Reference

Example: 5mg vial + 2mL = 2500mcg/mL, so 250mcg = 0.10mL (10 units). Adjust values to your dose, as needed.

Types of Syringes

Types of Diluents

Storing and Mixing Your Peptides

Lyophilised peptide arrives as a powder. Keep the vial at 2-8 °C if you will use it soon, or at -20 °C if it is going to sit. Once it is in solution:

1. Mixed with bacteriostatic water: label it with the date, refrigerate it, and expect roughly 28 days of stability. If you froze aliquots, thaw only what you need and do not refreeze.
2. Mixed with sterile water: one draw, within 24 hours, then discard the vial. There is no preservative keeping it clean after the first entry.

Let both the powder and the diluent come to room temperature before you mix them. Cold glass and cold liquid make the powder dissolve slowly, which tempts people into shaking the vial.

Nothing that is not a sterile pharmaceutical diluent belongs in a peptide vial. Tap water, flavoured saline and additive-carrying solutions all degrade the peptide and introduce contaminants.

Five Mistakes That Ruin a Reconstitution

Every one of these produces a number that looks reasonable and is not. They come up far more often than math errors do.

1. Drawing U-100 math on a U-40 syringe. A U-40 barrel holds 40 units per mL, so the same mark is 2.5 times the volume. Veterinary syringes are U-40, and they look almost identical.
2. Shaking the vial. Peptides are fragile chains. Direct the water down the glass wall, then swirl or leave it to dissolve. Foam on the surface means you have already broken some of it.
3. Adding too much water for a small dose. Dilute far enough and your dose lands at 2 or 3 units, where the gradations are wider than the volume you are trying to measure. Use less water, or a 0.3mL syringe.
4. Mixing units. The vial is labelled in mg, protocols are written in mcg, and 1mg is 1000mcg. A dose entered in the wrong unit is off by three orders of magnitude.
5. Trusting a vial past its window. Bacteriostatic water buys about 28 days refrigerated. Sterile water buys one dose. Repeated freeze and thaw cycles cost potency every time, so aliquot before freezing.