What this calculator does
Dilution calculations help work out how much stock solution is needed to make a weaker solution at a target volume.
Formula used
The calculator uses C1V1 equals C2V2. Stock volume equals target concentration multiplied by target volume, divided by stock concentration.
How to read the result
After measuring the stock volume, add solvent until the final solution reaches the target volume.
Assumptions
- Stock and target concentrations must use the same unit.
- Target volume is entered in millilitres.
- Assumes ideal mixing.
Sources and checks
This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.
Frequently asked questions
Is solvent volume the same as target volume minus stock volume?
In simple classroom calculations, yes. In lab work, the usual method is to add solvent up to the final marked volume.