Helical Spring Index Calculator

Here is the online calculator to find the Spring Index (C) for a helical spring. The helical springs are made up of a wire coiled in the form of a helix. The spring index is the correlation between the mean diameter of a spring and the wire diameter of a spring. Enter the spring diameter and wire diameter in this helical spring index calculator to know the spring index (C) of a helical spring.

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Spring Index of a helical spring determines the strength of the pring, the stress induced on the spring, and the manufacturability of the spring. It is a measure of coil curvature and is usually between 3 and 12. A low Spring index indicates a tightly wound spring.