Enter the wire diameter, coil length, and number of turns into the calculator to determine the coil diameter. This calculator helps in designing and understanding the dimensions of coiled wire.

Coil Diameter Formula

The following formula is used to calculate the coil diameter.

CD = (CL / N) - WD

Variables:

  • CD is the coil diameter (mm)
  • CL is the coil length (mm)
  • N is the number of turns
  • WD is the wire diameter (mm)

To calculate the coil diameter, divide the coil length by the number of turns and then subtract the wire diameter.

What is Coil Diameter?

Coil diameter is a measure of the diameter of a coil formed by winding a wire or other flexible material around a cylinder. It is an important parameter in the design of springs, coils, and other similar mechanical components. The coil diameter can affect the performance characteristics of the coil, such as its stiffness and the amount of space it occupies.

How to Calculate Coil Diameter?

The following steps outline how to calculate the Coil Diameter.


  1. First, determine the wire diameter (WD) in millimeters.
  2. Next, determine the coil length (CL) in millimeters.
  3. Next, determine the number of turns (N).
  4. Next, gather the formula from above = CD = (CL / N) – WD.
  5. Finally, calculate the Coil Diameter (CD) in millimeters.
  6. 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.

wire diameter (WD) = 1 mm

coil length (CL) = 100 mm

number of turns (N) = 10