Dice Roller — Roll d4, d6, d20 and More Online

Online dice roller

Roll virtual dice — any number, any number of sides, with a modifier. See each result and the total.

How many Sides Modifier

▌ Result

Roll any dice, anywhere

Pick how many dice, choose the number of sides — d4 through d100 — add an optional modifier, and roll. Each die's individual result is shown along with the grand total, so it works for everything from a single coin-flip-style decision to a fistful of dice for a tabletop game. No physical dice required, and nothing to install.

For tabletop games

This covers the dice notation tabletop players know well: "3d6+2" means roll three six-sided dice and add two, which this tool handles directly. Dungeons & Dragons leans on the d20 for almost every check, while damage and stats use combinations like 2d6 or 4d6 — all supported here. Seeing each die separately (not just the total) matters in many games, where rolling doubles or a natural 20 triggers special rules.

Fair, random rolls

The rolls use your browser's random generator, giving each face an equal chance — the digital equivalent of a perfectly balanced die, without the table-edge tumbles. That makes it handy beyond games too: pick a random winner, settle a "who goes first," or make any quick unbiased decision. For picking a number in a specific range instead, the random number generator gives you finer control.

Why 3d6 and d18 are not the same

Both cover a range, but the shape of the results is completely different, and that difference is the whole reason tabletop systems specify one over the other.

A single die is flat: every face on a d20 comes up 5% of the time, so a 1 is exactly as likely as a 20. Adding dice together produces a bell curve, because there are far more ways to make a middling total than an extreme one. With 3d6 the range is 3–18 with a mean of 10.5, but 10 and 11 each appear about 12.5% of the time while a 3 appears only 0.46% — once in 216 rolls.

The practical consequence: a flat die makes outcomes swingy and dramatic, whereas summed dice make them predictable and clustered around the average. With 2d6, a 7 comes up 16.7% of the time against 2.8% for snake eyes.

Reading dice notation

3d6 — roll three six-sided dice and add them together.
3d6+2 — the same, then add a flat modifier of 2. Modifiers shift the whole curve without changing its shape.
1d20 — a single twenty-sided die, the flat roll used for most checks in d20-based systems.
d100 (or 1d100) — a percentile roll, traditionally made with two ten-sided dice reading tens and units.

The notation is read the same way everywhere it appears, which is why a rulebook can write "4d8+3" and expect no ambiguity.

Fairness, and physical dice

Every roll draws from crypto.getRandomValues(), the browser's cryptographically secure generator, so each face has an equal chance and the results cannot be predicted from earlier ones. Nothing is sent anywhere; the rolls happen on your device.

Digital dice are in one respect fairer than physical ones. Real dice can be measurably biased by manufacturing tolerances — hollowed pips shift weight toward the opposite face, and cheap dice are often slightly out of true. Casino dice are made with flush, filled pips and sharp edges precisely to eliminate this. If you want to check a physical set, roll one die a few hundred times and compare the counts; a genuinely fair die should stay reasonably close to even.

FAQ

What dice can I roll?

Standard polyhedral dice: d4, d6, d8, d10, d12, d20, and d100. Set how many you want to roll at once.

Can I add a modifier like +3?

Yes — enter a positive or negative modifier and it's added to the sum of the dice, shown alongside the raw roll total.

Are the rolls fair?

Each die uses the browser's cryptographically secure random generator, so every face has an equal chance.

What does 3d6+2 mean?

Roll three six-sided dice, add them together, then add 2. The first number is how many dice, the number after the d is how many sides, and anything after the + or − is a flat modifier applied to the total.

Is rolling 3d6 the same as rolling one 18-sided die?

No. A d18 would be flat, with every result equally likely. Summing 3d6 produces a bell curve over 3 to 18: totals of 10 and 11 each come up about 12.5% of the time while a 3 appears only 0.46% of the time, because there are far more combinations that make a middling total.

Are digital dice fairer than real ones?

Usually, yes. These rolls use the browser's cryptographically secure random generator, so every face is equally likely. Physical dice can be slightly biased by manufacturing tolerances — hollowed pips move weight toward the opposite face — which is why casino dice use flush, filled pips.