When I input information into those calculators, I'm not too concerned about the ESC or battery. I normally pick an ESC about the size I'd use or larger and the largest rated battery listed. I'm not sure, but I'm guessing that the ESC doesn't make as much difference as all those other parts. The battery can limit the power output of the motor system. If the battery isn't up to the task of providing the current, you'll see lower power output numbers.
My concern was to know the maximums so I could ensure I wasn't overtaxing the ESC, battery or motor.
If the motor isn't listed, you pick one that's close to the one you want to examine by looking at weight and KV. When I was starting out, I'd be looking as specs from maxxprod, aircraftworld, and various others. Usually, you can find something similar.
There is a relationship between the weigh & kv of one motor and that of another of the same weight and kv. You can expect them to be similar in performance. Not exactly, as some motors are just better quality and more efficient.
For the most part, Tower has a great site, but I have noticed occasionally specs that don't quite make sense. Lots of information to input! One question though: Axi has gold and silver lines and the specs are different, if I recall, between two similarly numbered motors.
This is the online calculator I use:
http://brantuas.com/ezcalc/dma1.asp
There are many users here who would be happy to input some numbers into motocalc for you.
http://www.motocalc.com/
In the end, the calculators are only a guide. They aren't 100% accurate so the best thing to do is use them as such and get a meter to know for sure what's going on in your plane.
And get a battery rated for max amps of your system. One of the myths that I had to unlearn was that you can cut amp draw by using a lower throttle setting. ESC's work by either being on or off for a different percentage of the time. For example, the circuit may only be 'on' for 10% of the time at low throttle, but while on, it's drawing the max current during that time for that particular system.
Keep at it. It's a bit frustrating at first, but it's all good.