I tried to find an online tool that would allow me to calculate how many BTC (or portions of it) I might be able to mine with my computer, but I couldn't find an answer that is exhaustive.
Is there any such tool?
Even though the comments were pretty clear about, "don't even try this", you seem insistent.
Mining Power is measured in Gh/s, or Giga-Hashes per second, which means how many Billion hashes can a computer try every second.
The mainstream ASIC processor, AntMiner S9, can do about 13 Th/s (13 Terra-hashes, or 13,000 Gh/s).
A good graphics card GPU can do about 1 Gh/s.
So you would need on the order of 13,000 graphics cards to come close to a single ASIC processor.
Since the S9 has a breakeven point around 1 year, it would take your PCs about 13,000 years to make enough money to buy a single S9, and the PCs would be far more expensive upfront, and use far more electricity along the way.
Bluntly put, if you really really focused with PC mining, you'd be extremely lucky to make about $3 a year.