Roll a D20

Roll a d20 online

One tap, one twenty-sided die, rolled in 3D on a felt table. Add your modifier, roll with advantage or disadvantage, and set the DC (the number you need to reach) to see your chance before you roll and whether you made it after. A natural 20 glows gold, a natural 1 red. You can also drag across the table to throw the die yourself, or press the space bar.

Roll a D20: a sapphire d20 on navy felt with its total and Success vs 15, beside the modifier and the DC

What it does

• A real d20: an icosahedron with opposite faces adding up to 21, thrown with physics; the face on top is the roll.
• Modifier: add or take away, from −20 to +30.
• Advantage and disadvantage: two d20s, keep the higher or the lower.
• DC and your chances: the chance to reach the DC with your modifier, then Success or Miss on the table.
• Natural 20 and natural 1 stand out, with a sound.
• Roll together: share a table with your group; everyone sees each roll land.

D20 odds

Each face of a d20 comes up 5% of the time, so the chance to reach a number is simple: 15 or more is 6 faces of 20, 30%. Each +1 to your modifier adds 5%: with +3, 15 or more is 45%. Advantage makes the same roll 51%, and a natural 20 9.75%; disadvantage makes it 9%. Set your modifier and the DC and the chart shows it for your exact roll.

Frequently asked questions

Is this d20 random?

Yes. Each throw starts from random spins and speeds from your browser’s cryptographic random numbers, and physics decides how the die lands. We threw it hundreds of times in testing and every face came up about as often as the others.

What is a natural 20?

The die itself showing 20, before any modifier. In Dungeons & Dragons an attack roll with a natural 20 is a critical hit, and a natural 1 always misses. The chance of either is 1 in 20.

Rolling more than a d20? The D&D Dice Roller takes any dice notation, saves your attacks and rolls ability scores, and the Dice Roller holds and rerolls dice for board games.