Chlorine Dilution Calculator

This easy-to-use calculator tells you how much liquid bleach to add to water to get your desired concentration (ppm) of chlorine solution. This tool was developed to assist Environmental Health Officers, food establishment operators, care facility operators, swimming pool operators, and the public to prepare the appropriate concentration of chlorine solution using bleach (sodium hypochlorite).

It is recommended that you verify the strength of your chlorine solution with chlorine test strips or titration kits.

Important mixing instructions

Never mix acid products with bleach or bleach-containing products. Mixing bleach and acid generates a very toxic chlorine gas. Always add the bleach solution to the water when preparing the solution, not vice versa. Follow manufacturer’s safety instructions on the product label and refer to Material Safety Data Sheet for further details on handling. Follow safety precautions by using personal protective equipment, including protective clothing, gloves and safety goggles.