Peptide calculator

Enter three numbers to find how much liquid contains the peptide amount you need for a research sample.

Example numbers are filled in so you can see how it works. Replace them with your own research values.

Enter the total mg shown on the vial label. This is the peptide amount, not the liquid volume.

mg

Enter the measured total volume after mixing, in mL. This may differ from the amount of liquid you added.

mL

Use the amount required by your research method. Choose mg or mcg to match that amount.

Your result

Liquid needed for one sample

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Peptide in each 1 mL—
Same volume in microliters—

mg and mcg measure peptide amount. mL and µL measure liquid volume.

Show the calculation

For laboratory research calculations only. This tool calculates volume; it does not choose a sample amount or recommend a dose.

A quick guide to the numbers

Start with the vial label, the measured liquid volume after mixing, and the sample amount required by your research method.

What do the units mean?

mg · milligrams
The amount of peptide. A vial labeled 10 mg contains 10 milligrams of material.
mcg (µg) · micrograms
A smaller unit for peptide amount. 1 mg = 1,000 mcg, so 0.25 mg = 250 mcg.
mL · milliliters
The volume of liquid. This is the main unit used for the calculator’s result.
µL · microliters
A smaller unit for liquid volume. 1 mL = 1,000 µL, so 0.1 mL = 100 µL.

One worked example

A vial containing 5 mg of peptide is mixed to a final volume of 2 mL. Each 1 mL contains 2.5 mg. A sample containing 0.25 mg therefore has a volume of 0.1 mL (100 µL). These numbers illustrate the math only.

What does “reconstitution” mean?

It means dissolving a freeze-dried material in a suitable liquid. The material’s documentation and your laboratory method determine which liquid to use and how to prepare it. The calculator does not select a mixing method.

Before you start

  1. Check the peptide amount and batch number on the label or supporting documentation.
  2. Use the liquid and preparation method specified for that material.
  3. Use calibrated equipment that can accurately measure the volume you need.
  4. Check that the material has dissolved, then measure the final liquid volume.

Keep a clear record

Record the material name, batch, peptide amount, liquid used, final volume, preparation date, and required storage conditions. Also record how much peptide is present per mL; this is called concentration.

What the calculation assumes

The math uses the peptide amount and final liquid volume you enter. It assumes the material has fully dissolved and does not adjust for purity, measured content, or material lost during preparation. Record any corrections required by your laboratory method separately.

Peptide per mL = total peptide (mg) ÷ final liquid volume (mL).
Liquid needed (mL) = sample peptide amount (mg) ÷ peptide per mL (mg/mL).