Mechanical / Springs

Spring Rate Calculator

Estimate compression coil spring stiffness and deflection under an optional axial load.

Compression spring

Wire diameterMean coil diameterActive coilsShear modulusSpring steel is approximately 79.3 GPa.Applied loadOptional; clear to omit deflection.

Spring result

Spring rate7.2601 N/mm

Spring index 8

Spring rate: 7.2601 N/mm
Spring index: 8
Deflection under load: 13.774 mm

This basic relation assumes a close-coiled helical compression spring in its linear elastic range. End coils, curvature correction, solid height, buckling, fatigue and surge are not checked.