Math Question

[JoshEngleman]

I was wondering if anyone with some stats skills can help me out here. I just started keeping track of my bets in excel. I was wondering if anyone knows how to do a confidence interval based on my results. I have bets won, lost and my win pct listed and next to the win pct, I would like to have a confidence interval next to the win pct. Does anyone know how to do this?

I know that Excel has the =confidence() function but I'm not sure what I would put in as my standard deviation. Anyone that can help me out would be a god.