Dilution Calculator
Make up to the entered final total volume.
Stock volume = target concentration × final volume ÷ initial concentration
Calculate stock volume needed for a dilution using C₁V₁ = C₂V₂.
Formula
Stock volume = target concentration × final volume ÷ initial concentration
Worked example
Initial concentration: 1 mol/L
Target concentration: 0.1 mol/L
Final solution volume: 100 mL
With these inputs, the result is 10 mL. Make up to the entered final total volume.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
Assumes the same solute and compatible concentration units. This is not a chemical handling instruction.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
Assumes the same solute and compatible concentration units. This is not a chemical handling instruction.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
Sources & references
- NIST Guide to the SI — National Institute of Standards and Technology
