and again .....For calculating your mining income , possible profitability you need to know a few things :
How much $ is your mining PC ?
What is the total power draw for your system at the wall ?
How much $/kwh you paying for electricity included tax and another fees ?
What is the max hashrate you can get from ur rig ?
What wallet / exchage you going to use (what % they charging you for exchange ) ?
What mining software are you going to use ? ( its free or have some % developer fee )
What pool are u going to use ? ( pool fee% )
What ROI (return of investment) do you prefer ...
what any of the calculators telling you today , that is just for today ... if the difficulty going higher , your ROI can be doubled easy and ur mined coin going to be less ....
when you have all this information , you can use any mining calculator
there is a few example's :
for eth:
http://www.coinwarz.com/calculators/ethereum-mining-calculatorfor zcash:
http://www.coinwarz.com/calculators/zcash-mining-calculatorfor xmr
http://www.coinwarz.com/calculators/monero-mining-calculator