We (Technical Support) are sometimes asked why the r value for a vertical parabolic curve is off by a factor of 100, when it appears (by looking at the equations) to be the reciprocal of the K value.
The difference between the two equations is the length value used in each.
For K value: K = l / (g2 - g1) where l = length of curve
For r value: r = (g2 - g1) / L where L = length of curve in stations
Therefore, with a unit station length = 100, r = 100 * ( 1 / K )