Spring Design Calculator

Wire Diameter (d) 1.0 mm
Thickness of the wire itself.
Outer Diameter (OD) 10.0 mm
External width of the spring coil.
Active Coils (Na) 5.0
Number of coils participating in deflection.
Free Length (L0) 50.0 mm
Unloaded length of the spring.

Calculated Parameters

Rate (k)
--
N/mm
Max Load
--
Newtons
Solid Height
--
mm
Max Travel
--
mm
Spring Index
--
C
Total Coils
--
Nt
Est. Weight
--
grams
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How It Works

The Spring Rate (k) determines how "stiff" a spring is. It is calculated using the formula:

k = (G × d⁴) / (8 × D³ × Na)
  • G: Shear Modulus of the material.
  • d: Wire Diameter.
  • D: Mean Diameter (Outer Diameter - Wire Diameter).
  • Na: Number of Active Coils.