Spring Design Calculator
Design helical compression springs. Calculate spring rate, deflection, shear stress with Wahl correction, and free/solid lengths.
Inputs
in
in
psi
lb
Results
Spring Rate (k)
17.97 lb/in
Deflection
0.56 in
Shear Stress (Wahl)29,153 psi
Solid Length1 in
Estimated Free Length1.64 in
Spring Index (C)10
How to Use This Calculator
- Enter the Wire Diameter (d) in inches — common music wire spring sizes range from 0.020" to 0.500".
- Enter the Mean Coil Diameter (D) in inches — the average diameter of the spring coils. The spring index C = D/d should be 4–12 for practical springs.
- Enter the number of Active Coils (N) that deflect under load. Closed-ground end springs add 2 inactive coils.
- Enter the Shear Modulus (G) for the wire material: music wire ≈ 11.5 Mpsi, stainless steel ≈ 10.0 Mpsi.
- Enter the Applied Force in lb to calculate deflection and stress at a specific operating load.
- Review Spring Rate (lb/in), Deflection (in), Shear Stress (psi with Wahl correction), and estimated Free Length to verify the design fits the installation envelope.
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