I found a calculator from what seems to be a defunct faction. Could a kind sentient please tell me if it does reliable calculations? Or perhaps someone knows of a better RM extraction cost calculator somewhere?

http://okd.swc-factions.net/rmcalc.php?type=extract

I am not smart enough to create a calculator like that. Thanks!

if its an old faction, the costs probably won't be up to date.

OKD only dissolved a few months back, if I recall. They should be just fine.