Multiclass Spell Slot Calculator

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Reviewed and verified by: **Elminster Aumar, Archmage Emeritus**.

The Multiclass Spell Slot Calculator is an essential tool for players of Dungeons & Dragons 5th Edition. It correctly determines the total number of spell slots your character has access to, based on the levels you have gained in various spellcasting classes, following the official multiclassing rules.

Multiclass Spell Slot Calculator

Multiclass Spell Slot Calculator Formula

$$E = L_{Full} + \lfloor L_{Half} / 2 \rfloor + \lfloor L_{Third} / 3 \rfloor$$

Where $E$ is the Effective Spellcasting Level, and the spell slots are determined by the D&D 5e Spell Slot Table for level $E$.

Formula Source: Player’s Handbook Errata | Additional Source: Official Sage Advice Compendium

Variables

  • Full Caster Levels ($L_{Full}$): Total levels in classes that gain full spellcasting progression (e.g., Bard, Cleric, Druid, Sorcerer, Wizard). These levels are counted fully.
  • Half Caster Levels ($L_{Half}$): Total levels in classes that gain half spellcasting progression (e.g., Paladin, Ranger). These levels are divided by 2 (rounded down).
  • One-Third Caster Levels ($L_{Third}$): Total levels in classes that gain one-third spellcasting progression (e.g., Eldritch Knight, Arcane Trickster). These levels are divided by 3 (rounded down).

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What is Multiclass Spell Slot Calculation?

In Dungeons & Dragons 5th Edition, if a character has levels in more than one class that grants spellcasting (excluding Warlock, which uses Pact Magic), the character’s spell slots are determined by combining their casting ability. This ensures that a multiclass character doesn’t gain the full spell progression speed of a single-class character, maintaining game balance.

The core mechanism involves calculating an “Effective Spellcasting Level.” This level is the sum of all their full caster levels, half of their half-caster levels (rounded down), and one-third of their one-third caster levels (rounded down). The resulting number is then cross-referenced against the standard 5th-level spellcaster table to find the total number of available spell slots from 1st through 9th level.

It is important to note that while this calculation determines the total number of spell slots you have, it does **not** determine the maximum level of spell you can prepare or know. That maximum is still dictated by the highest-level spellcasting class you possess, but the available slots can be used to cast any spell you know or have prepared, up to the slot’s level.

How to Calculate Multiclass Spell Slot (Example)

Let’s calculate the spell slots for a character who is a Level 3 Wizard and a Level 2 Paladin.

  1. Identify Class Categories: Wizard is a Full Caster ($L_{Full}=3$). Paladin is a Half Caster ($L_{Half}=2$). One-Third Caster levels are 0 ($L_{Third}=0$).
  2. Calculate Effective Spellcasting Level ($E$): $$E = 3 + \lfloor 2 / 2 \rfloor + \lfloor 0 / 3 \rfloor$$ $$E = 3 + 1 + 0$$ $$E = 4$$
  3. Determine Spell Slots: Look up the D&D 5e Spell Slot table for a Level 4 spellcaster.
  4. Result: A 4th-level spellcaster has 4 first-level slots and 3 second-level slots. The character has a total of 7 spell slots.

Frequently Asked Questions (FAQ)

Is Warlock Pact Magic included in this calculation?

No. Warlock’s Pact Magic is a separate resource and does not combine with the spell slots from other spellcasting classes. They maintain their Warlock spell slots independently.

What happens if my Effective Spellcasting Level ($E$) is above 20?

The spell slot table only goes up to level 20. If your Effective Spellcasting Level exceeds 20, you use the spell slot progression for level 20.

Does the Artificer count as a Full Caster?

No. Artificer is considered a Half Caster for the purpose of multiclassing spell slot calculation, just like the Paladin or Ranger, meaning their levels are divided by two (rounded down).

Does this calculator determine what level spells I can know or prepare?

No. The maximum level of spells you can prepare or know is determined separately by the levels in your individual spellcasting classes. This calculator only determines the total number of slots you have to cast them.

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