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

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## 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:**

- First, determine the RO Water (gallons). In this example, the RO Water (gallons) is given as 300.
- Next, determine the total water (gallons). For this problem, the total water (gallons) is given as 600.
- 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 (%)