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Spring Rate Calculator
Calculate spring constant from material and geometric properties
📖 Spring Rate
Spring rate (spring constant) is the force required to deflect a spring by a unit distance. It depends on wire diameter, coil diameter, number of coils, and material modulus.
📊 Result
💡 Tips & Information
- Spring rate is measured in N/m or lb/in
- Formula: k = (G × d⁴) / (8 × D³ × n), where G is shear modulus, d is wire diameter, D is coil diameter, n is number of coils
- Steel shear modulus: ~80 GPa, Stainless steel: ~70 GPa
- Smaller wire diameter and more coils = lower spring rate
- Larger coil diameter = lower spring rate