Lethe
Captain
Well actually there is a chart that convert mass of 300kg speeding at mach 8 which is equivalent to 1.70 metric ton of TNT. Now this is just kinetic energy not counting any explosive.
For the comparison to be valid, all of the kinetic energy must be transferred to the target. This may or may not be a realistic assumption. Worst-case scenario, the impact vehicle goes in one side and out the other while transferring very little energy to the target.
(Which is why PLANAF needs a next-generation fighter ... )