Try this:

=(C20-C1)/C1

Format the cell as percentage.

Hope this helps.

Pete

On Oct 3, 1:21*pm, GD wrote:
Hi - total brain freeze.

If I have two cells, say cells C1 and C20 - and in C1 is a projected output
figure, for example 19,000 and in C20 is the eventual action output which was
19,568 - how would I go about popping in a formula to C21 to show the
difference in percent between the forecast amount and the actual figure?!