Roll a D20 Online
Attack rolls, saving throws, ability checks — roll your D20 here.
When Do You Roll a D20?
The twenty-sided die is the foundation of Dungeons & Dragons 5th Edition and all d20-system games. You roll a D20 whenever you attempt an action whose outcome is uncertain:
- Attack rolls — does your sword hit the enemy?
- Ability checks — can you pick the lock, jump the chasm, or persuade the guard?
- Saving throws — do you resist the dragon's fire breath or the wizard's charm spell?
Add your modifier to the result, then compare to the target's Armor Class or the Difficulty Class set by the DM.
Advantage and Disadvantage
In DnD 5e, some situations call for advantage (roll two D20s, use the higher) or disadvantage (roll two, use the lower). Use the mode buttons above to simulate this automatically.
A natural 20 is a Critical Hit on an attack roll — maximum effect. A natural 1 is a Critical Failure, always missing regardless of bonuses.
D20 Roller vs. the Main Dice Tool
This page is built specifically around the D20 workflow — Normal, Advantage, and Disadvantage modes in one click, with a running history so you can review a whole session at the table. If you need other die types (D4 through D100) or want to roll several dice of the same type together, use the main dice roller. For a quick binary yes/no outside the d20 system, the coin flip tool works the same way.
D20 Roller FAQ
Is this D20 roller free to use online?
Yes, completely free with no signup and no limit on rolls. Roll a single D20, or switch to advantage/disadvantage mode for two dice at once.
What games use a D20 roller?
Dungeons & Dragons 5th Edition and Pathfinder are the most common, but any d20-system tabletop RPG — including Starfinder and many OSR retroclones — relies on the same twenty-sided mechanic for checks, attacks, and saves.
How does advantage work in DnD 5e?
When you have advantage, you roll two D20s and use the higher result. Disadvantage is the opposite — roll two, use the lower. Both apply before adding any modifiers, and they never stack (having advantage twice is still just advantage).
What happens on a natural 20 or natural 1?
A natural 20 on an attack roll is always a critical hit, dealing extra damage regardless of your modifier. A natural 1 on an attack roll always misses. For ability checks and saving throws, whether nat 1/nat 20 auto-succeed or auto-fail depends on your table's house rules — the core 5e rules only guarantee the auto-hit/auto-miss effect for attack rolls.
Can I see my previous D20 rolls?
Yes. Every roll is added to the History panel below the result, showing the mode used and the dice kept, so you can track a session without writing anything down.