This compression spring calculator estimates the wire length needed to wind a spring from the mean coil diameter and the total number of coils. Enter both values above.
Formula (approximate)
Wire length ≈ π × D × Ntotal
- D — mean coil diameter, Ntotal — total coils
Example
D = 1 in, N = 10: length ≈ π × 1 × 10 = 31.4 in.
Related calculators
Frequently Asked Questions
How do I calculate compression spring wire length?
Multiply pi by the mean coil diameter and the total number of coils. It gives a close estimate for the wire needed.
Does pitch change the wire length?
Slightly. The estimate assumes tight coils; steep pitch adds a small amount through the coil angle.
What is the total number of coils?
It is the active coils plus the closed end coils, typically the active count plus about two.