[CougarGA7]

That's true. It's all calculated to a "TNT equivalent" The yield of ANFO for example is .8 TNT equivalent (.8 something, I don't have the exact number in front of me) So, a ANFO device weighing 4500lbs would be equivalent to 3600 lbs of TNT.

[HuntsvilleTxVeteran]

There is one other thing about explosives, the time of
explosive front.
With hi-explosives it is in the microsecond range.
fertilizer based explosives are nearer 1 millisecond.
A fertilizer bomb is much less powerful in the open air.