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)
10.01 mm
Pass

Within available travel.

Also computed

Spring rate (k) 1.239 N/mm

Spring index (C) Pass 10

Corrected shear stress (τ) Pass 361.5 MPa

Within allowable.

Allowable shear stress 995 MPa

Travel to solid 30 mm

Solid height 10 mm

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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