Simple. Work out the output of the unit you are looking at purchasing. Let's use a 6 card GPU that mines at 31 Mh's per card as an example. This would be 186 Mh's. These cards are also setup to mine Ethereum.
- Head over to Cryptocompare and load up the Mining Calculator. This allows you to calculate the current rate at the current Ethereum value and difficulty rating.
- Enter the electricity usage eg 110w per card x 6 (Let's presume 660w)
- Enter your electricity costs at your current provider rate (Let's presume 0.33c per KWh)
- Your profit per month will be generated at the current value. This takes into consideration all electricity costs as well.