Enter the power produced by the propeller and the applied power into the calculator to determine the Propeller Efficiency.

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## Propeller Efficiency Formula

The following formula is used to calculate the Propeller Efficiency.

**Eprop = PP / AP * 100**

- Where Eprop is the Propeller Efficiency (%)
- PP is the power produced by the propeller
- AP is the applied power

## How to Calculate Propeller Efficiency?

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

**Example Problem #1:**

- First, determine the power produced by propeller. In this example, the power produced by propeller is given as 45.
- Next, determine the applied power. For this problem, the applied power is given as 80.
- Finally, calculate the Propeller Efficiency using the equation above:

Eprop = PP / AP * 100

Inserting the values from above and solving the equation:

Eprop = 45 / 80 * 100 = 56.25 (%)

**Example Problem #2: **

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

power produced by propeller = 83

applied power = 105

Entering these values yields:

Eprop = 83/105 * 100 = 79.04 (%)