Dice roller
Type dice notation such as 2d6+3, or tap a die, and press Roll. Kept and dropped dice are shown, with the total.
Free · no signup Runs in your browser
How do I roll dice online?
Type the roll in dice notation, such as 1d20 for one twenty-sided die, 2d6+3 for two six-sided dice plus 3, or 4d6dl1 for four six-sided dice dropping the lowest, then press Roll. The tool rolls each die separately, shows every result and adds them up. Every face is equally likely, because the rolls use the browser's secure random generator with no modulo bias.
Dice notation in one minute
Dice notation is a short way to write a roll: the number of dice, the letter d, then the number of sides. So 3d8 means three eight-sided dice added together. A plus or minus afterwards is a modifier added to the total, as in 1d20+5. Some games add rules to keep or drop dice: kh keeps the highest, kl keeps the lowest, dh drops the highest and dl drops the lowest, followed by how many. In Dungeons & Dragons fifth edition, advantage is 2d20kh1, disadvantage is 2d20kl1, and the usual ability-score method is 4d6dl1.
The tool accepts up to 100 dice with 2 to 1,000 sides. Dice that are dropped are shown struck through, so you can see what was ignored.
It runs in your browser. Nothing is sent anywhere, and there is no sign-up.
What to expect from a roll
The total of several dice clusters around the middle. Two six-sided dice give 7 more often than any other total (six ways out of 36), and 2 or 12 only once in 36 each. A single die is flat: each face has the same chance, and a 20 on a d20 is no rarer than a 7. Streaks of the same number happen in a fair die more often than most people expect. The tool shows the possible range for plain rolls so you can see the extremes.
When to use it
- Tabletop role-playing games and board games
- Settling a tie or deciding who goes first
- Teaching probability with real rolls
- Rolling when you do not have dice to hand
Mistakes it helps you avoid
- Reading 2d6 as a single roll from 2 to 12 with equal odds: the middle totals are likelier.
- Forgetting which dice are dropped in a keep or drop roll.
- Using Math.random-style rolls that are not fair.
- Re-rolling until you like the result.
The formula
How the answer is worked out.
1. Read the notation: number of dice, sides, optional keep or drop, optional modifier.2. For each die take an unbiased random integer from 1 to the number of sides.3. If keep or drop is given, set aside the highest or lowest dice as asked.4. total = sum of the kept dice + modifier
A fair n-sided die gives each face a 1 in n chance. For two or more dice the chance of a total is the number of ways to make it divided by sides to the power of the number of dice. Ties for the lowest or highest die are broken by position, which does not change the total.
Example: 4d6 drop lowest
You roll an ability score with 4d6dl1 and get 5, 3, 6 and 2.
- Dice5, 3, 6, 2
- Drop the lowest2 is dropped
- Add the rest5 + 3 + 6 = 14
Total 14
Your rolls will differ each time.
Terms on this page
- Dice notation
- A short form such as 2d6+3 for 'roll two six-sided dice and add 3'.
- Advantage
- In some games, rolling twice and keeping the better result.
Common questions
What does 2d6+3 mean?
Roll two six-sided dice, add them and add 3.
What is advantage on a d20?
Roll two d20s and keep the higher: 2d20kh1.
Are the rolls fair?
Yes. Each face has the same chance, using the browser's secure random generator.
How many dice can I roll?
Up to 100 dice with up to 1,000 sides.
What is the most likely total of 2d6?
7, which comes up 6 times in 36.
Is anything I enter sent to a server?
No. The calculation happens in your browser and nothing you type leaves your device.
What to work out next
Where these numbers come from
- Wikipedia — Dice notation What 2d6+3 and 4d6 drop lowest mean.
- MDN Web Docs — Crypto.getRandomValues() The browser's cryptographically strong random number source used by these tools.
- Wikipedia — Dice Dice shapes and the standard polyhedral set.
Last verified 2026-10-25 The method on this page is checked against the sources above at least once a year. Spotted something out of date? Tell us and we will fix it.
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