this is a calculator i have been playing with for a while. everybody tells me that its not an adequate calc but for the past couple months it has done pretty good and getting close to where i would be with miners running. we have seen ~30% increases for the past 5 diff jumps until the most recent one which was over 40% but with all the hardware coming out, 40's or better may be what we see for a while. but who knows.

it seems that you cant get in to mining to be profitable anymore unless you have massive amounts of money to spend on hardware/power/cooling. at least btc/usd is trending upwards right now so maybe that can help keep the low output of miners a still survivable market for smaller mining setups