Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total
9
Individual rolls
3, 6
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter how many dice.
- 2Enter sides per die.
- 3Enter re-roll (any number to re-randomize).
- 4Read your total on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Standard tabletop dice roller — supports d4, d6, d8, d10, d12, d20, d100.
Worked example
Using the values the calculator loads with:
Inputs
- How many dice: 2
- Sides per die: d6
- Re-roll (any number to re-randomize): 0
Results
- Total: 10
- Individual rolls: 5, 5
What each field means
Inputs
- How many dice
- The how many dice used in the calculation. Starts at 2 so you have a working example on load. Accepted range: 1–100.
- Sides per die
- Pick the option that matches your situation — the maths changes per option. Choices: d4, d6, d8, d10, d12, d20, d100.
- Re-roll (any number to re-randomize)
- The re-roll (any number to re-randomize) used in the calculation. Starts at 0 so you have a working example on load.
Results
- Total
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Individual rolls
- Returned as a plain value. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the dice roller work?
Standard tabletop dice roller — supports d4, d6, d8, d10, d12, d20, d100.
What do I need to enter?
3 values: how many dice, sides per die, and re-roll (any number to re-randomize). Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the total result mean?
It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are rounded for display; the underlying calculation keeps full precision.
Who is this tool for?
It's built for students, developers, and anyone who needs the answer right now without setting up a spreadsheet.
Accuracy and limitations
- Results are rounded for display; the underlying calculation keeps full precision.
- Very large or very small inputs may hit floating-point limits in the browser.
- Inputs outside the accepted range are clamped rather than rejected.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Dice Roller. Retrieved from https://www.revenuelab.fyi/toolbox/dice-roller
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/dice-roller" target="_blank" rel="noopener">Dice Roller — RevenueLab</a> (2026).</p>
Source: [Dice Roller — RevenueLab](https://www.revenuelab.fyi/toolbox/dice-roller) (2026).