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* Trying to make a [[Ranged Attack|ranged attack]] against an enemy that is within 5ft and making you [[Threatened (Condition)|Threatened]]. | * Trying to make a [[Ranged Attack|ranged attack]] against an enemy that is within 5ft and making you [[Threatened (Condition)|Threatened]]. | ||
*Various spells and abilities that grant Disadvantage. | *Various spells and abilities that grant Disadvantage. | ||
==Math== | |||
The benefits of rolling with advantage (or the detriments of rolling with disadvantage) change depending on the target number you need on the 1d20 roll to succeed. The bonus from advantage can be as large as 24-25% when needing a 9, 10, 11, 12, or 13 on the 1d20 roll, and as small as 9% if one needs to roll a 19. | |||
{| class="wikitable mw-collapsible <!--mw-collapsed-->" | |||
|+ Chance of rolling a target number or above on 1d20 | |||
|- | |||
! Target on 1d20 !! Normal Roll !! Roll With Advantage !! Roll With Disadvantage | |||
|- | |||
| 1 || 100% || 100% || 100% | |||
|- | |||
| 2 || 95% || 99.75% || 90.25% | |||
|- | |||
| 3 || 90% || 99% || 81% | |||
|- | |||
| 4 || 85% || 97.75% || 72.25% | |||
|- | |||
| 5 || 80% || 96% || 64% | |||
|- | |||
| 6 || 75% || 93.75% || 56.25% | |||
|- | |||
| 7 || 70% || 91% || 49% | |||
|- | |||
| 8 || 65% || 87.75 || 42.25 | |||
|- | |||
| 9 || 60% || 84% || 42.25% | |||
|- | |||
| 10 || 55% || 79.75 || 30.25 | |||
|- | |||
| 11 || 50% || 75% || 25% | |||
|- | |||
| 12 || 45% || 69.75% || 20.25% | |||
|- | |||
| 13 || 40% || 64% || 16% | |||
|- | |||
| 14 || 35% || 57.75% || 12.25% | |||
|- | |||
| 15 || 30% || 51% || 9% | |||
|- | |||
| 16 || 25% || 43.75% || 6.25% | |||
|- | |||
| 17 || 20% || 36% || 4% | |||
|- | |||
| 18 || 15% || 27.75% || 2.25% | |||
|- | |||
| 19 || 10% || 19% || 1% | |||
|- | |||
| 20 || 5% || 9.75% || 0.25% | |||
|} | |||
==External Links== | ==External Links== | ||
*[https://www.youtube.com/watch?v=X_DdGRjtwAo The unexpected logic behind rolling multiple dice and picking the highest] by Matt Parker | *[https://www.youtube.com/watch?v=X_DdGRjtwAo The unexpected logic behind rolling multiple dice and picking the highest] by Matt Parker | ||
*[http://onlinedungeonmaster.com/2012/05/24/advantage-and-disadvantage-in-dd-next-the-math/ Advantage and Disadvantage in D&D Next: The Math] by The Online Dungeon Master (Michael Iachini) | |||
*[https://statmodeling.stat.columbia.edu/2014/07/12/dnd-5e-advantage-disadvantage-probability/ D&D 5e: Probabilities for Advantage and Disadvantage] by Bob Carpenter | |||
{{NavGameplay}} | {{NavGameplay}} | ||
[[Category:Gameplay mechanics]] | [[Category:Gameplay mechanics]] | ||