ROI in Excel

=sum(20.58/70*100)

=29.4%

OK

Cheers Winchy. You're a hero. So today's ROI was not too bad for me as a beginner. This time next year........................

Is that correct Winchy? if he bet £70 on 10 bets throughout the day, then his actual investment would have been £700, opposed to £70, which would mean that his profit would be approx 3-4%

The total staked during the day added up to £70 (over a number of different races and at varying stakes). The balance at the end was £90.58 giving me a profit of £20.58

He didnt say 10 bets, I read it as £70 in total for his number of bets....if this is wrong though you need to replace 70 with the total amount bet out during the day

whichever way you look at it winchy has come up with the calculation which works for me.

sorry, misread the initial comment! :-)