Dice Probability Calculator

v1.0.0

Common dice probabilities — d4 / d6 / d20, sum distributions, advantage / disadvantage.

Dice Type

Number of dice

Modifier

Roll Mode

Result

d20 × 1  [normal]

Minimum:  1
Maximum:  20
Average:  10.5

Each face probability: 5.0%

d20 quick reference:
  Nat 20 (crit): 5.0%
  Nat 1 (fumble): 5.0%
  Roll ≥ 15: 30.0%
  Roll ≥ 10: 55.0%