https://www.fantasygrounds.com/forums/showthread.php?57446-Advancement-XP-extension-for-Pathfinder

In settings, you can set your campaigns experience rate (fast, medium, slow, 3.5e, off).  When you assign experience to players, it will auto populate all fields based on the rate that you chose for your campaign.  Additionally, this extension will notify players when they accumulate enough experience to level up.