Dice roller
Pick a die and roll. Roll one die from 1 to 6, or up to 50 dice at once: d4, d6, d8, d10, d12, d20, d100 or any number of sides. Add a modifier, roll with advantage or disadvantage for D&D 5e, drop the lowest die for ability scores and see your last 10 rolls.
Every face is equally likely. Rolls use your browser’s secure random numbers
- Total
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Press Roll to see the dice.
Totals from 1 to 6, 3.5 on average.
Recent rolls
Your last 10 rolls show up here.
How the dice roller works
Choose a die, how many to roll and an optional modifier, then press Roll. Each die is rolled on its own, so two dice can land on the same number. The total adds up the dice that count plus the modifier, and the line under the dice shows the sum.
The rolls come from your browser’s cryptographically secure random number generator (crypto.getRandomValues), the same source used to make encryption keys. Numbers that would make some faces slightly more likely are thrown away and drawn again, so each face of a d6 comes up 1 time in 6 over the long run. Dice values and totals are never sent to a server, and the dice can’t be set to favor a number.
Dice notation: what 2d6+3 means
Games write rolls as XdY+Z: X is the number of dice, Y the number of sides and Z a modifier added to the total. 2d6+3 means rolling two six-sided dice and adding 3, for a total from 5 to 15. A d6 on its own is one six-sided die, and d% or d100 is a number from 1 to 100.
Dice rolls in D&D 5e
Dungeons & Dragons uses the d4, d6, d8, d10, d12 and d20, plus the d100 for percentile tables. These are the rolls you make most often and how to set them up here.
| Roll | Dice | How it works |
|---|---|---|
| Ability check, attack roll or saving throw | 1d20 + modifier | Meet or beat the target number, such as the Armor Class or the Difficulty Class (DC). |
| Advantage | 2d20, keep the higher | Press Advantage under Common rolls and type your bonus in Modifier. |
| Disadvantage | 2d20, keep the lower | Press Disadvantage under Common rolls. |
| Ability scores | 4d6, drop the lowest | Roll six times and assign the totals to your six abilities. Each total is from 3 to 18. |
| Weapon damage | The weapon’s die + modifier | For example 1d8 for a longsword, 2d6 for a greatsword or 1d12 for a greataxe. |
| Critical hit | The damage dice twice + modifier | A natural 20 on an attack roll. Roll 2d8 instead of 1d8 for a longsword, then add the modifier once. |
| Death saving throw | 1d20 | 10 or higher succeeds. A natural 20 brings you back with 1 hit point, and a natural 1 counts as two failures. |
| Fireball | 8d6 | Fire damage, halved on a successful Dexterity saving throw. |
| Percentile roll | 1d100 | For random tables. Two d10, one for the tens and one for the ones, give the same 1 to 100. |
Rules from the System Reference Document 5.1, published by Wizards of the Coast under a Creative Commons license.
Dice odds and averages
What each die gives on average, and how likely each total is.
On a fair die every face is equally likely, so the chance of any one number is 1 divided by the number of sides, and the average roll is halfway between 1 and the highest face.
| Die | Chance of each number | Average roll |
|---|---|---|
| d4 | 25% | 2.5 |
| d6 | 16.67% | 3.5 |
| d8 | 12.5% | 4.5 |
| d10 | 10% | 5.5 |
| d12 | 8.33% | 6.5 |
| d20 | 5% | 10.5 |
| d100 | 1% | 50.5 |
Odds of each total with two dice
Two dice give 36 equally likely results, but the totals aren’t equally likely: there are six ways to roll 7 and only one way each to roll 2 or 12. That’s why 7 is the most common total in board games played with two dice, such as Monopoly and Catan.
| Total | Ways out of 36 | Chance |
|---|---|---|
| 2 | 1 | 2.78% |
| 3 | 2 | 5.56% |
| 4 | 3 | 8.33% |
| 5 | 4 | 11.11% |
| 6 | 5 | 13.89% |
| 7 | 6 | 16.67% |
| 8 | 5 | 13.89% |
| 9 | 4 | 11.11% |
| 10 | 3 | 8.33% |
| 11 | 2 | 5.56% |
| 12 | 1 | 2.78% |
Advantage raises the average d20 roll from 10.5 to about 13.8, and the chance of a natural 20 from 5% to 9.75%. Disadvantage lowers the average to about 7.2. Rolling 4d6 and dropping the lowest gives an average ability score of about 12.2, against 10.5 for a plain 3d6.
Questions about rolling dice
Is this dice roller really random?
Yes. Each roll uses your browser’s secure random number generator, which can’t be predicted from earlier rolls, and every face is equally likely. Streaks still happen: the same number twice in a row on a d6 comes up 1 time in 6, and over a few dozen rolls some numbers appear more often than others. Dice have no memory, so a number that hasn’t come up for a while isn’t due.
Is it “roll a die” or “roll a dice”?
Die is the singular and dice the plural: you roll a die, or you roll two dice. Many people say “a dice” for one, and dictionaries list that as informal. Either way, the roller above rolls one die or up to 50.
How do I roll a random number from 1 to 6?
Leave the die on d6 and the number of dice at 1, then press Roll 1d6. You get a whole number from 1 to 6, each with a 1 in 6 chance. For another range that starts at 1, such as 1 to 3 or 1 to 50, choose Custom and enter the highest number as the number of sides.
How do I roll with advantage or disadvantage?
Press Advantage under Common rolls. It rolls 2d20 and counts only the higher die; Disadvantage counts only the lower one. Type your bonus in Modifier and it’s added to the die that counts. The faces show both dice, with the one that doesn’t count in gray.
Is this like the Google dice roller?
Searching Google for “roll a die” shows a small dice roller in the results. This one rolls the same standard dice and adds the d100, dice with any number of sides from 2 to 1,000, dropping the lowest or highest die, a list of your last 10 rolls and a full screen mode. Bookmark it to roll without searching.
Can I use it in a classroom or for board games?
Yes. Press Full screen to show only the dice, the total and the Roll button, in large type for a projector or a tablet on the table. Board games mostly use one or two d6, and the 2d6 button under Common rolls sets that up in one tap. Some phones, including iPhones, don’t let web pages go full screen, so the button doesn’t appear there.