What spell slot count formula can I use to base my homebrew

DnD 5e Multiclassing: A Practical Guide spell slot calculator 5e This calculator uses the multiclassing rules found in the 5th Edition Player's Handbook, with the assumption that artificers will be treated as half-casters, spell slot Spells cast from scrolls do not consume spell slots when cast, nor do most spells granted by magic items Level 0 spells are called cantrips,

spell slot counter You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, and half