Enter the RO Water (gallons) and the total water (gallons) into the calculator to determine the RO Efficiency. 

RO Efficiency Formula

The following formula is used to calculate the RO Efficiency. 

Ero = RW / TW *100

  • Where Ero is the RO Efficiency (%)
  • RW is the RO Water (gallons) 
  • TW is the total water (gallons) 

How to Calculate RO Efficiency?

The following two example problems outline how to calculate the RO Efficiency.

Example Problem #1:

  1. First, determine the RO Water (gallons). In this example, the RO Water (gallons) is given as 300.
  2. Next, determine the total water (gallons). For this problem, the total water (gallons) is given as 600.
  3. Finally, calculate the RO Efficiency using the equation above: 

Ero = RW / TW *100

Inserting the values from above and solving the equation: 

Ero = 300 /600 *100 = 50 (%)

Example Problem #2: 

Using the same process as above, first define the variables required by the formula. In this case, these values are:

RO Water (gallons) = 500

total water (gallons) = 750

Entering these values yields:

Ero = 500 / 750 *100 = 66.667 (%)