AJT: Alfonso Jermaine

D&D/Pathfinder: How much is +1 worth?

In High-Lights, Other Blogs on December 12, 2015 at 10:51 am

System sans Setting

A friend of mine is looking to play a dual wield fighter (I did try to talk him out of it), and was curious about the tradeoff between attack and damage: i.e., which feats should he take, when should he power attack, etc. So I started thinking about the math.

Basic Premise: In d20, unless you can only miss on a 1, each +1 is an additional 5% of your base effectiveness, per roll.

This is pretty easy to calculate:

  • Each roll has a chance of success based on the number you need to roll on the die to succeed. If you succeed on an 11 or better, that’s half the possible rolls on the die, so you have a 50% chance of success. If you only succeed on a 16 or better, you have a 25% chance of success. And so on.
  • Because there are 20 possible results, each…

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