**Related Resources: calculators**

### Spring Helix Wire Length Formula and Calculator

**Manufacturing Processes and Design
Spring Design and Engineering **

**Spring Helix Wire Length Formula and Calculator **

Length of spring coil helix formula;

*l* = *π · D _{m} · i + 2 · π · D_{m}*

*or*

*l* = *π · D _{m} · ( i + 2 )*

Where:

*l* = effective length of the helix,

*i* = Number of active coils,

*D _{m}* = mean coil diameter

References:

Mechanical and Metal Trades Handbook, 2nd Edition

2010

Ulrich Fischer, Roland Gomeringer, Max Heinzler, Roland Kilgus, Friedrich Naher, Stefan Oesterle, Heinz Paetzold, Andreas Stephan

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