PEN, PAPER & PIXEL
Spellcaster Resilience • 5e & 2024 Rules

D&D 5e Concentration DC & Save Calculator

Determine the exact Constitution save DC required when taking damage, calculate your mathematical pass probability with War Caster, and test live rolls.

DC is 10 or half damage (whichever is higher)
Con Mod + Proficiency (if proficient via Sorcerer / Resilient)
Aura of Protection (+CHA) or Ring of Protection
Concentration DC
12
Half of 24 damage = 12
Pass Probability
91%
With War Caster Advantage
Min Roll Needed on d20
7
On d20 before advantage
Live Test Roll
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Click roll button below

Concentration Rules in D&D 5e

Maintaining concentration is critical for powerful battle-altering spells like Haste, Hold Person, Spirit Guardians, and Banishment. Losing concentration on Haste causes your ally to lose an entire turn to lethargy.

Damage Taken Concentration DC Formula Used Typical Source
1 to 21 Damage DC 10 Minimum threshold applies (10 > damage/2) Standard weapon strike, cantrip, minor poison.
30 Damage DC 15 Half damage (30 / 2 = 15) Fireball spell, giant club swing.
50 Damage DC 25 Half damage (50 / 2 = 25) Dragon breath weapon, disintegrate hit.
Incapacitated / Killed Automatic Failure Spell ends instantly with no save Dropping to 0 HP, Stunned, Paralyzed, Unconscious.

Related Tabletop Calculators

Spell Save DC & Attack Calculator Calculate your own spellcasting DC and enemy save failure odds. 5e Hit Point (HP) Calculator Calculate total HP pool to see how much damage you can absorb. 5e Death Saves Simulator Check survival probability if massive damage drops you to 0 HP. 5e Cover Rules & AC Calculator Use half and three-quarters cover to avoid getting hit in combat.