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Dilution calculator
C1V1 = C2V2: how much stock and diluent to mix for the concentration you need.
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About Dilution calculator
Based on C1 x V1 = C2 x V2, this tool finds the volume of stock solution needed to prepare a weaker solution. It then gives the amount of diluent to add, since the stock volume is part of the final volume. Common in labs, cleaning products and hydroponics.
How to use Dilution calculator
- Enter the concentration of your stock solution.
- Enter the concentration and the final volume you want.
- Read how much stock to take and how much diluent to add.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
Do I add the diluent volume to the stock volume?
The final volume V2 includes the stock. If you need 100 mL and the stock needed is 20 mL, add 80 mL of diluent, not 100 mL.
Can I use any concentration unit with C1V1 = C2V2?
Yes, as long as C1 and C2 use the same unit, and V1 and V2 use the same unit. Only the ratio matters, so molar, percent or mg/mL all work if you stay consistent.
How do I plan a serial dilution?
Work one step at a time, using the diluted result of the first step as the stock for the next. Keep each step to a modest ratio, since small pipetting errors grow when you dilute a lot at once.
Is Dilution calculator free?
Yes. Dilution calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Dilution calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.