Use the inputs below to calculate variance.  Note: For "win amount" you would put the buyin minus the rake in the box.  For "loss amount" you would put the buyin plus the rake in the box.  Therefore, for the $11 +.50 turbo speed, you would put in "10.5" for win amount and "11.5" for loss amount.

For reference, discounting rakeback, on most poker rooms a 60% winrate will be just under 15% ROI and a 55% winrate will be just above 5% ROI.