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Solution calculator.

Work out the concentration of a stock solution, then how much of it you need for a dilution. For preparing laboratory stocks only. This is not a dosing tool.

Stock solution

What's in the vial and how much solvent you add.

Dilution

The working solution you want to make from the stock.

Stock concentration
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Same, in µg/mL
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Molarity
Add molecular weight
Stock to use
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Solvent to add
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Uses C = m / V and C₁V₁ = C₂V₂. The mass is the powder you weigh, which isn't all peptide. Check every number against your own protocol.

Before you calculate

Two things worth knowing.

Guide

Purity vs. peptide content

The powder you weigh includes counter-ions and water. Here's how to correct for it.

Read the guide Handling

Good habits at the bench

Storage, solvents and aliquots, so the stock you calculate is the stock you get.

See the steps