Dice roller
Nothing yet. Results appear here so you can prove what came up.
Dice notation writes a roll as a number of dice, the letter d, and the number of faces: 2d6 is two six-sided dice, d20 is one twenty-sided die. A modifier can be added, as in 3d8+2, and groups combined, as in 4d6-1+d4. Each die is rolled independently, up to two hundred at a time, and the total is the sum.
How to roll
Rolling several dice is not the same as rolling one bigger one. A d12 gives every value from 1 to 12 equally often; 2d6 covers the same width shifted to 2 through 12, but 7 turns up six times as often as 2. That hump in the middle is exactly what board games want, and it is why they so rarely hand you a single die with a large number of faces.
The d20 is the opposite case, and it is used precisely because it is flat: every result from 1 to 20 is a straight one in twenty, so a +5 modifier slides the whole distribution along without reshaping it. Advantage bends that flatness. Taking the higher of two d20s is worth roughly five points in the middle of the range and much less at either end, which is why it counts for most against a middling target number and for very little against one you were always going to hit.
What people use it for
- Rolling a d20 for a tabletop session, with advantage or a flat modifier
- Rolling 4d6 for character stats and dropping the lowest by eye
- Replacing a lost die in a board game
- Settling something with 2d6 when there is no die in the house
Questions
The standard form: an optional count, d, the number of faces, and optional plus or minus terms. d20, 2d6, 3d8+2 and 4d6-1+d4 all work.
One in twenty, five percent, on every roll. Previous rolls have no effect on the next one.
Put it in the notation: 1d20+5 rolls the die and adds five to the total. A minus works the same way.
Enter 2d20 and read the larger of the two dice. Both are listed separately, so ignore the total; the advantage result is the higher number on its own.
Yes. d3, d7 and d100 are all fine, up to two hundred dice at once.
Yes. Every die is drawn separately from the browser’s cryptographic generator, so 4d6 is four honest rolls and not one number carved into pieces.
Usually. The draw is rejection sampled over a cryptographic source, so no face is favoured, which is more than most moulded plastic dice manage.
Not automatically. Every die is shown separately, so for 4d6 drop lowest you read the four numbers and ignore the smallest.
Seven. Any number of fair dice averages the count times the midpoint of a single die, so 3d6 averages 10.5.
Because a natural maximum matters in most systems that use dice, and picking it out of a row of numbers is the thing you would otherwise do by eye.
Enter a seed. The same seed rolls the same sequence, so a result can be checked after the fact rather than argued about.
Only in this tab, and only until you leave. Nothing about your rolls is sent anywhere.