CALCULATORS 
COMPRESSION COIL SPRINGS 
Calculator 
Usage 
Compression Springs Design (Dimensional or Rate Based)

Calculates compression springs parameters for wire springs according to dimensional or rate based
inputs. Calculation results generated by the calculator are spring rate, solid height, torsional shear stress at solid height, buckling check, outer diameter expansion, loaddeflection curve, stress–deflection curve, etc. 
Compression Springs Calculator (Load Based Design)

Calculates compression springs parameters for wire springs according to load based inputs. Load
based inputs can be Load 1 @ height 1 and spring rate, Load 1 @ height 1 and
free height and Load 1 @ height 1 and Load 2 @ height 2 Calculation results generated by the calculator are spring rate, solid height, torsional shear stress at solid height, buckling check, outer diameter expansion, loaddeflection curve, stress–deflection curve, etc. 
Critical frequency of helical springs

Calculates the natural
frequency of a coil spring whose one end is against flat plate and the other end is moved by a cyclic sinewave motion. 
Compression springs design for fatigue loading

Calculates stresses occurred at compression springs which work under dynamic loading. Gerber, Sines and Goodman fatigue failure theories are used for the calculations. 
SUPPLEMENTS 
Allowable Torsional Stresses for Compression Springs

Maximum
allowable torsional stresses for coil compression springs in static applications. 
End Conditions for Compression Springs Stability Analysis

End condition constants for coil compression springs stability analysis 
Formulas for Compression Springs Design

List of formulas used in the compression springs design calculators. 
Formulas for Compression Springs Fatigue Design

Formulas
for compression springs fatigue design 
Compression Springs Terms and Definitions

Compression springs
terms and definitions 
Spring Steels for Coil Springs

List of spring steel materials given in calculators. 
EXTENSION COIL SPRINGS 
Calculator 
Usage 
Dimensional design of extension springs

Calculates dimensional parameters of extension springs with the knowledge of different parameter sets such as spring rate & free length, spring diameter & free length, preload & spring rate, spring diameter & spring rate etc. Calculation results generated by the calculator are spring height, number of body coils, spring body length, spring rate, spring initial preload range, spring index. 
Stress analysis of extension springs for static loading

Calculates shear and tensile stresses on extension springs with full twisted end for static loading case. Calculations are done with the knowledge of spring wire diameter, spring diameter and maximum working load. Calculation results generated by the calculator are shear and tensile stress at spring end, shear stress at spring body, factor of safety values for the points where the stress values are calculated. 
Stress analysis of extension springs for fatigue loading

Calculates fatigue resistance of ordinary
extension springs with full twisted end.
This calculator can be used to check critical
points fatigue resistance against dynamic loading. Gerber and Goodman failure
criterias are used in this calculator for the fatigue evaluation of the spring. 
SUPPLEMENTS 
Allowable Stresses for Extension Springs

Maximum
allowable stresses for helical extension springs in static and fatigue applications 
Formulas for Extension Springs Static Design

List of formulas used in the extension springs static design calculator. 
Formulas for Extension Springs Fatigue Design

List of formulas used in the extension springs fatigue design calculator. 