Helical Spring Calculator
A helical compression spring is governed by wire diameter, coil diameter, active coils, material shear modulus and working deflection.
helical spring calculator coil spring calculator spring rate and stress calculator
Helical spring rate
k = G * d^4 / (8 * D^3 * Na)
Stress check
tau = Kw * 8 * F * D / (pi * d^3)
Design workflow
- Choose wire and mean coil diameter.
- Set active coils and free length.
- Pick material and end type.
- Check rate, stress, travel to solid and buckling.
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.