🎲 D20 Dice Roller
Roll a 20-sided die online for D&D, Pathfinder and all tabletop RPGs.
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About D20 Dice Roller Dice
Roll a 20-sided die online for D&D, Pathfinder and all tabletop RPGs.
Use this free online dice roller anytime — perfect for online gaming sessions, when you've lost your physical dice, or for quick decisions. Works on all devices with no download required.
Frequently Asked Questions — D20 Dice Roller
Complete guide to the D20 die for tabletop RPG players
What is a D20 die?
A D20 is a 20-sided icosahedral die, the most iconic die in tabletop RPGs. It has 20 equilateral triangular faces numbered 1-20. The D20 is the primary die in Dungeons & Dragons, used for attack rolls, ability checks, and saving throws.
What is the average result on a D20?
The average result of a D20 roll is 10.5. Each number from 1-20 has an equal 5% probability of appearing. This uniform distribution makes it ideal for determining success or failure with a clear cutoff.
What is a "natural 20" in D&D?
A natural 20 (Nat 20) means rolling a 20 on the D20 before any modifiers. In D&D 5e, this is a Critical Hit on attack rolls, automatically dealing extra damage. On ability checks, it's not automatically a success unless the DM allows it.
What is a "natural 1" in D&D?
A natural 1 is rolling a 1 on the D20. On attack rolls in D&D 5e, it is an automatic miss. Some DMs implement "critical fumble" tables for natural 1s on ability checks, though this isn't an official rule in 5e.
What does "roll with advantage" mean?
Rolling with advantage means you roll 2D20 and take the higher result. This represents favorable circumstances. Conversely, "disadvantage" means rolling 2D20 and taking the lower result. Our D20 roller supports both modes.
What is the probability of rolling 15 or higher on a D20?
The probability of rolling 15 or higher on a D20 is 6/20 = 30%. Specifically, rolling 15, 16, 17, 18, 19, or 20 — 6 outcomes out of 20 possible results.
How does the D20 work in Pathfinder?
Pathfinder uses the D20 as its core die, similar to D&D. Roll D20 + modifiers against a Difficulty Class (DC). Pathfinder 2e adds a Degree of Success system: exceeding DC by 10+ is a Critical Success, failing by 10+ is a Critical Failure.
Can I add modifiers to my D20 roll?
Yes! In D&D and Pathfinder, you add ability score modifiers, proficiency bonuses, and situational bonuses to your D20 roll. For example, an attack roll might be D20 + 5 (ability modifier) + 4 (proficiency bonus) = D20+9.
What is DC in D&D and Pathfinder?
DC stands for Difficulty Class — the target number your D20 roll must meet or exceed to succeed. Easy tasks have DC 10, moderate DC 15, hard DC 20, and nearly impossible tasks DC 30. The DM sets DCs based on the challenge.
Is the D20 used in other games besides D&D?
Yes! The D20 is used in Pathfinder, Starfinder, D&D 5e, older D&D editions, 13th Age, Mutants & Masterminds, and many other d20 System games. It's also used in some board games and can be used as a random number generator.
How many sides does a D20 have and what shape is it?
A D20 has 20 sides and is an icosahedron — one of the five Platonic solids. It has 20 equilateral triangular faces, 30 edges, and 12 vertices. Opposite faces of a standard D20 sum to 21.
What happens when two players roll the same number?
In D&D, ties in combat initiative are broken by the Dexterity modifier. Ties in opposed checks (like grappling) usually go to the defender. Different systems handle ties differently — check your specific game's rulebook.