Compare1d8+5 @ AC15 +9 attacks 2 vs 1d8+15 @ AC15 +4 attacks 2

1d8+5 @ AC15 +9 attacks 2 vs 1d8+15 @ AC15 +4 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 1 8-sided die, plus 5. On a crit, double the damage dice (the 1d8+5 becomes 2d8+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 1 8-sided die, plus 5. On a crit, double the damage dice (the 1d8+5 becomes 2d8+5); flat modifiers stay the same.

min 0 max 42 mean 14.70 147/10 ±6.80
P(finish at 17 HP) = 45.08%
  • 0 6.25%
  • 1 0.00%
  • 2 0.00%
  • 3 0.00%
  • 4 0.00%
  • 5 0.00%
  • 6 4.38%
  • 7 4.41%
  • 8 4.45%
  • 9 4.49%
  • 10 4.53%
  • 11 4.57%
  • 12 5.38%
  • 13 6.19%
  • 14 2.65%
  • 15 3.42%
  • 16 4.20%
  • 17 5.00%
  • 18 5.80%
  • 19 6.63%
  • 20 5.93%
  • 21 5.21%
  • 22 4.47%
  • 23 3.73%
  • 24 2.97%
  • 25 2.18%
  • 26 1.36%
  • 27 0.51%
  • 28 0.40%
  • 29 0.31%
  • 30 0.22%
  • 31 0.15%
  • 32 0.10%
  • 33 0.05%
  • 34 0.02%
  • 35 0.01%
  • 36 0.01%
  • 37 0.00%
  • 38 0.00%
  • 39 0.00%
  • 40 0.00%
  • 41 0.00%
  • 42 0.00%
  • 43 0.00%
  • 44 0.00%
  • 45 0.00%
  • 46 0.00%
  • 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%
  • 59 0.00%
  • 60 0.00%
  • 61 0.00%
  • 62 0.00%
Strike B

Roll 1 twenty-sided die. Add +4. 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 11). A natural 20 always crits, regardless of AC. On a hit, deal 1 8-sided die, plus 15. On a crit, double the damage dice (the 1d8+15 becomes 2d8+15); flat modifiers stay the same., plus Roll 1 twenty-sided die. Add +4. 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 11). A natural 20 always crits, regardless of AC. On a hit, deal 1 8-sided die, plus 15. On a crit, double the damage dice (the 1d8+15 becomes 2d8+15); flat modifiers stay the same.

min 0 max 62 mean 19.95 399/20 ±14.37
P(finish at 17 HP) = 69.38% (111/160)
  • 0 25.00%
  • 1 0.00%
  • 2 0.00%
  • 3 0.00%
  • 4 0.00%
  • 5 0.00%
  • 6 0.00%
  • 7 0.00%
  • 8 0.00%
  • 9 0.00%
  • 10 0.00%
  • 11 0.00%
  • 12 0.00%
  • 13 0.00%
  • 14 0.00%
  • 15 0.00%
  • 16 5.63%
  • 17 5.70%
  • 18 5.78%
  • 19 5.86%
  • 20 5.94%
  • 21 6.02%
  • 22 6.09%
  • 23 6.17%
  • 24 0.63%
  • 25 0.55%
  • 26 0.47%
  • 27 0.39%
  • 28 0.31%
  • 29 0.23%
  • 30 0.16%
  • 31 0.08%
  • 32 0.32%
  • 33 0.64%
  • 34 0.98%
  • 35 1.32%
  • 36 1.67%
  • 37 2.03%
  • 38 2.40%
  • 39 2.78%
  • 40 2.54%
  • 41 2.27%
  • 42 2.00%
  • 43 1.70%
  • 44 1.39%
  • 45 1.05%
  • 46 0.70%
  • 47 0.34%
  • 48 0.27%
  • 49 0.21%
  • 50 0.15%
  • 51 0.11%
  • 52 0.07%
  • 53 0.04%
  • 54 0.02%
  • 55 0.01%
  • 56 0.01%
  • 57 0.00%
  • 58 0.00%
  • 59 0.00%
  • 60 0.00%
  • 61 0.00%
  • 62 0.00%

B finishes in 1.43 strikes vs A's 1.66 — B wins by 0.22 strikes.

Strikes to kill 17 HP expected: 1.66
  • ≤ 1 45.08%
  • ≤ 2 90.59%
  • ≤ 3 98.85%
  • ≤ 4 99.88%
Strikes to kill 17 HP expected: 1.43
  • ≤ 1 69.38%
  • ≤ 2 90.94%
  • ≤ 3 97.38%
  • ≤ 4 99.26%
  • ≤ 5 99.79%