How is the proficiency bonus calculated for a multiclass character?

Proficiency bonus depends only on total character level, not on individual class levels. It equals 2 plus the floor of (total level minus 1) divided by 4, so it is plus 2 at levels 1 to 4, plus 3 at 5 to 8, and rises by one every four levels up to plus 6 at level 17.

How does multiclass spellcasting determine spell slots?

You add full caster class levels in full, half of your half-caster levels (Paladin, Ranger) rounded down, and a third of your third-caster levels (Eldritch Knight, Arcane Trickster) rounded down. That sum is your effective caster level, which you look up on the Player's Handbook multiclass slot table.

Why does a Fighter 5 / Wizard 3 not get level-4 wizard slots?

Only the Wizard 3 counts toward caster level for a standard Fighter, giving an effective caster level of 3 and the slots a third-level caster has. The Fighter levels add hit points, attacks, and proficiency but no caster levels unless it is the Eldritch Knight subclass, which counts as a third caster.

How is Warlock handled?

Warlock uses Pact Magic, which does not combine with the normal multiclass slot table. Its slots are tracked separately, are all the same level, and recharge on a short rest. The tool flags this so you do not accidentally merge Pact slots into your regular spell slots.

Does total level cap at 20?

Yes, standard 5e characters cap at level 20, and the multiclass caster level used for slots also caps at 20. If your entered levels sum above 20 the tool warns you and caps the caster level and slot lookup at the level-20 row.

What is the D&D Multiclass Proficiency & Spell Slot Tracker?

Enter each class and level of a D&D 5e multiclass character to compute total level, proficiency bonus, effective multiclass caster level, and the combined spell-slot table from the Player's Handbook rules. It runs free in your browser on Gera Tools, with nothing uploaded.

D&D Multiclass Proficiency & Spell Slot Tracker

Name: D&D Multiclass Proficiency & Spell Slot Tracker
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Multiclassing in D&D 5e tangles two things that are easy to get wrong: your proficiency bonus, which tracks total level, and your spell slots, which follow a special combined caster-level rule. This tracker takes each class and level and returns your total level, proficiency bonus, effective multiclass caster level, and the full combined spell-slot table.

How it works

Proficiency comes from total level, while spell slots come from a weighted caster level fed into the Player’s Handbook multiclass table:

proficiency  = 2 + floor((total level − 1) / 4)
caster level = Σ full-caster levels
             + floor(half-caster levels / 2)
             + floor(third-caster levels / 3)
slots        = PHB multiclass slot table[caster level]

Full casters (Bard, Cleric, Druid, Sorcerer, Wizard) count every level. Paladin and Ranger are half casters, and the Eldritch Knight and Arcane Trickster subclasses are third casters. Warlock is the exception — its Pact Magic stays separate and recharges on a short rest.

Caster category reference

Class / subclass	Caster category	Contribution
Bard, Cleric, Druid, Sorcerer, Wizard	Full caster	Every level counts
Paladin, Ranger	Half caster	floor(levels ÷ 2)
Eldritch Knight (Fighter subclass)	Third caster	floor(levels ÷ 3)
Arcane Trickster (Rogue subclass)	Third caster	floor(levels ÷ 3)
Warlock	Pact Magic (separate)	Does not combine
Barbarian, Fighter, Monk, Rogue	Non-caster	0 contribution

Worked examples

Fighter 5 / Wizard 3 (total level 8):

Proficiency bonus: 2 + floor((8 − 1) / 4) = 2 + 1 = +3
Caster levels: Fighter (non-caster) = 0; Wizard (full) = 3
Effective caster level: 3
Combined spell slots: those of a 3rd-level full caster (4 first-level + 2 second-level)

Eldritch Knight 6 / Wizard 4 (total level 10):

Proficiency bonus: 2 + floor((10 − 1) / 4) = 2 + 2 = +4
Caster levels: EK Fighter 6 (third-caster) = floor(6 ÷ 3) = 2; Wizard 4 (full) = 4
Effective caster level: 6
Combined spell slots: those of a 6th-level caster (4 first, 3 second, 3 third)

Paladin 6 / Warlock 4 (total level 10):

Proficiency bonus: +4
Caster levels: Paladin (half) = floor(6 ÷ 2) = 3; Warlock does not combine
Effective caster level: 3 (Warlock’s 2 Pact slots tracked separately, recharging on short rest)
Combined non-Pact spell slots: those of a 3rd-level caster

Common pitfalls

Forgetting that Paladin and Ranger levels are halved before being added to the caster total — not halved at the end.
Counting Warlock levels in the combined caster total. Warlock Pact Magic is explicitly excluded from the multiclass slot table.
Assuming the multiclass slot table matches a single-class slot progression. It does not — combining a full caster with a half caster gives more slots than either alone at some levels, but fewer than a pure full caster of the same total level.

Always track Warlock Pact slots separately, and the combined caster-level calculation caps at 20.