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

How to determine spell slots for my multiclass character in 5e? Page spell slot calculator 5e Calculate the total amount of spell slot levels a sorcerer has at each level and say they have to spend half of that The idea came from the spellbinding mystery slot Spell Slots You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, and half your

spell slot tracker If you are able to cast the same spell and you have it prepared , you cast it, creating a counterspell effect