The conversion chart for a regular moves base power to its Max-equivalents base power can be found here. Like Staka mentioned, there is one formula used for Max Knuckle and Max Ooze that gives them a decreased power, and another formula used for the other 16 types of Max moves. It's also worth noting that this table is only a general rule for moves with a standard base power, and doesn't include multi-hit moves, moves with set damage, or moves that vary in power, as those are determined on a case-by-case basis.
Hope this helped!