Dice Roller
Pick the die, how many to roll and a modifier, then press Roll again for a new roll. For D&D 5e you can roll a d20 with advantage or disadvantage, or roll 4d6 and keep the highest three. Each roll is added to the history below.
Your numbers
How we calculate it
Each die is a random whole number from 1 up to its number of sides, all equally likely. The total is the sum of the dice you keep plus the modifier. Two six-sided dice add up to between 2 and 12, with 7 the most common.
Advantage and disadvantage come from Dungeons & Dragons 5th edition: roll the d20 twice and keep the higher (advantage) or the lower (disadvantage). Keep highest is used for ability scores: roll 4d6 and keep the highest 3.
The numbers come from a seeded pseudo-random generator that gets a new seed on every roll. It is fine for games, but not for gambling or anything that must be unpredictable.
Assumptions and limits
- The roll history shows the rolls since you opened this page. It lives only in your browser and is cleared when you leave.
- A natural 20 or natural 1 is shown when you roll a single d20 or use advantage or disadvantage.
- Not suitable for gambling or for choosing secrets or passwords.
Frequently asked questions
How do I roll with advantage in D&D?
Choose advantage, keep the die as a d20, and press Roll. The calculator rolls two d20 and keeps the higher one; the lower one is shown in brackets.
How do I roll ability scores?
Roll four six-sided dice, keep the highest three and add them. Set 4 dice, keep 3, die d6, and press Roll again six times.
Are the rolls really random?
They come from a pseudo-random generator, which behaves randomly for games. Every face is equally likely and rolls do not depend on earlier ones.
What is the chance of rolling a natural 20?
One in 20, or 5%. With advantage it rises to about 9.75%, and with disadvantage it falls to 0.25%.
Can I roll many dice at once?
Yes, up to 100 dice of one size. The total, the lowest and highest possible totals and the average roll are shown.
Related calculators
- Random Number GeneratorSet the smallest and largest number and how many you want.
- Probability CalculatorEnter the chance of event A and event B as percentages, and the number of times you try A.
- Permutation and Combination CalculatorEnter the total number of items n and how many you choose, r.
- Percentage CalculatorThree common percentage problems in one place.
Worked example (a fixed example using the starting numbers, it does not change as you type)
Inputs: Roll type = Normal roll; Die = d20; Number of dice = 1; Modifier (+ or −) = 0.
- Total 8
- Roll 1d20
- Dice 8
- Sum of kept dice 8
- Modifier 0
- Lowest possible 1
- Highest possible 20
- Average roll 10.5
- Natural roll 8
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