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Calculate solution molarity from amount of substance and solution volume.
Calculators / Biology / Solution dilution
Solution dilution calculator
Calculate final concentration or required stock volume using C1V1 = C2V2.
On this page
Final concentration10same concentration unit
Diluent to add225mL
Calculator controls
How to calculate
Calculate final concentration or required stock volume using C1V1 = C2V2.
C₂ = C₁ × V₁ ÷ V₂; diluent = final volume − stock volume
Worked example
Stock concentration: 100; Stock volume (mL): 25; Final total volume (mL): 250.
Final concentration: 10 same concentration unit; Diluent to add: 225 mL.
Assumptions and limits
Assumes additive volumes and no reaction. Use compatible concentration units and follow laboratory safety procedures.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Calculate final concentration or required stock volume using C1V1 = C2V2. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the solution dilution for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Stock concentration | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Stock volume (mL) | Enter a number of at least 0 and no more than 1000000000000. |
| Final total volume (mL) | Enter a number of at least 0.000001 and no more than 1000000000000. |
Frequently asked questions
What are the limits of this solution dilution?
Assumes additive volumes and no reaction. Use compatible concentration units and follow laboratory safety procedures.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.