Compare2d6+5 @ AC15 +9 attacks 2 vs 2d6r1+5 @ AC15 +9 attacks 2

2d6+5 @ AC15 +9 attacks 2 vs 2d6r1+5 @ AC15 +9 attacks 2

Side-by-side distributions with exact probabilities. Edit either expression or drag the HP slider — the URL updates as you go, so the page stays shareable. expression syntax →

Strike A

Roll 1 twenty-sided die. Add +9. Compared against AC 15: you hit if the kept d20 face plus the bonus totals 15 or more (so the d20 needs to land on at least 6). A natural 20 always crits, regardless of AC. On a hit, deal 2 6-sided dice, plus 5. On a crit, double the damage dice (the 2d6+5 becomes 4d6+5); flat modifiers stay the same., plus Roll 1 twenty-sided die. Add +9. Compared against AC 15: you hit if the kept d20 face plus the bonus totals 15 or more (so the d20 needs to land on at least 6). A natural 20 always crits, regardless of AC. On a hit, deal 2 6-sided dice, plus 5. On a crit, double the damage dice (the 2d6+5 becomes 4d6+5); flat modifiers stay the same.

min 0 max 58 mean 18.70 187/10 ±8.50
P(finish at 19 HP) = 54.99%
  • 0 6.25%
  • 1 0.00%
  • 2 0.00%
  • 3 0.00%
  • 4 0.00%
  • 5 0.00%
  • 6 0.00%
  • 7 0.97%
  • 8 1.94%
  • 9 2.92%
  • 10 3.90%
  • 11 4.88%
  • 12 5.87%
  • 13 4.93%
  • 14 4.03%
  • 15 3.22%
  • 16 2.52%
  • 17 1.97%
  • 18 1.60%
  • 19 2.41%
  • 20 3.31%
  • 21 4.21%
  • 22 5.00%
  • 23 5.56%
  • 24 5.80%
  • 25 5.61%
  • 26 5.10%
  • 27 4.38%
  • 28 3.55%
  • 29 2.71%
  • 30 1.96%
  • 31 1.41%
  • 32 1.02%
  • 33 0.75%
  • 34 0.57%
  • 35 0.45%
  • 36 0.36%
  • 37 0.27%
  • 38 0.19%
  • 39 0.13%
  • 40 0.09%
  • 41 0.05%
  • 42 0.03%
  • 43 0.02%
  • 44 0.01%
  • 45 0.01%
  • 46 0.01%
  • 47 0.00%
  • 48 0.00%
  • 49 0.00%
  • 50 0.00%
  • 51 0.00%
  • 52 0.00%
  • 53 0.00%
  • 54 0.00%
  • 55 0.00%
  • 56 0.00%
  • 57 0.00%
  • 58 0.00%
Strike B

Roll 1 twenty-sided die. Add +9. Compared against AC 15: you hit if the kept d20 face plus the bonus totals 15 or more (so the d20 needs to land on at least 6). A natural 20 always crits, regardless of AC. On a hit, deal 2 6-sided dice (reroll any 1 once), plus 5. On a crit, double the damage dice (the 2d6r1+5 becomes 4d6r1+5); flat modifiers stay the same., plus Roll 1 twenty-sided die. Add +9. Compared against AC 15: you hit if the kept d20 face plus the bonus totals 15 or more (so the d20 needs to land on at least 6). A natural 20 always crits, regardless of AC. On a hit, deal 2 6-sided dice (reroll any 1 once), plus 5. On a crit, double the damage dice (the 2d6r1+5 becomes 4d6r1+5); flat modifiers stay the same.

min 0 max 58 mean 20.03 601/30 ±8.92
P(finish at 19 HP) = 57.87%
  • 0 6.25%
  • 1 0.00%
  • 2 0.00%
  • 3 0.00%
  • 4 0.00%
  • 5 0.00%
  • 6 0.00%
  • 7 0.03%
  • 8 0.38%
  • 9 1.70%
  • 10 3.02%
  • 11 4.35%
  • 12 5.67%
  • 13 6.63%
  • 14 5.32%
  • 15 4.03%
  • 16 2.76%
  • 17 1.54%
  • 18 0.44%
  • 19 0.84%
  • 20 1.46%
  • 21 2.36%
  • 22 3.50%
  • 23 4.68%
  • 24 5.70%
  • 25 6.38%
  • 26 6.52%
  • 27 6.04%
  • 28 5.15%
  • 29 4.05%
  • 30 2.94%
  • 31 2.00%
  • 32 1.39%
  • 33 1.03%
  • 34 0.82%
  • 35 0.71%
  • 36 0.62%
  • 37 0.51%
  • 38 0.39%
  • 39 0.28%
  • 40 0.19%
  • 41 0.12%
  • 42 0.07%
  • 43 0.04%
  • 44 0.03%
  • 45 0.02%
  • 46 0.01%
  • 47 0.01%
  • 48 0.01%
  • 49 0.00%
  • 50 0.00%
  • 51 0.00%
  • 52 0.00%
  • 53 0.00%
  • 54 0.00%
  • 55 0.00%
  • 56 0.00%
  • 57 0.00%
  • 58 0.00%

B finishes in 1.48 strikes vs A's 1.52 — B wins by 0.04 strikes.

Strikes to kill 19 HP expected: 1.52
  • ≤ 1 54.99%
  • ≤ 2 94.10%
  • ≤ 3 99.40%
  • ≤ 4 99.95%
Strikes to kill 19 HP expected: 1.48
  • ≤ 1 57.87%
  • ≤ 2 95.05%
  • ≤ 3 99.54%