# Helical Spring Index (C) Calculation

Helical Spring Index calculator is used to calculate the Spring Index (C), which is the ratio of Diameters of Spring and Wire. It is a measure of coil curvature which is usually between 3 and 12.

## Helical Spring Index Calculator

Helical Spring Index calculator is used to calculate the Spring Index (C), which is the ratio of Diameters of Spring and Wire. It is a measure of coil curvature which is usually between 3 and 12.

Code to add this calci to your website

#### Formula:

C = D/d
**Where, **
C = Spring Index
D = Spring Diameter
d = Wire Diameter
Thus the Helical Spring Index (C) calculation is made easy. Free Online Physics Calculator.