Helical Spring Rate Calculator

Calculate the spring rate $ k $ using: $$ k = \frac{G \, d^4}{8 \, D^3 \, n} $$

* $ G $ is the shear modulus (N/m²), $ d $ and $ D $ are in millimeters (mm) and will be converted to meters, and $ n $ is the number of active coils.

Step 1: Enter Parameters

Shear Modulus, $ G $ (N/m²):

e.g., 80 GPa = 80000000000 N/m²

Wire Diameter, $ d $ (mm):

e.g., 5 mm

Mean Coil Diameter, $ D $ (mm):

e.g., 50 mm

Number of Active Coils, $ n $:

e.g., 10 coils

Step 1: Enter Parameters

Calculated Spring Rate