Profit is calculated via the deduction of expenses from income.
The income consists of daily payouts which size depends on the hashrate. In order to calculate an estimated income using the hashrate you will need to include it in calculator below (set all Power values to zero):
Bitcoin - for SHA-256
Next, deduct the maintenance + electricity fee of 0.0035 USD per 10 GH/s of SHA-256 .
The sum you end up with is your estimated profit.