Hi All

I have a worksheet that interprets values from a #255-#0 number system
and need to convert them to a 0%-100% number system and visa versa.
#255 = 0% . #250 = 1% and so on.

So I have made 2 columns of numbers, one for each number system so each
value from one number system lines up (closely) with it's corresponding
value from the other. Column R is 0-100% Column S is 255- 0.

I am using this formula now:
=IF(ISERROR(INDEX($R$9:$S$3094,MATCH(AV44,$S$9:$S$ 3094,FALSE),1)),"
",INDEX($R$9:$S$3094,MATCH(AV44,$S$9:$S$3094,FALSE ),1))

The problem I am having is that the 255 - 0 column may not have the
exact value I am looking for or visa versa, and the function returns a
blank cell.

How do I change the function to get the closest value either higher or
lower than the exact number? At the most I am missing exact values by
..01. Can OFFSET be added? If so how?

Thanks in advance!

Bob