This is about right. I was going to say a rat’s ass is worth half-a-shit, but I’m not going to quarrel with anyone who thinks it is only one-third a shit. Also acceptable is 17% of a shit, if it’s a small rat (that’s one-sixth a shit, for you mathmaticians who know your shit . . . and Mark Hall).My conversion chart states 3 rat's asses per shit. It's a few years old though.