Dice Roller
This dice roller throws virtual dice from a d4 to a d20, as many as you like, with a modifier when you need one. Pick the die, set the count, and tap roll to see each face, the total, and your roll history. Every die draws from your browser's cryptographic random source, so it's a fair throw with no pattern. It's free, private, and runs on your device, so it's perfect for board games, tabletop campaigns, or a probability lesson.
- d4 to d100
- Roll several
- Add a modifier
- Each die plus total
- Roll history
Last updated June 17, 2026 Fair, even faces Reviewed by the Calcowa team
How does a dice roller work?
A die roll is just a fair pick from 1 up to the number of faces, so a d6 picks from 1 to 6 and a d20 from 1 to 20. This tool asks your browser's cryptographic random source for a value and maps it evenly onto those faces, with no lean toward any number. Roll several dice and it repeats the pick for each, shows you every face, adds them up, and applies your modifier to the total. Each die is independent, so one result never sways the next. As notation, 3d6+2 means three six-sided dice plus two, and that's exactly what the count, die, and modifier fields build here. You don't need real dice on hand, and you won't lose one under the couch, so it's ready whenever a game calls for a roll.
Rolling dice, step by step
Here's the quick routine for any game:
- 1
Pick the dieTap d6 for board games, or d20 for tabletop.
- 2
Set the countChoose how many dice you're rolling at once.
- 3
Add a modifierSet a plus or minus if your game's rule calls for it.
- 4
Roll and readYou'll see each die, the total, and your history.
The standard dice
The polyhedral dice and the average of a single roll of each.
| Die | Faces | Range | Average |
|---|---|---|---|
| d4 | 4 | 1 to 4 | 2.5 |
| d6 | 6 | 1 to 6 | 3.5 |
| d8 | 8 | 1 to 8 | 4.5 |
| d12 | 12 | 1 to 12 | 6.5 |
| d20 | 20 | 1 to 20 | 10.5 |
Frequently asked questions
You pick a die type, say how many to roll, and add a modifier if you want one, then tap roll. Each die draws from your browser's cryptographic random source, so every face has an even chance and there's no pattern. The tool shows each die, adds them up, applies your modifier, and keeps a history of recent rolls. It all runs on your device, so you'll get a fresh, fair result the moment you tap.
All the standard polyhedral dice: d4, d6, d8, d10, d12, d20, and d100. The d6 is the classic cube you know from board games, and the rest are the ones tabletop games like Dungeons and Dragons use. You can roll several of the same die at once, like 3d6 for damage or stats, and the roller sums them and adds any modifier you set, so it fits both board nights and role-playing.
Yes, they use the browser's crypto random generator, which is built for unpredictability and is far stronger than the basic random function many scripts rely on. Each face is equally likely, and every roll is independent of the last, so a string of high rolls doesn't change what comes next. For games, stats, or any fair draw, it's as good as shaking real dice in a cup.
The modifier is a number added to or subtracted from the total after the dice are summed, which is how tabletop rules write a roll like 1d20+5. Set it to +5 and a d20 showing 12 gives a total of 17. Use a negative modifier for a penalty. It only touches the final total, not the individual dice, so you'll still see each face the dice landed on.
That shorthand means the count, the letter d, then the number of sides. So 3d6 is three six-sided dice, and 1d20 is one twenty-sided die. A modifier tacks on at the end, as in 2d8+3, meaning two eight-sided dice plus three. This roller mirrors that notation: set the count, choose the die, and add the modifier, and it shows the same result you'd get rolling real dice.
Yes, it's completely free, with no sign-up and no limit on how many times you roll. It runs entirely in your browser, so it's fast and private, and nothing you do is sent anywhere. Bookmark it for game night, a tabletop campaign, a classroom probability lesson, or any time you're missing a die, and you'll have a fair roll in a tap.
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