A mining calculator does exactly what it sounds like. It calculates how much Bitcoin you would receive if you had an ASIC. With most good mining calculators, all you need to enter in the calculator is your hashrate, electricity rates, and wattage consumption of the unit.
If you are having trouble looking for a good calculator, We suggest either https://tradeblock.com/mining/ or http://www.bitcoinx.com/profit/ . They both have up-to-date information and fully adjustable parameters to adjust your own specific situation.
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