If you don't find an online calculator,you can estimate your profit on your own I think. See how much you're earning in 1 hour and how much power your CPU consums per hour and use this simple formula:
Profit= Mined coins value - ( electricity cost per kWh x Electricity consumption)
If you are using a mining pool you can also substract the pool fees.I hope this helps.

You can ask this guy, bantano. He said he's from the banano core team.