Dice roller

Roll any number of dice with a modifier. See each die, the total, and the exact chance of rolling it.

By the Calcist team · Checked against known answers · Updated October 27, 2026

Private: calculated on your device. Nothing you type is sent anywhere.

Next: Need numbers in any range, with no repeats? Try the random number generator. Working out the odds of rolling something at least once? Use the probability calculator.

How the dice are rolled

Each die uses your browser's cryptographic random generator with rejection sampling, so every face from 1 to the number of sides has exactly the same chance. The modifier is added once to the total, as in tabletop games: 2d6 + 3 means roll two six-sided dice and add 3.

Average total = number of dice × (sides + 1) ÷ 2 + modifier

Worked example

For 2d6 the average is 2 × (6 + 1) ÷ 2 = 7. There are 6 × 6 = 36 equally likely ways two dice can land, and 6 of them add up to 7 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1). So a 7 comes up 6 ÷ 36 = 16.67% of the time, while 2 and 12 each come up only 1 time in 36 (2.78%).

Why totals bunch up in the middle

One die is flat: every face is equally likely. Add more dice and middle totals have more ways to happen, so the chances form a hill. The table under each roll shows the exact chance of every total, worked out by counting all combinations.

Limitations

Up to 100 dice with 2 to 1,000 sides each. Exact odds are shown when the number of combinations is small enough to count quickly.
Game rules like advantage, exploding dice or dropping the lowest die aren't applied. Roll and pick by hand for those.

Sources

How we checked this

Before every update, this calculator is run in a real browser with these known answers, and it must match all of them:

2d6: totals 2 to 12, average 7 ✓
1d20 + 5: totals 6 to 25, average 15.5 ✓
3d6: average 10.5 ✓
Edge: 0 dice asks for at least 1 ✓
100d1000 totals are grouped: 100 to 100,000 ✓

Last checked October 26, 2026. Spotted something wrong? The math is done in your browser with the formula shown on this page, so you can check any result by hand.

Add this calculator to your website (free)

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<p style="font:14px/1.4 sans-serif;margin:4px 0 0"><a href="https://calcist.com/dice-roller/">Dice roller</a> by Calcist</p>
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Questions people ask

What does 2d6 mean?

Roll two six-sided dice and add them. The number before the d is how many dice; the number after is how many sides each one has.

What's the most common roll with two dice?

7. Six of the 36 combinations add up to 7, a 16.67% chance.

Is an online dice roller fair?

This one is. It uses your device's cryptographic random generator and rejection sampling, so every face has exactly the same chance.

What is a d100?

A 100-sided roll, giving 1 to 100. At the table it's usually rolled as two ten-sided dice, one for tens and one for ones.

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