Welcome to the coil spring rate calculation page. This is really quite simple. All you need to do is change a value in any of the boxes in the upper section and the boxes in the lower section will automatically display the calculated values. The default values are from the front coil springs on a 1995 Impala SS.
spring rate = | modulus of spring steel X wire diameter4 -------------------------------------------------------------------- 8 X number of active coils X mean coil diameter3 |