Enter each crafting job's current level and current EXP in that level. The ledger takes it from there — for every job, it works out exactly how many of each Rarefied collectable to craft and turn in to level 100 (or an earlier target level, if you set one).
Below level 71, class quests (1-15) and Cosmic Exploration (15-71) are how you level. Cosmic Exploration needs Endwalker's MSQ finished first; if you haven't, Ishgardian Restoration covers 20-71 stretch instead. From 71 onward, Cosmic Exploration is still an option, but this tool models the collectable route. It assumes 100% quality (+300% bonus EXP) and max collectability on every turn-in, with no external buffs like rested EXP or food. "Craft my own components" prices out that collectable's full ingredient tree at NQ. All 8 jobs are simulated together in a handful of level windows when crafting your own components, as logs for those components unlock at specific intervals (71-75, 75-80, 80-85, 85-90, 90-95, 95-100). Picking a data center and world pulls current market prices from Universalis to estimate gil cost for each job's turn-ins. "Gather my own raw materials" treats regular Miner/Botanist nodes as free instead of priced in that "crafting your own" total; timed (ephemeral/unspoiled/legendary) nodes, fishing, and dungeon-drop/GC-exchange materials stay priced unless their own toggle is switched on too.