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209 votes
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Rolling a D10 (0-9) for hitpoints. What do I get with a zero?

A zero on a d10 counts as 10. This isn't clearly specified in the 5th edition rules, but is clearer in earlier editions of the game, and widely understood among long-time RPG players. However, we can ...
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204 votes
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Does microwaving a die significantly alter its balance?

It doesn't do anything. As a chemist, I had to give this a try. First, I started with a die that had a clear bias toward ~18, according to the saltwater test. The first picture is the initial drop ...
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184 votes

How can I test whether a die is fair?

What kinds of bias can dice have? Lots of kinds, actually. Perhaps the most common accidentally occurring types of bias are: "Shaved" dice, which are not quite symmetrical, but slightly wider or ...
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114 votes
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Is the Saltwater Float represented in this question a good way to test for loaded dice?

OK, so the bounty notice says: The testing listed in this question hasn't actually been conducted by any of those attempting to answer the question, this question requires additional attention to ...
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96 votes

Is there any known limit for how many dice RPG players are comfortable adding up?

So, I am a freelance game designer and I’ve worked on a couple of systems and with a couple of design teams, but I am a “professional” only in the strictest sense (I have been paid for my game design ...
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93 votes
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Player may be manipulating die rolls, but I'm uncertain. How do I approach the situation?

Use a Rolling Tray I don't want to accuse someone of cheating if they were not, but I also don't want cheating to continue if it is in fact occurring Since another player has already mentioned ...
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93 votes
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Why do most people consider a "00" and a "0" on a percentile roll a 100?

In common practice a d100 is effectively a 0-99 roll, with the stipulation that 0 be treated as 100 The game needs a way to roll 1 to 100 with equal chances, and no chance of getting zero. Let's ...
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89 votes
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What dice mechanic gives a bell curve distribution that narrows and increases mean as skill increases?

(SKILL+CONSTANT) dX, keep highest CONSTANT I don't know exactly the behavior you're going for, so there'll be a few arbitrary numbers in my example: skills can be ranked from 0 to 5 dice rolled are ...
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84 votes
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How to approximate rolls for potions of healing using only d6's?

Let's not overcomplicate it: a simple Nd6 + X formula will work just fine. Specifically, the effects of Greater (4d4 + 4) and Superior (8d4 + 8) healing potions are quite closely replicated by ...
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82 votes

How do you play D&D when we don't have dice to play with?

Playing Cards You need a source of randomness, and a deck of playing cards can do it. If you need to roll a d20, shuffle the following 20 cards and draw one: Ace of Hearts (1) 2-10 of Hearts (2-10) ...
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82 votes
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What is the difference between rolling more dice versus fewer dice?

From what I can gather what you're asking, you want to know the probabilistic difference between rolling 10d10 and 5d20. You've rightly pointed out that each roll has the same maximum and that each ...
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79 votes

Rolling a D10 (0-9) for hitpoints. What do I get with a zero?

You are correct. Many old school d10s are marked 0-9 but you count the 0 as 10. If he doesn’t listen to reason, next level use one of the d10s marked 00-90 instead and demand your 45 or so hit ...
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76 votes
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How can I help players learn to tell apart the standard polyhedral dice?

Short answer: really, practice is the only answer It's like any kind of memorization task, eventually you're going to get it, and you'll have trouble until then. But there are ways to make the ...
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  • 7,732
76 votes

Does the chance of rolling a 1 in a pool of d10s increase as the number of dice increases?

Yes it does. Your instinct is right. The more dice, the more likely you are to roll some 1s. If I'm reading you right you're just interested in whether any 1s appear in your rolled pool. It may not ...
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69 votes
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How do I read 2d10 as a percentage?

You read one die as the 10s place and the other die as the 1s place. Traditionally, (00, 0) means 100 instead of 0. Your set is marked to make forgetting which die is which, intentionally or ...
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  • 32.8k
69 votes
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What are the statistical implications of doubling damage on crit instead of doubling the dice rolled?

Given the example of (2d6)×2 (henceforth referred to as 'Doubled Damage') vs (4d6) (referred to as 'Doubled Dice'): When you double the damage rolled instead of doubling the dice rolled, you ...
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68 votes
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What does dice notation like "1d-4" or "1d-2" mean?

GURPS uses 6-side dice for practically everything. It's more economical to refer to them as simply "d" rather than "d6." GURPS uses six-sided dice only […] GURPS uses the "...
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  • 28.3k
67 votes
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Dice Rolling Method Fairness

This is a classic clustering fallacy Wikipedia defines the clustering fallacy as: ...the tendency to erroneously consider the inevitable "streaks" or "clusters" arising in small samples from ...
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66 votes
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Is it possible to emulate common polyhedral dice rolls using just a d6, and if so, how?

It's pretty trivial if you allow occasional discarding of rolls/rerolls. d2 (gonna need this later): if result is odd, read as a 1. If result is even, read as a 0. d4: discard any results of 5 or 6.* ...
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  • 98.6k
64 votes

Can I randomly determine the outcome of an event with 5 outcomes with a d6?

You have it -- roll the D6, if you roll a 6, roll again. You'll get a flat probability curve. Alternatively, you could roll a D10 or D20, and integer divide the result by 2 or 4 respectively (that ...
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  • 15.6k
64 votes

How to let my players fail their rolls intentionally, but covertly?

You might want to take some inspiration from the game Paranoia.* In particular, instead of trying to avoid hidden notes, make note-passing between the GM and players a common and ubiquitous mechanic ...
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63 votes

Player may be manipulating die rolls, but I'm uncertain. How do I approach the situation?

Talk to your players Seriously. This is the very first step. Do not accuse anyone, just talk. There may be many reasons for cheating on dice: Failed roll ruined otherwise good plan that had 90% ...
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  • 20k
60 votes

Simulating these special dice on more regular dice

Look at the pips a certain way Tell your kids that the pips on the dice represent where you hit. A pip in the center means that you hit on-target, a pip on the sides means that you missed. As special ...
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  • 1,525
60 votes
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Help me identify these 20-sided dice with assorted numbers from 4 to 72

I went and Googled for the numbers, and the first (and currently only) result was US patent 7815191B2 titled "Equals: the game of strategy for the basic facts". The abstract reads: "...
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58 votes

How do you play D&D when we don't have dice to play with?

I assume you can get your hands on a small bag and a bunch of identical beads. Take 20 beads and write the numbers from 1 to 20 on them. Put them in the bag and (optionally) write "d20" on it. To ...
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58 votes

Can I randomly determine the outcome of an event with 5 outcomes with a d6?

Yes, this works: in statistics, it's known as rejection sampling. The very slight problem is that you could roll a large number of consecutive sixes so you can't guarantee that the procedure will ...
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56 votes
Accepted

Is there a name for this 20 sided die with two 1s, two 2s, etc?

Gamescience, a dice manufacturer, calls such a die simply a d20 0–9 Twice. Yours appears to be this one, and, as of this writing, it appears you can buy more. However, you may not need to. The owner ...
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56 votes

Can a Circle of the Stars Druid roll a natural d3 (or other odd-sided die) to bias their Cosmic Omen roll?

The rules assume you only have a standard polyhedral set. It seems abundantly clear to me that the intent is for the die to have an even numbers of sides. The feature’s outcomes are based on odd or ...
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52 votes
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Natural 20 when rolling with disadvantage

The rule on modifiers applies only after you've determined a base roll. And to do that you must first resolve disadvantage (PHB page 173): Use the higher of the two rolls if you have advantage, and ...
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