⚙️ Mechanical Design Spring Calculator
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SpringCalc
Engineering Tool
Mechanical Design

Spring Selection
Calculator

Calculate spring rate, stress, deflection and verify spring suitability for compression, extension and torsion springs.

Spring Type
🗜️
Compression
Resists compressive force
↔️
Extension
Resists tensile / pull force
🔄
Torsion
Resists rotational moment
Spring Diagram & Parameters
Spring Rate (k)
N/mm
Enter parameters and calculate
Spring Index (C = D/d)
Recommended: 4 – 12
Max Torsional Stress
MPa
0Safe
Detailed Results
Wahl Factor (Kw)
Wire Length
Solid Length
Free Length
Max Deflection
Key Formulas
Spring Ratek = Gd⁴ / 8D³Nₐ
Spring IndexC = D / d
Wahl FactorKw = (4C−1)/(4C−4) + 0.615/C
Max Stressτ = Kw · 8FD / πd³
Deflectionδ = F / k
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The go-to reference for mechanical engineers. Covers springs, gears, shafts, belts, bearings & more — perfectly aligned with the calculators on this page.
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