Spring Stress Correction Calculator
Spring stress correction accounts for coil curvature and direct shear. Use the compression spring calculator to apply the Wahl factor to load, wire diameter and mean coil diameter.
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Corrected stress formula
tau = Kw * 8 * F * D / (pi * d^3)
Wahl factor
The Wahl factor depends on spring index C = D/d and raises the simple torsional stress for real helical spring curvature.
Kw = (4C - 1) / (4C - 4) + 0.615 / C
Use the live calculator
Enter wire diameter, mean coil diameter, active coils, material and working deflection to compare corrected stress against allowable stress.
Related pages
- Compression spring calculator - rate, force, stress, solid height and buckling checks.
- Wahl correction factor - stress correction formula and spring-index context.
- Spring buckling calculator - critical deflection, free length and diameter checks.
- Spring rate calculator - spring constant from wire, coil and material data.