Dilution Calculator
Volume needed to dilute a stock solution to a target concentration.
Enter your values
Enter the stock concentration in M.
Enter the target concentration in M.
Enter the final volume needed in L.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Stock volume needed
- 100 mL
- Diluent to add
- 900 mL
- Final volume
- 1000 mL
Quick answer
C1V1 = C2V2, so V1 = (C2 x V2) / C1.
C1V1 = C2V2
At a glance
| What it does | Volume needed to dilute a stock solution to a target concentration. |
|---|---|
| Category | Science |
| Inputs needed | Stock concentration, Target concentration, Final volume needed |
| Main output | Stock volume needed |
| Formula | C1V1 = C2V2 |
| Cost | Free — no sign-up, no download |
How to use the Dilution Calculator
- 1Enter the concentration of your stock (starting) solution.
- 2Enter the concentration and total volume you want to end up with.
- 3Read how much stock solution to measure out and how much diluent to add.
Inputs explained
- Stock concentration(M)
- Enter the stock concentration in M.
- Target concentration(M)
- Enter the target concentration in M.
- Final volume needed(L)
- Enter the final volume needed in L.
Worked example
Using the values the calculator loads with:
Inputs
- Stock concentration5 M
- Target concentration0.5 M
- Final volume needed1 L
Results
- Stock volume needed100 mL
- Diluent to add900 mL
- Final volume1000 mL
Frequently asked questions
What order should I mix in?
Always add stock to diluent slowly, especially for concentrated acids, to control heat and splashing safely.
Can this be used for any unit?
Yes, as long as C1 and C2 use the same concentration units the volumes will come out consistently.
What do I need to enter into the Dilution Calculator?
Just 3 values: stock concentration, target concentration, final volume needed. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Dilution Calculator work out the answer?
C1V1 = C2V2, so V1 = (C2 x V2) / C1. It applies the formula C1V1 = C2V2 and shows the working so you can check each step by hand.
Is the Dilution Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.