This online calculator allows you to find one of four parameters: volume before dilution, molar concentration before dilution, volume after dilution, molar concentration after dilution - based on the other three. It is intended for solving problems on dilution of solutions.

Graph of hydrogen peroxide solution density vs. mass fraction. Source: Ya. A. Gurvich // Handbook for the Young Chemical Process Operator // p. 144, Table 7.6

This online calculator converts the peroxide content in an aqueous solution by mass (mass fraction) into volumetric concentration (not to be confused with volume fraction).

This online calculator converts the peroxide content in an aqueous solution by mass (mass fraction) into volume concentration (not to be confused with volume fraction).