Fireball Damage Calculator

Roll blazing 8d6 fire damage, upcast the spell, and track Dexterity save half damage for every creature in the blast.

Spell Settings

Damage Results

Press Roll Fireball to see blazing damage.

Recent Fireballs

Look back at your last six casts with dice totals and how many creatures saved.

No history yet.

How to Use the Fireball Damage Calculator

  1. Pick the spell slot in the Base Damage Dice dropdown. Fireball starts at 8d6 and gains +1d6 per slot above 3rd level.
  2. Enter your spell save DC and add targets. For each enemy, type a name and their Dexterity modifier.
  3. Click Roll Fireball or tap space to roll every d6 instantly. The calculator displays each die, the total damage, and the results for every target.
  4. The tool compares each target’s Dexterity saving throw (d20 + modifier) against your DC, then shows full or half damage automatically.
  5. Review your recent blasts in the history panel for quick reference when the party unleashes multiple fireballs per encounter.

Features for Blasting Wizards and Sorcerers

  • Upcasting Support: Instantly scale to higher spell slots up to 9th level without manual math.
  • Per-Target Saves: Track Dexterity modifiers and saving throws for every creature, including advantages or penalties.
  • Half Damage Automation: Creatures that succeed automatically take half damage, rounded down, per D&D 5e rules.
  • Dice Transparency: Every d6 in the pool appears in the dice display so your group can watch the sparks fly.
  • Persistent History: Save up to six recent fireballs to compare average damage across encounters.

Game Rules for D&D Fireball

Fireball is a 3rd-level evocation spell that explodes in a 20-foot radius sphere and deals 8d6 fire damage on a failed Dexterity saving throw (half on a success). The spell’s damage increases by 1d6 for each slot level above 3rd, making upcast fireballs terrifying at higher tiers of play. The typical save DC equals 8 + proficiency bonus + spellcasting ability modifier. Creatures with Evasion (like rogues and monks) take zero damage on a successful save, so keep an eye on those targets when entering their modifiers.

The average damage of a standard fireball is 28 (or 14 on a successful save). Upcasting to 5th level (10d6) pushes the average to 35. When combined with metamagic like Empowered Spell or Elemental Adept, this calculator helps you evaluate whether to spend sorcery points or other resources before you roll.

Examples and Tactical Tips

Need a reference? A wizard with DC 17 fireball targeting six hobgoblins (Dex +1) inputs each target, rolls once, and instantly knows who failed, who saved, and how many remain standing. Warlocks using Mystic Arcanum can set the base dice to 10d6 for a 5th-level blast, while druids using Wildfire spirit abilities can keep this calculator open to compare area spells. Pair this page with the initiative tracker and attack roller so your turn flows from spell prep to damage application without any rulebook flipping.

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