Hmmm, I've never seen a spreadsheet that records catches and calculates relative weight but with some work one could be designed. If you had columns where you entered the type of fish caught (could be a drop down menu) and the length of the fish caught and the weight of the fish caught then you could use an "if" formula (sometimes referred to as an "if/then" formula) to insert the "standard" weight for that species of fish and that length of fish into the worksheet. The relative weight could then be calcuated by comparing the weight of the "caught" fish to the standard weight for that length of fish. Sounds like an interesting but time consuming project.

Has anyone created anything like this?

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)