Dice Roller
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Standard RPG Dice Explained
Tabletop RPGs like D&D use a standard set of polyhedral dice. Each die is named for its number of faces: D4 (tetrahedron), D6 (cube), D8 (octahedron), D10 (pentagonal trapezohedron), D12 (dodecahedron), D20 (icosahedron).
D20 — The King
Used for attack rolls and ability checks in D&D. A natural 20 is a critical hit. A natural 1 is a critical failure.
Modifiers
In RPGs, add your ability score modifier to the roll. A +3 STR modifier means you add 3 to every strength-based roll.
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Frequently Asked Questions
What is a D20 critical hit?+
In D&D 5e, rolling a natural 20 (before modifiers) on an attack roll is a critical hit. You roll the damage dice twice and add modifiers once. A natural 1 is a critical miss regardless of modifiers.
How do I roll 2D6 plus 3?+
Set dice type to D6, count to 2, modifier to +3. The total shows (die1 + die2 + 3). Standard D&D notation: 2d6+3.
What is advantage/disadvantage in D&D?+
Advantage means roll 2D20 and take the higher result. Disadvantage means take the lower. Use this tool by rolling 2 dice and looking at the individual results to simulate advantage/disadvantage.
What does the D100 represent?+
Also called a percentile die. Roll 1d100 to get a result from 1 to 100. Used for percentage-based random tables, some RPG skill systems, and probability experiments. In physical dice, two D10s (one for tens, one for units) are typically used.
How is a D4 used in D&D?+
D4 is used for small damage weapons (daggers, darts), some spells like Magic Missile, and short rest hit point recovery for certain classes. It is the most awkward die to roll physically but works perfectly online.
Can I roll more than 6 dice at once?+
Yes, up to 100 dice simultaneously. The individual results are shown, plus the total with modifier. Results are animated in sequence.
What is the average result for each die type?+
D4: 2.5 | D6: 3.5 | D8: 4.5 | D10: 5.5 | D12: 6.5 | D20: 10.5 | D100: 50.5. The average is always (max+1)/2 for any fair die.
Can I use this for board games?+
Yes. Standard board games use D6. Games like Risk use multiple D6. Some games use D8 or D10. This roller handles all of these.
What is a custom-sided die?+
Enter any number of sides (2 to 10,000). A D2 is equivalent to a coin flip. A D3 (results 1, 2, 3) is sometimes used in RPGs. A D7 and other unusual dice are used in some specialty games.
How do I simulate a D&D character stat roll?+
Stats are rolled 4D6 drop lowest. Roll 4 dice, remove the lowest value, sum the remaining three. Do this 6 times for your six ability scores.