While the calculators are not 100% up to date right now, they were last updated at the beginning of January... so they can't be horribly outdated yet.

As for them being inaccurate: can you provide the numbers you used which gave an incorrect result? As far as I know, the algorithm used for calculating is correct, and there haven't been any reports of it being inaccurate before...
QUOTE (Agent F)
The calculators will be redone with the upcoming site update. I'm sure Sal will reconfigure them to be further accurate and also add other events and whatnot to those calcs that need them.
Along with being faster, less resource intensive, and completely updated at the time of their release, they'll be much easier to keep updated in the future.