Spring calculators
Free spring calculation tools: spring rate, force, torque, weight and unit conversion, running on the same engine as the designer.
Calculators by spring type
Compression spring calculator
Calculate spring rate, maximum safe load, deflection and solid height for your compression spring. Enter the dimensions and get engineering results instantly.
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 (per degree), maximum safe torque and maximum angle of torsion springs with legs.
ConicalConical spring calculator
Calculate the initial rate, maximum load and deflection of conical (tapered) springs. Enter both end diameters and see the progressive characteristic.
Sizing and conversion
Spring constant calculator
Find the spring constant (spring rate) in lbf/in and N/mm 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.
Load and travelRequired spring rate calculator
Find the spring rate your application needs from load and travel. Enter one or two working points and get the required rate in lbf/in and N/mm.
WeightSpring weight calculator
Calculate the developed wire length and the weight per piece and per thousand of your spring. Essential for material cost, plating and freight.
ConverterSpring unit converter
Convert length (in and mm), force (lbf and N), spring rate (lbf/in and N/mm) and torque (lbf·in and N·mm): the units springs are specified in.
Design the spring and get an instant quote
Open the 3D designer, tune the dimensions and see quantity pricing with a technical drawing and stress analysis.
Open in designer