Determine the total number of spell slots your character possesses based on their class levels and multiclassing rules. This calculator uses the standard Dungeons & Dragons 5th Edition ruleset.
Spell Slot Calculator
Detailed steps will appear here after calculation.
Spell Slot Calculator Formula
Effective Caster Level (ECL) is calculated by summing class contributions:
$$ \text{ECL} = \text{L}_{\text{Full}} + \lfloor \frac{\text{L}_{\text{Half}}}{2} \rfloor + \lfloor \frac{\text{L}_{\text{Third}}}{3} \rfloor $$
Where:
$L_{\text{Full}}$ = Level in a Full Caster Class (e.g., Wizard, Cleric)
$L_{\text{Half}}$ = Level in a Half Caster Class (e.g., Paladin, Ranger)
$L_{\text{Third}}$ = Level in a Third Caster Class (e.g., Eldritch Knight, Arcane Trickster)
The Spell Slots are then determined by the official D\&D 5e Multiclassing Spell Slot Table, based on the resulting ECL.
Variables Explained
- Full Caster Level: The total levels you have in classes that progress spellcasting at every level (e.g., Bard, Cleric, Druid, Sorcerer, Wizard).
- Half Caster Level: The total levels you have in classes that progress spellcasting at half their level (e.g., Paladin, Ranger).
- Third Caster Level: The total levels you have in classes that progress spellcasting at one-third their level (e.g., Eldritch Knight Fighter, Arcane Trickster Rogue).
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What is the Spell Slot Calculator?
The Spell Slot Calculator is a crucial tool for players engaging in the popular tabletop role-playing game Dungeons & Dragons, particularly when utilizing the advanced “multiclassing” rule. In D&D 5th Edition, your ability to cast spells is determined by an overall measure called your Effective Caster Level (ECL), which is derived from the combination of different spellcasting classes you possess.
This tool simplifies the process of determining your total available spell slots across all levels (1st through 9th). Manually calculating the ECL—which involves summing your full caster levels, half of your half-caster levels, and one-third of your third-caster levels (all rounded down)—can be confusing and error-prone. The calculator instantly provides the correct ECL and the resulting spell slot matrix, ensuring you always know exactly how many times you can cast spells of each level during your adventures.
How to Calculate Effective Caster Level (Example)
Follow these steps to understand how the calculator arrives at the final Effective Caster Level:
- Identify Class Levels: Assume a character is a level 5 Wizard (Full Caster) and a level 4 Ranger (Half Caster).
- Calculate Full Caster Contribution: The Wizard level (5) contributes 5 fully to the ECL.
- Calculate Half Caster Contribution: The Ranger level (4) is divided by 2: $4 / 2 = 2$. This contributes 2 to the ECL.
- Calculate Third Caster Contribution: Assume the character has 0 levels in a Third Caster class, contributing 0.
- Sum the Contributions: Add the calculated levels: $5 (\text{Full}) + 2 (\text{Half}) + 0 (\text{Third}) = 7$.
- Final Result: The Effective Caster Level is 7. You would then use the Spell Slot Table corresponding to level 7 to determine the available slots (4x1st, 3x2nd, 3x3rd, 1x4th).
Frequently Asked Questions (FAQ)
- Is the Spell Slot Calculator accurate for Warlocks?
Warlocks use a unique Pact Magic system that does not combine with the standard Spellcasting feature. You should calculate Warlock spell slots separately, as they do not contribute to your Effective Caster Level for other classes. - What happens if I have an odd level in a Half Caster class?
The contribution is always rounded down. For instance, a level 3 Paladin (Half Caster) contributes $\lfloor 3 / 2 \rfloor = 1$ level to the Effective Caster Level. - Do all levels count towards my total character level?
Yes, all class levels contribute to your total character level, but only spellcasting classes (and their type: Full, Half, Third) contribute to your Effective Caster Level for spell slots. - What are the maximum spell slots I can gain?
The maximum Effective Caster Level is 20, which grants the maximum standard spell slots: 4x1st, 3x2nd, 3x3rd, 3x4th, 2x5th, 2x6th, 1x7th, 1x8th, 1x9th.