Roll a D100
Roll a hundred-sided die online
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What Is a D100, and How Do I Roll One Online?
The D100, or percentile die, gives a result from 1 to 100 in one roll — no need to roll two D10s and read them as "tens" and "ones" digits. It's the backbone of percentage-based systems: Call of Cthulhu, Warhammer Fantasy Roleplay, and other BRP-based games ask players to roll under a skill percentage, while D&D and Pathfinder use it for critical hit charts, random encounter tables, and treasure tables. RollAD20 rolls the full 1–100 range directly, so percentile checks and loot rolls are a single tap instead of doing tens-and-ones math in your head.
Frequently Asked Questions
What is the average roll on a D100?
50.5 — the midpoint between 1 and 100, calculated as (1 + 100) ÷ 2.
How do you roll percentile dice with two D10s?
Roll two D10s of different colors: one is designated the "tens" digit and the other the "ones" digit. A 0 and 0 together reads as 100. RollAD20 skips this by rolling the 1–100 result directly.
What games use percentile dice?
Percentage-based systems like Call of Cthulhu, Warhammer Fantasy Roleplay, and RuneQuest use D100 rolls as their core "roll under your skill" mechanic. D&D and Pathfinder use it for tables — critical hit charts, random encounters, and treasure generation.
Is rolling a single D100 the same as rolling two D10s?
Statistically, yes — both give a uniform result from 1 to 100 with equal probability for every number. RollAD20's D100 roller generates that result directly using the browser's cryptographically secure random number generator, so it's just as fair as the two-dice method.
Is this dice roller random and fair?
Every roll uses your browser's cryptographically secure random number generator (the Web Crypto API), so every face has an equal chance of coming up — the same fairness you'd expect from a physical die, no biased algorithm involved.