How to use this calculator
Calculate stock volume for a target concentration. Enter stock concentration (same units), target concentration (same units), final volume (ml). The result updates when you change an input. To compare two sets of inputs, save scenario A, then enter the second set; the result panel shows the difference.
Formula and limits
C₁V₁ = C₂V₂. Stock volume = target concentration × final volume ÷ stock concentration. Assumes no reaction and additive volumes. Not for medication dosing.
Worked example
The following example uses the calculator’s starting values. It is an illustration of the method, not a recommended target.
| Input | Example value |
|---|---|
| Stock concentration (same units) | 10 |
| Target concentration (same units) | 2 |
| Final volume (mL) | 100 |
Stock solution needed (mL): 20
Diluent to final volume: approximately 80 mL
Interpreting your result
Use the specified mass, volume, pressure, and temperature units. A correct arithmetic result does not establish that a laboratory procedure is safe or appropriate. These tools are not for medication dosing.
Comparing alternatives
Save the first result as scenario A, then change one input. The comparison shows the numeric difference; it does not label either result as better. Choose inputs that describe realistic alternatives. Values shown on screen are rounded, so calculations from rounded intermediate results may differ slightly.
Background reading
OpenStax Chemistry. This is a subject reference, not an endorsement or independent review of Calcaven.