Spring Deflection Calculator

Inputs

View results
Diameter of the spring wire.
mm
Center-to-center across the coil (outside diameter minus wire diameter).
mm
Coils that actually deflect.
Load applied to the spring.
N
Unloaded length, used for travel-to-solid and buckling checks.
mm
Sets shear modulus and allowable stress.
Sets inactive end coils and buckling end-fixity.

Results

Default result
Edit inputs
Deflection(x)
10.01mm
Pass

Within available travel.

Also computed

Spring rate(k)1.239N/mm

Spring index(C)Pass10

Corrected shear stress(τ)Pass361.5MPa

Within allowable.

Allowable shear stress995MPa

Travel to solid30mm

Solid height10mm

Force vs DeflectionThe curve shows the same spring rate used by the deflection result; the marker is the entered applied force.Force vs Deflection0102030400102030applied loadDeflection (mm)Force (N)
The curve shows the same spring rate used by the deflection result; the marker is the entered applied force.
Method notes 3 notes
  • Deflection is calculated from x = F / k after k is found from the spring geometry and material.
  • Static load only; fatigue, set and relaxation are not included.
  • Use the stress, travel-to-solid and buckling warnings before treating the deflection as usable travel.

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