Dilution Calculator (C1V1 = C2V2)
Fill in the values and the answer updates as you type.
How the Dilution Calculator (C1V1 = C2V2) works
C1 × V1 = C2 × V2. Solve for V1 = C2 × V2 ÷ C1, then top up with solvent to the final volume. Keep concentration units the same on both sides. The target must be lower than the stock. Example: with the default values, stock volume needed comes to 12.5.
Inputs and results
The Dilution Calculator (C1V1 = C2V2) takes 3 inputs and gives 3 results.
What you enter
- Stock concentration — starts at 10.
- Target concentration — starts at 0.5.
- Final volume (mL) — starts at 250.
What you get
- Stock volume needed
- Solvent to add
- Dilution factor
Example: Dilution Calculator (C1V1 = C2V2) with the starting values
With stock concentration 10, target concentration 0.5 and final volume 250 mL, the calculator returns:
| Stock volume needed | 12.5 |
|---|---|
| Solvent to add | 237.5 |
| Dilution factor | 20 |
Change any value above and the results update straight away.
Dilution Calculator (C1V1 = C2V2) FAQ
How do I use the Dilution Calculator (C1V1 = C2V2)?
Enter stock concentration, target concentration and final volume in the fields, then read stock volume needed, solvent to add and dilution factor in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Dilution Calculator (C1V1 = C2V2) calculate?
Find how much stock solution you need for a target concentration. It returns stock volume needed, solvent to add and dilution factor from the 3 values you provide.
What values does the Dilution Calculator (C1V1 = C2V2) start with?
It opens with stock concentration 10, target concentration 0.5 and final volume 250 mL so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Dilution Calculator (C1V1 = C2V2) free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Dilution Calculator (C1V1 = C2V2) for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.