linear_scaleMechanical Design

Spring Calculator

Calculate compression spring rate, spring index, and force for a given deflection.

check_circleSpring Rate: Force per unit deflection.
check_circleSpring Index: Ratio of coil to wire diameter (ideal: 4-12).
check_circleForce Calculation: Force at specific deflection.
check_circleDesign Validation: Check spring feasibility.

Spring Calculator

Units:

mminch

Wire Diameter

Mean Coil Diameter

Active Coils

coils

Shear Modulus

GPa

school Theory & Formulas

Spring Rate Formula:

k = Gd⁴ / (8D³n)

Where:
- G = Shear modulus (79 GPa / 11.5 MSI for steel)
- d = Wire diameter
- D = Mean coil diameter
- n = Active coils

Spring Index C = D/d
Ideal range: 4-12