Dilution Calculator
Find the stock solution volume needed for a target concentration.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations retain full precision.
- Assumes compatible solutions and approximately additive volumes.
Example Calculation
- Stock concentration: 10 mol/L
- Target concentration: 2 mol/L
- Final volume: 500 mL
To make 500 mL of 2 M solution from 10 M stock, use 100 mL of stock and dilute to 500 mL.
Frequently asked questions
How do I use this calculator?
Enter stock concentration, target concentration, final volume. The result updates automatically. Use Reset to restore the example values.
What method does it use?
C₁V₁ = C₂V₂. Assumes compatible solutions and approximately additive volumes.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.