Dilution Factor Calculator

Dilution Factor Calculator

The Dilution Factor Calculator computes stock-to-dilutant (S:D) and stock-to-total (S:T) ratios from solution volumes. Dilution factor notation tells you how much stock solution is present relative to dilutant added or to the final total volume.

Given stock volume $V_{stock}$, dilutant volume $V_{dilutant}$, and total volume $V_{total}$:

$$V_{total} = V_{stock} + V_{dilutant}$$

$$S:D = V_{stock} : V_{dilutant}$$

$$S:T = V_{stock} : V_{total}$$

The concentration dilution factor is $DF = V_{total} / V_{stock}$. For example, mixing 10 mL stock with 90 mL dilutant gives S:D = 1:9 and S:T = 1:10.

For related calculations, see our Dilution Calculator and Serial Dilution Calculator.