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, like paladins and rangers.
Please note that artificers, paladins, rangers, eldritch knights, and arcane tricksters gain spell slots at a different rate while multiclassing than they do while single-classed.
How many levels do you have in each of the following classes?
Artificer

Bard

Cleric

Druid

Sorcerer

Wizard

Paladin

Ranger

Eldritch Knight

Arcane Trickster

Warlock

You have this many spell slots from multiclassing:
1st
0
2nd
0
3rd
0
4th
0
5th
0
6th
0
7th
0
8th
0
9th
0
You get these spell slots back when you complete a long rest.
You have this many spell slots from pact magic:
1st
0
2nd
0
3rd
0
4th
0
5th
0
You get these spell slots back when you complete a short rest or a long rest.
You can use all of your spell slots interchangeably, but you should track your warlock slots separately, because they replenish on a short rest.