If you need inch pounds... the foot pound wrench is very likely too high in the range to be used even with the conversion. (Which if I remember right at the moment is multiply or divide by 12 depending which direction you are going.)
Example... 80 inch pounds is only 6 2/3 FP if I did the math right. You need a really low range FP wrench to read that.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurasic Park)
The Ogre's Fiero Cave (It's also at the top of every forum page...)