Roll one or more dice with 4, 6, 8, 10, 12 or 20 sides.
How to use
- Choose how many dice.
- Pick the number of sides.
- Press Roll.
Good to know
Useful for board games and tabletop role-playing. Each die is rolled independently.
How do you roll dice online without owning any?
This free online dice roller rolls up to 20 dice at once, with 4, 6, 8, 10, 12 or 20 sides each. Choose the number of dice and the type of die, press Roll, and the tool shows the value of every die and the total. It works for board games, tabletop role-playing games, classroom probability and any quick random pick.
What does the dice roller do and why is it useful?
Physical dice get lost, roll off tables and are rarely available in the full set of shapes. A digital roller removes those problems. You can roll a single d20 for a skill check, five d6 for a dice game or twenty d4 for a large damage roll, and read each die and the sum without adding anything yourself.
It is useful for:
- Tabletop games that use d4, d6, d8, d10, d12 and d20.
- Board games when the original dice are missing.
- Teaching probability and the idea of a distribution of sums.
- Settling a decision with more than two outcomes.
How does the dice roller work under the hood?
For each die, the tool draws a random value from the browser's cryptographic random source and maps it onto the numbers 1 up to the number of sides. A d6 can show 1 to 6, a d20 can show 1 to 20, and so on. Every face of a die has the same probability, and each die is independent of the others.
After all dice are rolled, the tool lists the value of each die and adds them to show the total. Nothing happens until you press the Roll button, and each press makes a completely new roll. The tool does not remember earlier rolls.
How do you use the dice roller step by step?
- Enter the number of dice, a whole number from 1 to 20.
- Choose the number of sides from the list: d4, d6, d8, d10, d12 or d20.
- Press the Roll button.
- Read the value of each die and the total.
- Press Roll again for a new, independent roll.
What are some worked examples?
Dice results are random, so the tool shows different numbers every time. The examples below give the exact range, average and odds for common settings, all computed in advance.
Example 1: one d20
Input: 1 die, d20. The result is a number from 1 to 20. Each value has a 5 percent chance. The average of a d20 is 10.5.
Example 2: two d6
Input: 2 dice, d6. The total ranges from 2 to 12. There are 36 equally likely combinations. A total of 7 can be made in 6 ways, so it has a probability of 6 / 36 = 16.67 percent. A total of 8 can be made in 5 ways, or 13.89 percent. A total of 2 or 12 can each be made in only 1 way, or 2.78 percent. A possible output is 4 and 3, total 7.
Example 3: three d6
Input: 3 dice, d6. The total ranges from 3 to 18 and averages 10.5. Of the 216 combinations, totals of 10 and 11 each have 27 ways, so each has a probability of 27 / 216 = 12.5 percent. A total of 3 or 18 has only 1 way each.
Example 4: five d10
Input: 5 dice, d10. The total ranges from 5 to 50 and averages 27.5.
Example 5: twenty d4
Input: 20 dice, d4. The total ranges from 20 to 80 and averages 50. The largest rolls are possible but extremely unlikely, because the sums cluster near the middle.
Example 6: a 20 on advantage
Rolling 2 dice, d20, and hoping that at least one shows 20 has a probability of 1 - (19/20) x (19/20) = 9.75 percent, nearly double the 5 percent of a single die.
| Dice | Sides | Range of total | Average total |
|---|---|---|---|
| 1 | 20 | 1 to 20 | 10.5 |
| 2 | 6 | 2 to 12 | 7 |
| 3 | 6 | 3 to 18 | 10.5 |
| 5 | 10 | 5 to 50 | 27.5 |
| 20 | 4 | 20 to 80 | 50 |
Why do sums of several dice bunch around the middle?
A single die is flat: every face is equally likely. Add a second die and the picture changes, because many different pairs produce the same middle total while only one pair produces the lowest or highest. The full set of ways to make each total with two six-sided dice is shown below.
| Total | Ways | Probability |
|---|---|---|
| 2 or 12 | 1 each | 2.78% each |
| 3 or 11 | 2 each | 5.56% each |
| 4 or 10 | 3 each | 8.33% each |
| 5 or 9 | 4 each | 11.11% each |
| 6 or 8 | 5 each | 13.89% each |
| 7 | 6 | 16.67% |
The ways add up to 36, which is 6 x 6. With three, four or more dice the bunching becomes stronger, which is why the range and the average in the earlier table are more informative than the extremes. If you roll 5 dice with 6 sides, there are 7,776 combinations, and the totals near the average of 17.5 occur far more often than a total of 5 or 30.
Another handy figure is the chance of at least one particular face when rolling several dice. With 4 six-sided dice, the chance that at least one shows a 6 is 1 - (5/6)^4, which is 51.77 percent. The tool lets you test this by rolling 4 dice, d6, and checking whether any die shows a 6, although a few rolls will not reproduce the exact percentage.
What tips help you use it well?
- Check the type of die your game asks for before you roll. A d10 and a d12 look alike in a list.
- For multiple separate rolls in a row, press Roll once for each roll and note the result.
- If the rules need a modifier, add it to the total yourself, since the tool shows only the dice and their sum.
- Use the individual values when the rules care about highest or lowest die, not just the sum.
- For simple yes or no decisions, the Coin Flip is quicker.
- For values outside the standard dice, the Random Number Generator lets you choose your own range.
What are common mistakes?
- Expecting sums to be evenly spread. With two or more dice, middle totals are far more common than the extremes.
- Believing a die is due. After several low rolls, the next roll has exactly the same odds as before.
- Choosing the wrong die type. Rolling d8 when the game needs d6 changes the range and average.
- Entering more than 20 dice. The tool accepts 1 to 20.
- Waiting for live updates. Results appear only after you press Roll.
Who uses a dice roller?
Tabletop role-playing groups use it when a player forgets their dice or plays remotely. Families use it as a replacement for a lost board game die. Teachers use it for lessons on probability, averages and distributions. Game designers use it to try ideas quickly. Anyone who needs a random pick from 4, 6, 8, 10, 12 or 20 outcomes can use it too. The Average Calculator is handy for summarising a long list of recorded totals.
Is my data private?
Yes. Rolls are generated entirely in your browser. Nothing is uploaded, your results are not stored, and there is no history. Refreshing the page clears everything.
What are the limitations?
- The tool offers 1 to 20 dice per roll and the six die types listed above.
- All dice in one roll must have the same number of sides.
- There is no modifier field, so add any bonus yourself.
- It does not keep history, offer a copy button or save results.
- Results appear only after you press Roll.
Frequently asked questions
Which dice can I roll?
d4, d6, d8, d10, d12 and d20.
How many dice can I roll at once?
Between 1 and 20, all of the same type.
Are the rolls fair?
Yes. Each face has an equal chance, using the browser's cryptographic random source.
Does the tool show each die?
Yes. It shows the value of every die and the total.
Why is 7 so common with two six-sided dice?
Because six of the 36 combinations add up to 7, more than for any other total.
Can I add a bonus to the total?
There is no bonus field. Add the modifier yourself after reading the total.
Is anything stored or sent anywhere?
No. The roll happens in your browser and nothing is stored or uploaded.
Why does nothing change until I click?
The tool uses a single Roll button, and results update only when you press it.
Roll, read, play
A reliable digital die makes games smoother and probability easier to explore. Pick your dice, press Roll, and discover more free tools for play and everyday tasks.