Dilution Calculator: Solve C₁V₁ = C₂V₂ for Any Variable

You've got a stock solution at 2 M and you need to make 500 mL of 0.1 M solution. How much stock do you need? It's a straightforward C₁V₁ = C₂V₂ problem, but when you're standing at the bench and the units are in µM and µL, the mental math gets annoying fast.

Three in, one out

The dilution calculator has four fields: initial concentration, initial volume, final concentration, and final volume. Fill in any three and it solves for the fourth. Pick your units from the dropdown — molar, millimolar, micromolar for concentrations, and liters, milliliters, microliters for volumes. The tool converts everything internally so you don't have to worry about matching units yourself.

For that 2 M to 0.1 M example: enter C₁ = 2 M, C₂ = 0.1 M, V₂ = 500 mL, and the calculator tells you V₁ = 25 mL. Take 25 mL of stock, add solvent to reach 500 mL total. Simple.

Real lab scenarios

Serial dilutions are where this really pays off. If you're making a dilution series — 1:10, then 1:10 again, and again — you can run the calculator once for each step and have your volumes in seconds. No scribbling on the back of a glove box.

It's also handy for biology preps. You've got a 10 mg/mL protein stock and you need a working concentration of 0.5 mg/mL in 200 µL. Plug in the numbers, get the volume of stock to add, done.

If you're also trying to hit a target pH with your diluted solution, the pH calculator is right next door. And for figuring out the molar mass of your solute in the first place, there's the molar mass calculator. The dilution calculator handles the volume math — the rest of the tools handle everything around it.