("Energy Simulation Tools" should probably be a Sub-Forum. I have compiled a pretty big list of other tools that Ecorenovators might want to try.)
Since this blog attracts an international audience, Unit Conversion is an integral part of information exchange.
Here is an Energy Conversion utility with a handy "sliding" interface.
Even better, it is in *.SWF format, and you can save it to your local computer, bookmark it and run it whenever you want.
Regards,
-AC_Hacker