Spring calculators
Free spring calculation tools — rate, force, torsion and unit conversion.
Compression spring calculator
Calculate spring rate, maximum safe load, deflection and stress for your compression spring. Enter the dimensions and get engineering results instantly.
CompressionSpring rate (constant) calculator
Find the spring rate (N/mm and lbf/in) of a helical spring from wire diameter, mean diameter and number of active coils.
CompressionSpring force calculator
Calculate the force (load) a compression spring exerts and the maximum safe load before the material yields.
ExtensionExtension spring calculator
Calculate the rate, initial tension and maximum load of extension springs with hooks. Enter the dimensions and the hook-to-hook length.
TorsionTorsion spring calculator
Calculate the angular rate (N·mm/°), maximum safe torque and maximum angle of torsion springs with legs.
ConverterSpring unit converter
Convert length (mm ↔ in), force (N ↔ lbf), spring rate (N/mm ↔ lbf/in) and torque (N·mm ↔ lbf·in) — the units springs are specified in.