Enter the length to fully develop the velocity profile (ft) and the tube diameter (ft) into the Calculator. The calculator will evaluate the Entrance Length.

## Entrance Length Formula

EL = Ie / d

Variables:

- EL is the Entrance Length (ft/ft)
- Ie is the length to fully develop velocity profile (ft)
- d is the tube diameter (ft)

To calculate the Entrance Length, divide the length to fully develop the velocity profile by the tube diameter.

## How to Calculate Entrance Length?

The following steps outline how to calculate the Entrance Length.

- First, determine the length to fully develop velocity profile (ft).
- Next, determine the tube diameter (ft).
- Next, gather the formula from above = EL = Ie / d.
- Finally, calculate the Entrance Length.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

length to fully develop velocity profile (ft) = 6.5

tube diameter (ft) = 0.45