DnD Dice Rollers

D20 Dice Roller

Tap the big die to roll a twenty-sided die. Set your bonus once and every roll adds it for you, so an attack, a saving throw or an ability check takes one tap. Natural 20s and natural 1s are called out, and the history keeps your last rolls.

Roll a d20

Tap the d20 to roll.

Total–

Roll history

0 rolls • Running total of the last 50 rolls 0

Your rolls will appear here, newest first.

    How the d20 roller works

    Set the modifier with the − and + buttons (or type it), then tap Roll d20. The big number is the die as it landed and the total underneath includes your modifier. Switch on Advantage or Disadvantage to roll two d20s and keep the higher or lower; both dice stay on screen so the table can see them.

    d20 odds at a glance

    Each face of a fair d20 has a 1 in 20 chance (5%). That makes the chance of rolling a target number or higher easy to work out: every point you need below 21 is worth 5%.

    Chance to roll a number or higher on one d20
    Need on the dieChance
    2+95%
    5+80%
    8+65%
    10+55%
    11+50%
    12+45%
    15+30%
    18+15%
    20+5%

    The average roll is 10.5. A +5 modifier shifts every row down by five, so a 15 becomes as easy as a natural 10.

    When you roll a d20 in D&D

    • Attack rolls: d20 + attack bonus against the target's Armor Class.
    • Ability checks: d20 + ability modifier (+ proficiency if trained) against a Difficulty Class set by the DM.
    • Saving throws: d20 + save bonus to resist a spell, poison or trap.
    • Initiative: d20 + Dexterity modifier at the start of combat.
    • Death saving throws: a plain d20; 10 or higher is a success, a natural 20 brings you back with 1 hit point.

    Typical Difficulty Classes

    DMs usually pick a DC from a short ladder. Compare it with the table above to see your chances before you roll.

    TaskDCChance on a plain d20 (no modifier)
    Very easy580%
    Easy1055%
    Medium1530%
    Hard205%
    Very hard25needs at least +5
    Nearly impossible30needs at least +10

    Need other dice too?

    For damage dice and mixed rolls such as 1d8+1d6+3, use the full D&D dice roller. For a closer look at rolling two d20s, the advantage roller shows the exact odds.

    Last reviewed October 26, 2026. Odds in the tables are worked out exactly, not simulated.

    Frequently asked questions

    What is the chance of rolling a natural 20?

    5%, or 1 in 20, on a single d20. With advantage it rises to 9.75%, because either of the two dice can show the 20. With disadvantage it falls to 0.25%.

    Is a natural 20 always a success?

    On an attack roll a natural 20 always hits and is a critical hit. For ability checks and saving throws, the official rules do not make a natural 20 an automatic success, although many tables play it that way.

    How do I add my modifier?

    Use the minus and plus buttons next to Modifier, or type a number between -30 and +30. The die result and the total with your modifier are both shown.

    Does the d20 roller remember my modifier?

    No, the modifier resets when you reload the page. Your roll history and the sound setting are kept in this browser.

    Why do I sometimes get the same number twice in a row?

    Each roll is independent, so the chance that the next roll matches the last one is 1 in 20. Streaks happen with real dice too.

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