Spring Rate Calculator

Your details

Sets the shear modulus G automatically. Override with the custom option below.
Diameter of the spring wire cross-section.
mm
Outside diameter of the coil. Mean diameter D = OD - d.
mm
Total number of coils in the spring, including inactive end coils.
End style determines how many coils are inactive (do not contribute to deflection).
Applies suspension geometry (motion ratio) to convert spring rate to effective wheel rate.
Ratio of spring travel to wheel travel. Typically 0.5-1.0 for most vehicles.
Compute the force produced (or needed) at a given deflection using F = k * x.
Compute the resonant frequency (Hz) for a sprung mass on this spring.
Spring rate (k)Medium spring
36.44

Stiffness - force required per unit deflection

Spring rate unitN/mm
Active coils (n)8
Mean coil diameter (D)70
36.44 N/mm
Very soft<5Soft5-15Medium15-40Stiff40-100Very stiff100+
Spring rate36.44
Wheel rate-

Spring rate: 36.44 N/mm

  • This spring has 8.0 active coils, a mean coil diameter of 70.00 mm, and a wire diameter of 10 mm.
  • Spring index D/d = 7.0, within the preferred 4-12 range for manufacturability and fatigue life.

Next stepEnable the wheel rate option to see the effective stiffness at the tyre, which is the value that determines ride and handling behaviour.

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