Dice roller and coin flip
For board games without the dice at hand, role-playing games with unusual dice and decisions between two options.
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Dice
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Coin
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What this tool does
The dice part rolls 1 to 20 dice that all have the same number of sides, from 2 to 1,000, and adds up the total. The coin part flips 1 to 100 coins and counts heads and tails.
The two parts are independent. A roll does not change the coins, and the other way round.
How to use it
- For dice, enter the number of dice and the number of sides. Two dice with 6 sides are preset.
- Select “Roll the dice”. The single dice are shown in the order rolled, with the total above them.
- For coins, enter the number of coins and select “Flip”.
How the result is made
Every die is a random whole number from 1 to the number of sides, drawn on its own. Every coin is a random number that is 0 or 1. The values come from the cryptographic generator of your browser, and values that would favour some faces are thrown away and drawn again.
Each face of a die has the same chance. The total of several dice is a different matter: totals in the middle can be made in more ways than totals at the ends.
| Total | Ways | Chance |
|---|---|---|
| 2 or 12 | 1 each | 2.8% each |
| 3 or 11 | 2 each | 5.6% each |
| 4 or 10 | 3 each | 8.3% each |
| 5 or 9 | 4 each | 11.1% each |
| 6 or 8 | 5 each | 13.9% each |
| 7 | 6 | 16.7% |
Worked example
A game asks for three dice with 8 sides. Enter 3 and 8. A roll may show 5, 8 and 2 with the total 15. The smallest possible total is 3, the largest 24.
Flipping 5 coins gives five heads with a chance of 1 in 32, which is about 3%, because each flip halves the chance.
Common mistakes
- Believing that tails is due after a run of heads. Each flip has a chance of one half, whatever came before.
- Rolling dice with different numbers of sides in one go. The tool rolls equal dice; roll twice for mixed dice.
- Reading the total where the single dice matter, or the other way round. Both are shown.
Frequently asked questions
- Is a die on a screen as fair as a real one?
- In this tool each face has exactly the same chance. The result of a real die also depends on its shape and on how it is thrown.
- Which dice can I roll?
- Any number of sides from 2 to 1,000, including the dice with 4, 8, 10, 12, 20 and 100 sides that many games use.
- Can the coin land on its edge?
- No. The result is always heads or tails.
- Are the results stored or sent anywhere?
- No. They are made by your browser and shown on your screen only.
Last updated: September 28, 2026