The online treatment calculators have come up before in discussion. If you look at them, you need to be aware that they only really apply to ductal carcinoma so if your cancer was one of the others, the results won't necessarily reflect the right stats. @zoffiel replied to a post a few months ago in more detail about these calculators which is worth reading if you're interested (I think the discussion was "Treatment Calculators"). That's not to say that they don't have any value, but I would suggest that you treat the results with caution and discuss them with your oncologist before using them as a basis for decision-making. My oncologist offered to go through one of these predictive tools with me (I can't remember now which one) but gave me a brief background on them and that it would not be reflective of my cancer at all (lobular).
And, of course, remember that they are just stats.