Enter the outer diameter and the wire diameter into the Coil Length Calculator. The calculator will evaluate the Coil Length.

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## Coil Length Formula

The following two example problems outline the steps and information needed to calculate the Coil Length.

CL = (OD-WD) * pi

- Where CL is the Coil Length (length per coil)
- OD is the outer diameter
- WD is the wire diameter

To calculate the coil length, subtract the wire diameter from the outer diameter, then multiply by pi.

## How to Calculate Coil Length?

The following example problems outline how to calculate Coil Length.

Example Problem #1:

- First, determine the outer diameter.
- The outer diameter is given as: 5.

- Next, determine the wire diameter.
- The wire diameter is provided as: 3.

- Finally, calculate the Coil Length using the equation above:

CL = (OD-WD) * pi

The values provided above are inserted into the equation below and computed.

CL = (5-3) * pi = 6.28 (length per coil)

Example Problem #2:** **

For this problem, the variables required are provided below:

outer diameter = 6

wire diameter = 4

Test your knowledge using the equation and check your answer with the calculator..

CL = (OD-WD) * pi** = ?**