DnD Multiclass Spell Slot Calculator
Calculate 5e multiclass spell slots from a 2–3 class build, including effective caster level, normal spell slots, and separate warlock pact slots.
Last updated: 2026-03-27
DnD multiclass spell slot calculator
Enter your values
Paste a 2–3 class build string and get the combined slot ladder without doing the caster-level math by hand.
Combined Slot Ladder
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Enter a build like `wizard 5 / paladin 2` to see the multiclass spell-slot ladder and any separate pact slots.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Wizard / paladin splash
Full caster base with a small martial dip
A classic multiclass case where the combined slot ladder is stronger than the second class looks on paper.
Result: Third-level slots appear, but the build is still mainly using them to cast wizard spells or upcast paladin magic
Cleric / ranger mix
Half-caster contribution slows the total
Useful when checking a build that feels like it should have advanced farther but only adds part of the martial-caster progression.
Result: The slot ladder advances, but slower than a pure full caster at the same total level
Sorlock check
Long-rest slots plus Pact Magic
Warlock levels do not expand the normal multiclass slot table directly, so the pact-slot row needs to stay separate.
Result: A hybrid build can carry a normal slot ladder and still add short-rest pact casts on top
How the multiclass slot calculator works
The calculator turns a build string into class segments, then computes an effective multiclass caster level using the normal 5e full-, half-, and third-caster rules. That effective level is what drives the long-rest spell-slot ladder.
Warlocks are intentionally separated out because Pact Magic is not part of the same engine. That distinction matters most in hybrid builds where short-rest pact slots create more total daily casts without changing the standard multiclass spellcaster table.
Multiclass spell slot FAQs
How the 5e multiclass table, pact slots, and upcast-only slots fit together.
Does this follow the normal 5e multiclass spellcaster table?
Yes. The combined long-rest slot ladder uses the standard 2014 5e multiclass spellcaster progression. Full casters add fully, half casters add half their level rounded down, and third casters add one third rounded down.
Why is warlock shown separately?
Because Pact Magic does not merge into the normal spell-slot table. Warlock levels grant their own short-rest slots, so the cleanest and most rules-faithful way to show the build is to keep pact slots separate.
Why do I have a higher slot than the spells I know?
That is a normal multiclass outcome. Your combined slot ladder can be higher than the level of spells any one class in the build can actually learn or prepare, which usually means those higher slots are mainly for upcasting.
Which fighter and rogue builds count as third casters?
Only Eldritch Knight and Arcane Trickster-style progressions. The calculator expects those names explicitly rather than treating every fighter or rogue level as spellcasting.
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