What is the Dilution Calculator (C1V1 = C2V2)?
Find the volume of stock solution needed to make a dilution. These physics and science calculators apply standard SI formulas with exact constants (such as g = 9.80665 m/s² and the 2019 SI definitions) for students, engineers and curious minds.
How to use the Dilution Calculator (C1V1 = C2V2)
- Enter your stock concentration, your target concentration, your target volume.
- Results update automatically as you type; you can also press Calculate.
- Read the output: stock volume needed (v1), diluent to add.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With stock concentration = 10, target concentration = 2, target volume = 500 mL, the Dilution Calculator (C1V1 = C2V2) returns stock volume needed (v1): 100.000 mL; diluent to add: 400.000 mL.
Tips for better results
- Convert inputs into SI units first for the cleanest results.
- Idealized formulas ignore friction and air resistance unless stated.
- Use our unit converters to switch between metric and imperial results.
Frequently asked questions
What does the Dilution Calculator (C1V1 = C2V2) do?
Find the volume of stock solution needed to make a dilution.
How is it calculated?
The Dilution Calculator (C1V1 = C2V2) uses this method: V₁ = C₂V₂ ÷ C₁.
Can you show an example?
With stock concentration = 10, target concentration = 2, target volume = 500 mL, the Dilution Calculator (C1V1 = C2V2) returns stock volume needed (v1): 100.000 mL; diluent to add: 400.000 mL.
Is the Dilution Calculator (C1V1 = C2V2) accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Dilution Calculator (C1V1 = C2V2) is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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