Engineering tool · V0.7

Compression Spring Calculator

Use standard concept-stage helical-spring relationships to explore wire diameter, coil diameter, active coils and load.

Wire diameter d (mm)

Mean coil diameter D (mm)

Active coils n

Shear modulus G (GPa)

Axial load F (N)

Spring rate k—

Deflection under F—

Corrected shear stress—

Spring index C—

Enter spring geometry.

k = Gd⁴/(8D³n) · C = D/d · Kᵥ = (4C−1)/(4C−4) + 0.615/C

Concept-stage helical compression-spring equations. End conditions, inactive coils, solid height, buckling, surge, fatigue, preset/scragging, tolerances and material-specific allowable stress are not fully represented.