How much C4 = 1 kT of TNT = a shallow 4.2 in North Korea?

Answer 1

Typically, C4 has an equivalence rating to TNT of 118%. This means C4 is 18% more power (velocity of detonation) than TNT.

Based on that information, 1kT of C4 would have the force of 1.18kT of TNT.

C4's desirability isn't in it power, it's in its versatility. It's stable and can be manipulated and stretched into nearly any shape.

Answer 2

You can not get enough C4 to do that!