Dice Rollers
D&D Dice Roller
Roll a d20, a full damage set or a stat block in one press, with advantage, disadvantage and modifiers built in.
D&D Dice Roller
1d20 · total 17
Choose the die
Roll type (d20 checks)
How to use the D&D dice roller
- Tap the die you need, from d4 up to d100, and set how many to roll.
- Add the modifier from your sheet, and switch to advantage or disadvantage for d20 checks.
- Tick Drop the lowest die when rolling ability scores the 4d6 way.
- Press Roll dice and read each die plus the total.
The polyhedral set and what each die is for
Every die in the standard set has an average roll of half its size plus a half, which is worth knowing when you weigh up weapons and spells.
| Die | Average roll | Typical use at the table |
|---|---|---|
| d4 | 2.5 | daggers, healing potions per die |
| d6 | 3.5 | shortswords, sneak attack dice, fireball per die |
| d8 | 4.5 | longswords, rapiers, hit dice for many classes |
| d10 | 5.5 | heavy crossbows, pike damage |
| d12 | 6.5 | greataxes, barbarian hit dice |
| d20 | 10.5 | every check, save and attack roll |
| d100 | 50.5 | percentile tables and wild magic |
What advantage really gives you
Advantage rolls two d20 and keeps the higher, and the numbers behind it are exact: across all 400 possible pairs the kept die averages 13.825 against 10.5 for a single roll, a gain of 3.325. Disadvantage mirrors it at 7.175. The famous edge cases move even more: a natural 20 arrives 9.75 percent of the time with advantage instead of 5, and only 0.25 percent with disadvantage. This roller shows both dice with the kept one highlighted, so the table sees the same maths happen.
Rolling ability scores
The classic method rolls 4d6 and drops the lowest die, which this roller does with the drop the lowest option. Dropping the low die lifts the average score from 10.5 on a plain 3d6 to about 12.24, which is exactly why the method produces heroes rather than commoners. Roll six times for a full array, then copy the set for your sheet.
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Frequently asked questions
Which dice can I roll
The full polyhedral set, d4, d6, d8, d10, d12, d20 and d100, one at a time or many at once with a modifier added to the total.
How do advantage and disadvantage work
On a d20 check the tool rolls two dice and keeps the higher for advantage or the lower for disadvantage, showing both so the table can see the roll.
Can I add a modifier
Yes. The modifier is added to the total after the dice are summed, so 1d20 plus 5 or 2d6 plus 3 work as written.
Are the rolls fair
Yes. Every face has the same chance on each roll, drawn from the browser cryptographic random source, and rolls do not depend on the last.
Is it free
Yes, free and with no sign up. Every roll runs in your browser and nothing you enter leaves your device.
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Need to type a full expression? Use the dice notation roller. For a single d20 keep or drop, the advantage roller is quicker.