Design Home Springs Overview Design Considerations Spring Buckling Extension Springs Natural Frequency Calculators Overview Spring Force Deformed Length Spring Rate k Force & Stress Range of Rates k Spring Designer Spring Designer Equations Cyclic Loads: Resonance Cyclic Loads: Fatigue Fatigue Equations Resources Bibliography
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 This calculator computes all parameters (spring rate, maximum load, maximum stress, solid height, coil pitch, coil angle, wire length, resonant frequency, shear modulus, and spring mass) related to a compression spring from basic geometry and material data input. In determining the total number of coils in the spring, the calculator assumes that the ends of the spring are squared.
Inputs
 Diameter of spring wire, d: mm cm in Outer diameter of spring, Douter: mm cm in Free length of spring, Lfree: mm cm in ft Number of active coils, na: Youngs modulus of material, E: GPa Mpa psi ksi Poisson ratio of material, n: Density of material, r: kg/m^3 g/cc lbm/in^3
 Spring constant, k: 2.60  lbf/in N/m dyne/cm lbf/in Maximum load possible, Fmax: 1.69  lbf N dyne gf kgf lbf Maximum shear stress possible, tmax: 51.7  ksi Pa kPa Mpa psi ksi Maximum displacement possible, Ldef: 0.650  in mm cm in ft Length of wire required to make spring: 14.7  in Solid height: 0.350  in Distance between coils in free spring: 0.125  in Rise angle of coils: 4.89  deg Lowest spring resonant frequency, fres: 256  Hz Hz kHz cpm Shear modulus of material, G: 76.9  Gpa GPa Mpa psi ksi Mass of spring: 1.73  gm kg g lbm oz

Equations Behind the Calculator
 See the companion page to view the equations for this calculator.
3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.