Compression Spring Calculator
Size and verify a helical compression spring in seconds.
Open tool → HELICAL EXTENSION SPRINGExtension Spring Calculator
Calculate spring rate, initial tension, deflection and hook stress for a helical extension spring, with the working travel checked against the maximum allowable body length.
Open tool → EXTENSION SPRING WITH SWIVEL ENDSMovable Hook Extension Spring Calculator
Design extension springs with S-ring or swivel hooks that rotate 360°, so the spring stays aligned with the load direction and the end ring can be replaced.
Open tool → RECTANGULAR-SECTION COMPRESSION SPRINGDie Spring Calculator
Calculate load, compression ratio and stress for rectangular-wire die springs used in press tools and injection moulds.
Open tool → HELICAL TORSION SPRINGTorsion Spring Calculator
Calculate torque, angular rate, bending stress and maximum rotation for single-coil torsion springs with straight or bent arms.
Open tool → CONICAL COMPRESSION SPRINGConical (Tower) Spring Calculator
Design conical compression springs that telescope into a short solid height and resist lateral buckling in a compact space.
Open tool → BARREL-SHAPED COMPRESSION SPRINGBarrel Spring Calculator
Design barrel-shaped compression springs with a larger centre diameter for lateral stiffness inside a narrow bore.
Open tool → WAVE / CREST-TO-CREST SPRINGWave Spring Calculator
Calculate load and stiffness for single-turn and multi-turn wave springs made from round wire or flat strip.
Open tool → TWIN-COIL TORSION SPRINGDouble Torsion Spring Calculator
Design double-coil torsion springs, wound in the same or opposite direction, to obtain higher torque in a balanced, compact package.
Open tool → FLAT-STRIP SPIRAL SPRINGSpiral (Power) Spring Calculator
Design flat-strip spiral springs that deliver torque over many turns from a compact package.
Open tool → DISC / BELLEVILLE WASHERDisc Spring (Belleville) Calculator
Calculate load, stress and deflection for disc springs, including series and parallel stack combinations.
Open tool → EXTENSION SPRING WITH FLAT ENDSFlat-End Extension Spring Calculator
Design extension springs with flat end sections for stable clamping and a controlled, repeatable initial tension.
Open tool → FLAT-STRIP CONSTANT-FORCE SPRINGConstant Force Spring Calculator
Calculate constant force, available travel and bending stress for flat-strip constant-force springs used in reels and counterbalances.
Open tool →A three-step design loop
1. Fix the working point
Define the load, the travel and the installation space. A spring is designed around a working point, not around a free length.
2. Check the limits
Look at stress at the extreme position, solid height, coil bind and stability. These limits decide whether the design can be manufactured and how long it will last.
3. Send it to us
Export the calculation or copy the inputs. We will confirm the wire grade, the end form and the tolerances, then quote and sample.
Not sure which calculator fits?
Describe the mechanism and the load. We will point you to the right spring family and check the design with you.