Cleaning Calculators

Free calculators for cleaning and home-care jobs. Each one explains its numbers and links to the official guidance behind them.

• Bleach dilution calculator

  How much bleach to mix with water to disinfect, to sanitize cutting boards and food-contact surfaces, or to clean up after a stomach bug or mice (CDC and USDA ratios).

• Mold cleanup calculator

  Add up the moldy area and see whether EPA guidance says it is a do-it-yourself job or one for a professional, plus what to wear and what to throw away.