Spell Attack Bonus Formula:
| From: | To: |
Spell Attack Bonus is a key mechanic in Dungeons & Dragons 5th Edition that determines how likely your spells are to hit their targets. It represents your character's magical accuracy and is used for spell attack rolls against enemy armor class.
The calculator uses the standard D&D 5e spell attack formula:
Where:
Explanation: Your proficiency bonus represents your training and experience with spellcasting, while your ability modifier reflects your natural talent and power in your spellcasting ability.
Details: A higher spell attack bonus increases your chance to hit with attack roll spells like Fire Bolt, Guiding Bolt, or Eldritch Blast. This directly impacts your effectiveness in combat and your ability to overcome enemy defenses.
Tips: Enter your character's proficiency bonus (based on level) and your spellcasting ability modifier. Both values should be whole numbers. The calculator will instantly compute your total spell attack bonus.
Q1: How do I find my proficiency bonus?
A: Proficiency bonus increases with character level: +2 (levels 1-4), +3 (levels 5-8), +4 (levels 9-12), +5 (levels 13-16), +6 (levels 17-20).
Q2: What if I'm multiclassed?
A: Use your total character level to determine proficiency bonus, but use the spellcasting ability modifier from the class whose spells you're casting.
Q3: Does this apply to all spells?
A: No, only spells that require an attack roll. Saving throw spells use your spell save DC instead.
Q4: Can items or feats affect spell attack bonus?
A: Yes, magic items like wands or rods, and feats like Spell Sniper can provide additional bonuses to spell attack rolls.
Q5: What's a good spell attack bonus?
A: At level 1, +5 to +7 is typical. By level 20, expect +11 to +13. Higher is always better for hitting tougher enemies.