Compression Spring Design Calculator

Spring rate and estimated load for a helical compression spring.

Shear modulus G (GPa)Wire diameter d (mm)Mean coil diameter D (mm)Number of active coils nDeflection (mm), optionalCalculate

Equation

Spring rate k = G·d⁴ / (8·D³·n). Load F = k·x.

Assumptions

Round wire, ideal helical geometry, no end-coil or solid-height effects, static loading only.