Custom Dice Roller
Roll standard dice or create your own custom dice with your own sides and values.
Roll History
A custom dice roller is a simple online tool that lets you create and roll dice based on your own settings. Instead of being limited to one standard die, you can choose how many dice you want to roll, how many sides each die has, and, when supported, a modifier to add or subtract from the result.
This can be useful for tabletop RPGs, board games, classroom activities, probability experiments, character creation, random tables, and games that require unusual dice. A digital dice roller can also be helpful when you do not have physical dice nearby.
Our free custom dice roller is designed to provide quick results directly in your browser. Enter your settings, roll the dice, and review the individual results and total. There is no need to calculate every roll by hand.
For games that use dice notation, expressions such as 2d6+3 are commonly used to describe two six-sided dice with a +3 modifier. D&D Beyond also documents rollable dice notation and custom dice functionality in its tools.
What Is a Custom Dice Roller?
A custom dice roller is an online random number tool built around dice. The main difference between a standard dice roller and a custom dice roller is the amount of control you have over the roll.
For example, you may want to roll:
- 1 six-sided die
- 2 six-sided dice
- 4 eight-sided dice
- 3 ten-sided dice
- 1 twenty-sided die
- 2 twenty-sided dice with a modifier
- A custom die with a larger number of sides
Instead of physically throwing dice, the online tool generates a result within the selected range.
A custom dice roller can therefore work as a virtual dice set for situations where physical dice are unavailable or when you need to repeat random rolls quickly.
How Does a Custom Dice Roller Work?
The basic idea is simple. Each die has a range of possible results. A six-sided die, for example, can produce a number from 1 through 6.
When you select multiple dice, the tool generates a separate result for each die and can then calculate the combined total.
For example:
2d6
means:
- Roll two six-sided dice.
- Each die produces a number from 1 to 6.
- Add the two results together.
If the results are 4 and 5:
4 + 5 = 9
A modifier can then be applied.
For example:
2d6 + 3
If the dice produce 4 and 5:
4 + 5 + 3 = 12
This notation is widely used in tabletop role-playing games and other dice-based systems. D&D Beyond’s documentation provides examples of dice expressions such as multiple dice combined with modifiers.
How to Use the Custom Dice Roller
Using an online dice roller does not require complicated math.
| Step | What to Do |
|---|---|
| 1 | Choose the number of dice |
| 2 | Choose the number of sides |
| 3 | Add a modifier if needed |
| 4 | Click the roll button |
| 5 | Review each dice result |
| 6 | Check the final total |
Step 1: Choose the Number of Dice
First, decide how many dice you want to roll.
For example, select 3 dice if your game requires three separate rolls.
Step 2: Choose the Number of Sides
Select the number of sides for your dice.
Common options include:
- d4
- d6
- d8
- d10
- d12
- d20
- d100
A d20 has possible results from 1 to 20, while a d6 has possible results from 1 to 6.
Step 3: Add a Modifier
If your game uses modifiers, enter the appropriate number.
For example:
1d20 + 5
means you roll one twenty-sided die and add 5 to the result.
If the die produces 14:
14 + 5 = 19
Step 4: Roll the Dice
Click the Roll button to generate your result.
The tool should display the individual dice values and, where applicable, the combined total.
Step 5: Read the Result
Look at both the individual rolls and the final total.
This is particularly useful when playing games where the individual dice results matter rather than just the sum.
Custom Dice Roller Example
Suppose you need to roll 3d8+2.
The calculation works like this:
- Roll the first d8 → 6
- Roll the second d8 → 3
- Roll the third d8 → 7
- Add the dice → 6 + 3 + 7 = 16
- Add the modifier → 16 + 2 = 18
So the final result is 18.
The benefit of an online custom dice roller is that it performs these steps instantly.
Common Dice Types
Different games use different dice. Here are some of the most common types:
| Dice | Possible Results | Common Uses |
|---|---|---|
| d4 | 1–4 | Small random values, damage rolls |
| d6 | 1–6 | Board games and general gaming |
| d8 | 1–8 | RPG actions and damage |
| d10 | 1–10 | RPGs and percentage systems |
| d12 | 1–12 | RPGs and specialized games |
| d20 | 1–20 | RPG checks and attacks |
| d100 | 1–100 | Percentile tables and random events |
The exact use of a particular die depends on the game or activity.
Why Use a Custom Dice Roller?
A physical set of dice is useful, but an online dice roller provides several conveniences.
Fast Results
You can generate a result with one click instead of manually throwing several dice.
Custom Settings
A custom tool can let you choose the number of dice and sides instead of restricting you to one fixed configuration.
Useful for Multiple Dice
Rolling five, ten, or more dice by hand can become inconvenient. An online tool can generate multiple results quickly.
No Physical Dice Required
If you are playing remotely or forgot your dice, a browser-based roller can provide a convenient alternative.
Easy to Repeat
You can roll again whenever you need another random result.
Useful for Unusual Dice
Some games and experiments may require dice with uncommon numbers of sides. A custom roller can be useful when a physical die is not available.
Custom Dice Roller vs. Physical Dice
| Feature | Custom Dice Roller | Physical Dice |
|---|---|---|
| Requires physical dice | No | Yes |
| Multiple dice | Easy to configure | Requires multiple dice |
| Unusual dice | Can be supported | Requires special dice |
| Instant repeat rolls | Yes | Yes |
| Works remotely | Yes | Not by itself |
| Hands-on experience | No | Yes |
| Easy result calculation | Yes | Manual |
Neither method is necessary for every situation. The better option depends on what you are doing.
For an online game, classroom activity, random experiment, or remote RPG session, a virtual dice roller can be particularly convenient.
Custom Dice Roller for D&D and RPG Games
Dice are an important part of many tabletop role-playing games.
A custom dice roller can be useful for:
- Attack rolls
- Ability checks
- Saving throws
- Damage rolls
- Character creation
- Random encounters
- Treasure tables
- NPC generation
- Random events
- Skill checks
- Homebrew game mechanics
For example, a player might need 1d20 + 4 for a particular check. Instead of manually rolling the die and adding the modifier, an online roller can perform the operation quickly.
D&D Beyond also provides digital dice tools and describes a custom dice roller as part of its online gaming experience.
Custom Dice for Board Games
You do not need to play an RPG to use a custom dice roller.
Board games and homemade games can also use random numbers. A custom dice roller can replace a physical die when you are playing remotely or testing a new game.
For example, a game designer could use a custom roller to generate:
- Movement values
- Random events
- Player choices
- Resource quantities
- Enemy actions
- Character attributes
This makes a dice roller useful not only for playing games but also for testing game mechanics.
Custom Dice Roller for Probability Experiments
Dice are also useful for learning about probability.
For a fair six-sided die, each individual face has an equal theoretical chance of appearing on a single roll. When you roll multiple dice and add their values, however, some totals can occur in more combinations than others.
For example, when rolling two standard six-sided dice, there are 36 possible ordered outcomes. A total of 7 can be produced in six different ways, making it more common than a total of 2, which has only one combination. Math Is Fun demonstrates this type of dice probability experiment and explains how experimental results approach theoretical probabilities as the number of trials increases.
This makes a random dice roller useful for classroom demonstrations and simple probability experiments.
Manual Dice Rolling vs. Online Dice Roller
| Task | Manual Method | Online Custom Dice Roller |
|---|---|---|
| Roll one die | Throw physical die | Click Roll |
| Roll several dice | Throw all dice | Set number of dice |
| Add modifiers | Calculate manually | Can be calculated automatically |
| Repeat experiment | Roll again | Click again |
| Record individual results | Write them down | Results can be displayed together |
| Use unusual configurations | Need special dice | May be configurable |
The online method can save time, particularly when many dice need to be rolled repeatedly.
Tips for Getting Accurate Dice Results
A dice roller is only useful when its randomization system is implemented correctly. When using an online tool, keep a few points in mind.
Check Your Settings
Before rolling, make sure you selected the correct number of dice and sides.
For example, 2d6 is very different from 2d20.
Check Your Modifier
A modifier can significantly change the final result. Make sure you enter the correct positive or negative value.
Understand the Difference Between Roll and Total
If you roll several dice, the individual results may be important. Do not look only at the total when your game requires separate values.
Run More Trials for Probability Experiments
One or two rolls cannot tell you much about long-term probability. If you are testing a probability idea, perform many trials and record the results.
Math Is Fun notes that experimental dice results may differ from theoretical probabilities when the number of trials is small, while larger experiments tend to get closer to theoretical expectations.
Common Custom Dice Roller Formats
You may see dice written using a simple notation system.
| Notation | Meaning |
|---|---|
| 1d6 | One six-sided die |
| 2d6 | Two six-sided dice |
| 1d20 | One twenty-sided die |
| 2d20 | Two twenty-sided dice |
| 1d8+3 | One eight-sided die plus 3 |
| 2d6-1 | Two six-sided dice minus 1 |
| 4d10 | Four ten-sided dice |
The first number generally represents the number of dice, while the number after d represents the number of sides.
Who Can Use a Custom Dice Roller?
A custom dice roller can be useful for many types of users.
Tabletop gamers: Quickly roll dice during RPG sessions.
Game masters: Generate random results for encounters, characters, events, and tables.
Board game players: Replace missing or unavailable dice.
Teachers and students: Demonstrate probability and random experiments.
Game designers: Test new mechanics and random systems.
Remote players: Roll dice during online games without needing physical equipment.
Anyone needing random numbers: Use dice-style randomness for simple decisions or activities.
Is a Custom Dice Roller Random?
A digital dice roller uses computer-based randomization to generate results. The goal is to produce values within the selected range without intentionally favoring a particular number.
However, a digital random-number system is not physically throwing a die. Its behavior depends on how the software is designed.
For ordinary gaming and basic probability demonstrations, a properly implemented online dice roller can be a convenient way to generate random-looking dice results.
Why Use a Free Online Dice Roller?
A free online dice roller is convenient because you can access it directly from a browser without buying a physical set of dice.
It can be especially useful when:
- You are playing an online RPG.
- You need several dice at once.
- You need to repeat rolls many times.
- You need a custom number of sides.
- You are testing a game.
- You are studying probability.
- You simply do not have physical dice available.
The biggest advantage is convenience: select your settings, roll, and get the result immediately.
Frequently Asked Questions
What is a custom dice roller?
A custom dice roller is an online tool that allows you to choose dice settings such as the number of dice and number of sides before generating random results.
Can I roll multiple dice at once?
Yes. A custom dice roller can be designed to roll multiple dice in a single action and show both individual results and the total.
What does 2d6 mean?
2d6 means two six-sided dice. Each die produces a number from 1 to 6, and the two results are normally added together.
What does 1d20+5 mean?
1d20+5 means roll one twenty-sided die and add 5 to the result. If the die produces 12, the final result is 17.
Can I use a custom dice roller for D&D?
Yes. A custom dice roller can be useful for many tabletop RPG activities, including checks, attacks, damage, and random tables. Specific games may have their own rules for how dice results are interpreted.
Can I use an online dice roller for probability experiments?
Yes. Repeated dice rolls can be useful for demonstrating probability. For meaningful experimental results, perform many rolls and compare the observed results with the theoretical probabilities.
Is an online dice roller free?
A web-based custom dice roller can be offered as a free tool. If the tool on this page is free, you can use it without purchasing physical dice.
Can I use a custom dice roller on my phone?
Yes. A responsive online dice roller can work in a mobile browser as well as on tablets and desktop computers.
What is a d100?
A d100 represents a die or dice system used to generate a result from 1 through 100. It is commonly used for percentile-style random tables.
Does a custom dice roller replace physical dice?
It can replace physical dice when you need a quick digital alternative, but physical dice may still be preferred when you want the hands-on experience of tabletop gaming.
Conclusion
A custom dice roller provides a quick way to generate random dice results without needing a physical dice set. You can choose the number of dice, select the number of sides, apply modifiers when needed, and receive your result in seconds.
Whether you are playing an RPG, testing a board game, studying probability, creating random tables, or simply need a quick random number, an online dice roller can make the process easier.
For simple rolls or complex combinations, use our free custom dice roller above to configure your dice and generate a result instantly.
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