Is a d100 a real 100-sided die or two d10s?

Both are valid. A physical d100 is a ball-like die with 100 numbered faces. In many RPGs, d100 also means percentile dice: two d10s, one for tens and one for units.

How do you read 00 and 0 on percentile dice?

In the common 1–100 tabletop convention, 00 on the tens die plus 0 on the units die is read as 100. 00 plus 7 is 7, and 40 plus 2 is 42.

Which d100 mode should I use?

Use percentile dice for most D&D and tabletop random tables because two d10s are easier to read. Use physical d100 mode when you specifically want to simulate a real 100-sided die.

D100 roller

Roll a physical d100 or RPG percentile dice.

A d100 has two legitimate meanings at the table. Dice Roller supports both: one animated 100-face physical die, or the RPG-standard percentile pair with tens and units d10s.

Fast answer d100 ≠ one meaning Physical d100 exists; percentile 2d10 is the RPG default.

Use the d100 roller

Open the main tool, type 1d100 for the physical die, or choose percentile mode for RPG d100:

Physical d100 — 100 faces: the default: one modeled, animated 100-face die.
Percentile dice — 2d10: the tabletop option for loot tables, encounters, and percentile systems.

Open the d100 roller

How percentile d100 works

Percentile dice use two ten-sided dice. One die reads tens: 00, 10, 20…90. The other reads units: 0–9.

Tens die	Units die	Result
`00`	`0`	100
`00`	`7`	7
`40`	`2`	42
`90`	`9`	99

Physical d100 vs percentile dice

A physical d100 is real, but it is less common at many RPG tables because the ball-like shape can be slower to settle and harder to read. Percentile dice are faster: two d10s give the same 1–100 range and the result is immediately visible.

The tool keeps both modes because players search for “d100 roller” with different expectations.

Common d100 uses

Random encounter and treasure tables.
Percentile RPG systems and skill checks.
Critical hit tables, wild magic tables, mishap tables, and downtime events.
Board-game or solo-RPG prompts that need a 1–100 result.

D100 questions

Is d100 the same as d%?

Usually yes in RPG notation. d% means a percentile roll from 1 to 100, normally read with two d10s.

Does this site roll a real 100-face die?

Yes. Physical d100 mode uses one modeled 100-face die in the 3D engine. Percentile mode uses two d10s.

What is the chance of rolling 100?

One result out of 100: exactly 1% in either mode when the random source is uniform.

Related dice guides

D20 & D&D guide · Dice notation · Dice probability · FAQ