This torsion spring calculator estimates the wire length from the mean coil diameter, the number of coils, and the two straight legs. Enter the values above.
Formula (approximate)
Wire length ≈ π × D × N + leg lengths
Example
D = 0.5 in, N = 8, legs 4 in total: length ≈ π × 0.5 × 8 + 4 = 16.6 in.
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Frequently Asked Questions
How do I calculate torsion spring wire length?
Multiply pi by the coil diameter and the number of coils, then add the length of the two straight legs.
Do torsion spring legs use much wire?
They can. Long moment arms add noticeable length beyond the coiled body.
What diameter should I use?
Use the mean coil diameter, measured to the center of the wire, not the outside diameter.