# Spring Constant

Written by Jerry Ratzlaff on . Posted in Constants

Spring force constant, abbreviated as $$k_s$$, also called spring constant, is the ratio of opposing force to the displacement from the origional position or how much force is needed to change a springs distance.

## Spring Constant formulas

$$\large{ k_s = - F \; d_s }$$

$$\large{ k_s = \frac {F} {d_s} }$$

Symbol English Metric
$$\large{ k_s }$$ = spring force constant $$\large{lbf}$$ $$\large{N}$$
$$\large{ d_s }$$ = spring displacement $$\large{in}$$ $$\large{mm}$$
$$\large{ F }$$ = spring force $$\large{lbf}$$  $$\large{N}$$