The "load" system is actually quite simple. It's a base 3 system... ie 3 Buttloads in a Crapload, 3 Craploads in an A**load, etc. Conversion to metric is 1:1.72. ie a standard Buttload = .58 metric Buttloads.
The progression is buttload, crapload, a**load, sh**load, f***load.
Hope this helps.
(We had strange discussions when I was doing tech theater in school.)