Confusion on ROI???

[craig r]

I am confused on how to figure out ROI. I thought it was the amount won divided by the amount invested. Is this incorrect. For example right now i have placed in ~41.5% of SNG's out of 159 tourns. I have invested 874.5 and profited 225.5. So would my ROI be:

225.5/874.5=25.78%

That seems low for the amount I am placing and compared to other's ROI.

Thanks for the help,

Craig R.

p.s. these are $5 sng's