Multiclass Spell Slot Calculator
Multiclassing two spellcasters? Your slots don’t add together — you work out a single combined caster level and read your slots off one table. Enter your classes and levels and this does it for you, off the same engine that builds full character sheets: Warlock Pact Magic kept in its own pool, the 2014/2024 rounding handled, and Eldritch Knight, Arcane Trickster, and Artificer all covered.
Paladin 5 (half caster, +3) · Sorcerer 5 (full caster, +5) → combined caster level 8 (Paladin/Ranger round up).
| 1st | 2nd | 3rd | 4th |
|---|---|---|---|
| 4 | 3 | 3 | 2 |
Watch the trap: you have slots above 3rd level, but each class only learns spells up to the level it could reach alone — so you upcast lower spells into the big slots until one class catches up.
How to calculate multiclass spell slots
- Add together every level in your full casters — Bard, Cleric, Druid, Sorcerer, Wizard.
- Add half your Paladin and Ranger levels — rounded down in 2014, up in 2024.
- Add a third of your Eldritch Knight / Arcane Trickster levels, and half your Artificer levels (Artificer rounds up, both editions).
- Leave out Warlock levels — Pact Magic is a separate short-rest pool — then read that combined caster level off the full-caster slot table.
What this calculator gets right (and most don't)
- Warlock Pact Magic stays separate — its own short-rest pool, never folded into the combined level.
- Artificer rounds up in both editions — the quirk the most popular calculators get wrong (they round down).
- Edition-aware — 2014 rounds half-casters down, 2024 rounds them up; one toggle.
- Third-casters included — Eldritch Knight and Arcane Trickster contribute their one-third.
- The “big slots, small spells” trap is flagged — when your slots outrun the spells your classes can actually learn.
- Every number is computed by the engine, the same one that builds complete, rules-accurate character sheets — and cross-checked against D&D Beyond.
Want the rules behind the numbers?
This page is the tool; the multiclassing guide is the why — the ability-score prerequisites, the proficiencies you actually gain, the ASI delay, Extra Attack not stacking, and the rest of the gotchas. Or skip all of it and describe a multiclass character in one sentence and the generator builds the full sheet — combined slots, each class’s own save DC, Pact Magic kept separate, every feature scaled correctly.
Frequently asked questions
How do multiclass spell slots work?
You don't add each class's slots together. Add your full-caster levels, half your half-caster levels (Paladin/Ranger), a third of any Eldritch Knight or Arcane Trickster levels, and half your Artificer levels, to get one combined caster level — then read your slots off the multiclass table. Warlock Pact Magic is separate.
Do you add the spell slots from each class together?
No — that is the most common mistake. Two spellcasting classes use a single combined caster level, not the sum of two separate slot tables. This calculator works out that combined level for you.
How is Warlock Pact Magic handled?
Separately. Warlock levels do not count toward the combined caster level; Pact Magic is its own pool of slots that recharge on a short rest. The calculator shows it on its own line so the two pools are never mixed up.
How is the Artificer counted?
Half your Artificer levels, rounded UP, in both the 2014 and 2024 rules — so even a single Artificer level adds one to your combined caster level. This is the rule most calculators get wrong (they round it down).
Does this support the 2024 rules (5.5e)?
Yes. Toggle the ruleset at the top. The one math difference is half-caster rounding: Paladin and Ranger levels round down toward the combined level in 2014 and up in 2024. Artificer always rounds up.
Why do I have high-level slots but no high-level spells to cast?
Your combined caster level sets your slots, but each class only learns spells up to the level it could reach on its own. So you can hold a big slot with nothing high-level to put in it until one class catches up — you upcast lower spells in the meantime. The calculator flags this.
Is it free?
Yes — free, no login.