Dilution Calculator
How much stock solution makes this target concentration and volume? Enter the stated values to calculate this model.
Reference calculation or estimate for example inputs; assumptions and limitations apply.
Calculations run in your browser.
Assumptions / Standards / Limitations
Conservation of the same solute on the same concentration basis is assumed. Target concentration must not exceed stock concentration. Final solution volume is the target volume; volume minus stock is only an additive-volume approximation and is not a mixing instruction.
Model reference: OpenStax Chemistry 2e; supplementary IUPAC definition where listed. Last verified: 2026-10-08. This is a scientific reference model; no regulatory code or installation standard is used.
Example inputs illustrate the calculation. They are not recommended preparation, installation or operating settings.
What to enter
| Input | Meaning and units |
|---|---|
| Stock concentration (mol/L) | Enter stock concentration in mol/L; use the same basis as the other measurements. |
| Target concentration (mol/L) | Enter target concentration in mol/L; use the same basis as the other measurements. |
| Final volume (mL) | Enter final volume in mL; use the same basis as the other measurements. |
Understanding your result
The result is a scientific reference calculation under the model assumptions on this page. It does not assess hazards, chemical compatibility, purity, solubility, equipment limits or clinical meaning.
Common mistakes
- Using solvent volume in place of final solution volume, or mass concentration in place of molar concentration.
- Ignoring units, reaction coefficients, activity assumptions or the stated temperature/model limits.
Check your calculation
- Check the units and balance/coefficients against the worked example. For real laboratory work, verify SDS information and the applicable procedure independently.
Calculation checks, sources and review limits
How much stock solution makes this target concentration and volume?
How much stock solution makes this target concentration and volume? Enter the stated values to calculate this model.
Common uses
- How much stock solution makes this target concentration and volume
How it works
Use conservation of solute in C1 × V1 = C2 × V2 to calculate the stock-volume reference. Subtracting stock volume from target volume gives only an approximate diluent-volume difference when volumes are additive; this is not a preparation procedure.
Worked example
Enter Stock concentration: 2 mol/L; Target concentration: 0.5 mol/L; Final volume: 100 mL. Results: Stock volume: 25 mL; Approximate diluent volume: 75 mL.