Enter the fin heat transfer (J) and the ideal fin heat transfer (J) into the calculator to determine the Fin Efficiency.

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## Fin Efficiency Formula

The following formula is used to calculate the Fin Efficiency.

**Ef = Qf / Qif *100**

- Where Ef is the Fin Efficiency (%)
- Qf is the fin heat transfer (J)
- Qi is the ideal fin heat transfer (J)

## How to Calculate Fin Efficiency?

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

**Example Problem #1:**

- First, determine the fin heat transfer (J). In this example, the fin heat transfer (J) is given as 40.
- Next, determine the ideal fin heat transfer (J). For this problem, the ideal fin heat transfer (J) is given as 50.
- Finally, calculate the Fin Efficiency using the equation above:

Ef = Qf / Qif *100

Inserting the values from above and solving the equation:

Ef = 40 / 50 *100 = 80 (%)

**Example Problem #2: **

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

fin heat transfer (J) = 70

ideal fin heat transfer (J) = 90

Entering these values yields:

Ef = 70/ 90 *100 = 77.77 (%)