D100 dice roller

A 100-sided die in one click

This page opens the dice roller set to a 100-sided die, the d100. Click "Roll the dice", click the die or press the space bar: a number from 1 to 100 appears. Your browser's cryptographic random number generator draws that number directly, with the same chance for every value, and nothing is sent.

You can roll up to 20 dice at once with their total, change the "Number of sides" or use the "Quick picks". "Latest rolls" shows your last 12 results.

What is a d100 used for?

At the table, a d100 is almost always a pair of ten-sided dice: one gives the tens (00, 10, 20…), the other the units (0 to 9). You add them, and 00 with 0 reads as 100. A true 100-sided die also exists, nearly spherical, but it rolls forever and is hard to read. The online die avoids both problems.

• Percentile checks: in some tabletop role-playing games, a skill is a score out of 100 and the action succeeds if the die rolls that score or lower.
• Random tables: encounters, treasure, weather, rumors. Each row covers a range, for example 01 to 60, 61 to 90, 91 to 100.
• Rolling a percentage to settle an event: "it rains on a 30 or lower".

The odds with a d100

Each value has a 1 in 100 chance, or 1%. A range of numbers therefore has as many percent as it holds values: with a score of 65, the check succeeds on 1 to 65, so 65% of the time. In the example table above, the three rows come up 60%, 30% and 10% of the time. The average is (1 + 100) ÷ 2 = 50.5.

Frequently asked questions

Is the result the same as with two ten-sided dice?

Yes. Two fair d10 give 100 combinations, one per number from 1 to 100, each at 1%. The tool draws the number directly, without going through tens and units.

Can I roll with a 20-point penalty?

The tool does not apply modifiers: roll, then subtract the 20 points in your head before comparing with your score.