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Spring Rate Calculation

If you want to have your own springs wound, here is some information for you...

  • The formula is:
 k= (Gd^4)/(8(D^3)N)
  • Where:
d = wire diameter
D = spring diameter
N = number of active coils
G = Shear modulus of material, For steel; G = 79.3 GPa

Take your tape measure and check the diameter of the coils and you've got everything you need.

The EASY way, would be to plug in the data here.

A bit more exacting formula can be figured out from the information on this page