D&D Dice Roller
Fair rolls, advantage and disadvantage, damage formulas like 3d6+2, percentile d100, and optional DM controls for pacing a session.
Quick presets
One-tap rolls for the situations that come up most. Modifier comes from the D20 check section's modifier where relevant.
Quick roll
Tap any die to roll one of them.
Multiple dice
Roll several dice and add a modifier.
Custom formula
Type a dice formula. Supports 2d6+3, 4d8-1, 1d100, 2d20kh1 (advantage), 2d20kl1 (disadvantage).
D20 check
Roll a d20 with a modifier. Use advantage to take the higher of two d20s, or disadvantage to take the lower.
Damage roll
Roll damage like 2d6, 3d8+5, or 8d6.
Percentile (d100)
A roll from 1 to 100. Traditionally rolled as two d10s — one for the tens digit, one for the ones — and Spinly shows both.
DM Controls off
Use for DM pacing, demos, testing, storytelling, or agreed controlled sessions. Do not use DM Controls for paid, regulated, or deceptive draws. The result panel stays visually identical to a fair roll — only this section shows that DM Controls are on.
Fair mode — standard random rolls with no controls applied. This is the default.
Preset next result — queue specific results. Each is used once, in order, for the matching die, then everything goes back to fair until you queue more.
D20 outcome quick controls — specifically for D20 checks, advantage and disadvantage. The kept die will match this preset.
Sequence mode — each matching die roll consumes the next value in the list. Invalid values (out of the die's range) are skipped silently.
Weighted mode — change probability by setting numeric weights per face. Weight 0 blocks a face. Weight 1 = normal. Weight 2 = twice as likely as a weight-1 face. Percentages update live.
| Face | Weight | Chance |
|---|
Roll history
Your last 20 rolls, kept only in this browser tab.
How D&D dice work
Tabletop role-playing games like Dungeons & Dragons use a small family of dice. Each one is named after its number of sides. A d20 is the twenty-sided die that handles most of the action — attack rolls, ability checks, saving throws. The others handle damage and the smaller mechanical bits.
The seven dice in a standard set
- d4 — a four-sided pyramid. Usually shows up for small daggers, magic missiles, and other low-damage rolls.
- d6 — the regular cube you'd find in any board game. The most common damage die.
- d8 — an eight-sided die, used for medium weapon damage and many healing spells.
- d10 — a ten-sided die used for damage and (in pairs) for percentile rolls.
- d12 — a twelve-sided die for big weapons like greataxes.
- d20 — the headline act. Used whenever the game asks "did it work?" Roll the d20, add your modifier, compare it to a target.
- d100 — a hundred-sided result, almost always made from two d10s: one for the tens place, one for the ones. Used for random tables and percentage-based effects.
What dice notation means
Dice notation looks intimidating but it's really shorthand. 3d8+5 reads as "roll three eight-sided dice, sum them, then add five." You'd write it that way for, say, a damage roll that uses three d8s plus a strength bonus.
The general pattern is XdY+Z:
- X — how many dice to roll
- Y — how many sides each one has
- Z — a flat number added (or subtracted) at the end
Just d20 by itself means the same as 1d20. The "keep highest" and "keep lowest" extensions look like 2d20kh1 (roll two d20s, keep the higher) and 2d20kl1 (roll two d20s, keep the lower). Those handle advantage and disadvantage.
Advantage and disadvantage, plainly
When the game gives you advantage, you roll two d20s instead of one and use whichever showed the higher number. It tilts the odds in your favour without changing the maximum.
Disadvantage is the mirror image. Roll two d20s, take the lower.
When each die gets used
The d20 answers questions about success or failure. The smaller dice (d4 through d12) usually decide how much rather than whether. The d100 handles "what happens next" — random tables, wild magic surges, anything where the rulebook gives you a list of possible outcomes.
Frequently asked questions
What dice do you need for D&D?
A standard set has seven dice: d4, d6, d8, d10, d12, d20 and d100. Spinly's roller has all seven, plus advantage, disadvantage and custom dice formulas.
What does 2d6 mean?
It means roll two six-sided dice and add their results. 2d6 produces a number between 2 and 12, with 7 being the most likely total.
What does 1d20+5 mean?
Roll one twenty-sided die, then add 5 to whatever it shows. A roll of 14 becomes 19. This is the most common formula in D&D, used for attacks, checks and saves where you add an ability modifier.
How does advantage work?
You roll two d20s and use the higher of the two. It nudges the odds in your favour without changing the maximum possible roll.
How does disadvantage work?
The opposite of advantage: roll two d20s and use the lower one. It makes successes harder without removing them entirely.
What is a d100 roll?
A percentile roll producing a number from 1 to 100. Random encounter tables, wild magic effects, and loot drops often use it. With physical dice it's usually two d10s — one for the tens digit and one for the ones.
Can I use this dice roller on mobile?
Yes. The whole page works on phones and tablets. Buttons are big enough to tap comfortably, the result display stays readable, and the history scrolls.
Does Spinly save my rolls?
Recent rolls are kept only in this browser tab — nothing is sent anywhere. Use the Clear button to wipe history. When you close the tab, history clears automatically too.
Note: Dungeons & Dragons and D&D are trademarks of Wizards of the Coast. Spinly is an unofficial fan-made dice roller and is not affiliated with or endorsed by Wizards of the Coast. No official artwork, logos, or rules text are reproduced here.