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by benj1113 hours ago |
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upvoteby sgbeal3 hours ago|
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> but wouldn't you need 101 sides to get 0% and 100% for that?

There is no 0% in d100/d-percentile rolls. Every "how to interpret these dice" paragraph in games which use them will tell you to interpret 0-0 on 2d10 as 100, not 0. Or, hypothetically (but i don't recall having ever seen this), they'll have a stated range of 0 to 99 (inclusive). Either way, the numeric range spans precisely 100 digits.

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upvoteby PunchyHamster2 hours ago|
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yeah but that means there is no 0% on the scale
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upvoteby Karliss1 hours ago|
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The point of percentile dice isn't to generate a string between "0%" and "100%", it is to test if action with chance of x% success gets done or not. For every other value of x, there are x out of 100 values which are strictly less than x, or if you count 0 as 100 then there are x out of 100 values which are less than or equal to x. Either way you get x% percent chance for event to happen. If the dice had 101 sides, the probabilities would be x/101 which aren't nice round percents.

It even works correctly for 0% and 100% chance events. Assuming 0 is counted as 0 - For 0% there are 0 numbers less than 0 on dice so chance of throwing number less that is 0/100=0%. For 100% all 100 numbers are less than 100 so no matter what the result of throw is you will succeed.

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upvoteby PunchyHamster2 hours ago|
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No, because in d100 based systems you success is rolling at or below a chance.

So the fact there is no 0% (0 is interpreted as 100) is necessary because if your modifiers are giving it 0% chance, you need dice to start at 1 for that to work

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