Skip to content
Ask Dr. Laundry

Ask Dr. Laundry

Dilution Ratio

By Dr. Laundry October 3, 2011

Q:  How do I mix a 1:30 ratio?

A:  Basically a 1:30 ratio means 1 part bleach to 30 parts water.  How you measure a “part” depends on how much bleach solution you want to end up with.  Let’s say you want approximately 1 gallon of bleach solution.  1 gallon = 16 cups = 32 half-cups, which is close to 30.  So to end up with close to a gallon of bleach solution, you would add ½ cup of bleach to 30 half cups of water (which is the same as 15 cups, or 1 gallon minus 1 cup).  On the other hand, if you only want a small amount, then you could add 1 Tablespoon bleach to 30 tablespoons water (which is the same as 2 cups minus 2 Tablespoons since there are 16 tablespoons in a cup).  This will give you almost 2 cups of a 1:30 bleach solution.  Hopefully this helps!

Readers, what size bleach solution do you normally make at one time?