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This calculator is straight up taken from Jeff's old minorleaguesplits.com site that I wanted to mirror and make sure it remained running. Here's his description:
Enter a player's minor league stats, select his current league and team, and this will spit out equivalent stats at the major league level. You can also select a team and league for the equivalent stats. So in addition to traditional MLEs (how would a minor leaguer fare in the majors?), you can see how a player would do in a different league/level, or in a different park in the same league.
Besides Jeff's data, ML Splits was developed entirely by Kyle Boddy in PHP 5.3.x, CodeIgniter 2.0, MySQL 5.0.9, and jQuery 1.5.1. We use Springloops v2 for VCS and Site5 for hosting. They are both awesome.
I also made the Advanced Baseball Injury Database if you are interested in that sort of thing.