there are a lot of calculators where you input info like your hash power, electricity costs and so on and you'll have the values...

The only problem is that this calculators doesnt consider the price that the coins will reach... I honestly think if you consider the price the coins can reach in the long run, mining could be really profitable... But if you're doing that as your mainsource of money, maybe it's not the best way to invest your  time and money...