1d10

1d10 refers to rolling one ten-sided die. In tabletop role-playing games and probability exercises, dice are denoted with a "d" followed by the number of sides: XdY. Thus 1d10 means a single die with ten faces. A standard d10 is a pentagonal trapezohedron; it has ten faces, each labeled with a number from 0 to 9 (or 1 to 10 in some sets). In many games the 0 face is interpreted as 10. The die is designed to be fair, giving each face a 1/10 chance of landing face up, assuming proper manufacture and fair rolling.

In gameplay, 1d10 is commonly used for damage, random determination, or skill checks, depending on the system. It is often used in combination with modifiers, e.g., 1d10 + 3. In percentile systems, two d10s are rolled to generate a number from 01 to 100: one die represents the tens place and the other the units; many conventions interpret 00 as 100. Some sets label faces as 1–10 instead of 0–9, avoiding the need to interpret the 0.

Manufacturers produce d10s in various styles, including translucent, opaque, or marbled plastics, with engraved numerals or pips. In the broader dice ecosystem, the 1d10 sits alongside other polyhedral dice such as d4, d6, d8, d12, and d20. It is a standard component of many role-playing game kits and is used across a range of genres and rule systems.