Dice Roller

Most free dice rollers give you one kind of die at a time, or a single total with no way to check the dice behind it. That falls apart the moment a real turn shows up: a d20 to hit, then weapon damage plus a bonus die plus your modifier, all resolved together. This roller does the whole thing in one throw. Type 1d20 + 1d6 + 3, or tap the die buttons to stack up a pool, and the total lands up top with every individual die shown below it. Dropped dice get struck through, a max face turns green, and a natural 1 turns red. No sign-up, nothing to install, and nothing leaves your browser.

It reads standard dice notation, from a plain 1d20 to 4d6kh3 for rolling a stat, and it works for any die from 2 up to 1000 sides. Think of it as a full dice bag living in a tab, ready for D&D and Pathfinder, board games when the real dice have gone missing under the couch, or a probability lesson. And it does one thing most rollers skip, it shows the range and the average of your roll before you ever press the button.

1. Tap dice to build a pool. Hit + d20, + d6, or any die button to drop it in the box. Tap the same one again and the count climbs, so three taps on d6 becomes 3d6. Mix as many types as you want.
2. Or type the roll yourself. Click into the box and enter notation like 2d6, 1d20+5, or 4d6kh3. If something doesn't parse, the box tells you on the spot, so you're never left guessing what went wrong.
3. Set a modifier. Use the plus and minus Modifier buttons to nudge a flat number onto the total, or just type + 3 or - 1 at the end yourself.
4. Or grab a preset. The common-roll buttons load the ones people reach for most: a plain d20, advantage, disadvantage, the 4d6-drop-lowest stat roll, 2d6, and percentile.
5. Roll. Press Roll, or hit Enter while your cursor is in the notation box. The big number is the total. Each die's value sits underneath.
6. Reuse and share. Recent rolls keeps your last several throws with a one-tap Reuse. Share copies a link that reopens the exact roll, and Embed drops the live roller onto your site.

A single roll can hold as many different dice and modifiers as you need. 1d20 + 1d6 + 3 is one throw with two dice and a bonus, summed together, which is exactly what you want when a hit deals weapon damage plus a splash of fire on top. Chain more terms and it keeps adding them up. That's the piece simple rollers miss, and it's the difference between one clean result and juggling three rolls in your head.

The breakdown underneath is the other half. Roll 4d6kh3 and you see all four dice with the discarded low one struck through, so nobody at the table can argue the arithmetic. A kept die that lands on its highest face turns green, a natural 1 goes red, and crits and fumbles jump out of the row without you having to scan it. It totals the kept dice and ignores the rest, so there's no mental math. Roll six times and you've got a full ability-score array, each set of four shown.

Tabletop rules describe rolls in a shorthand, and once it clicks almost any rulebook opens up. The core is NdX: N dice of X sides each. So 3d6 is three six-sided dice summed. Tack on +M or -M for a flat bonus or penalty. That covers most of what you'll ever type into the box.

Two extra tokens handle the rolls people ask about. Keep highest is kh, so 4d6kh3 rolls four d6 and keeps the best three, the standard way to roll a D&D ability score, and keep lowest is kl for the reverse. Advantage in fifth edition is just 2d20kh1, two d20 keeping the higher, and disadvantage is 2d20kl1. You can also drop instead of keep: 4d6dl1 throws out the lowest and lands on the same result as 4d6kh3. The presets load the common ones, but the notation lets you build anything.

Type this	You get	Range
1d20	one twenty-sided die	1 to 20
1d20+5	a d20 check with a +5 bonus	6 to 25
4d6kh3	four d6, keep the best three	3 to 18
2d20kh1	advantage, two d20 keep higher	1 to 20
8d6	a fireball's worth of d6	8 to 48

Under the notation box, the tool shows the lowest and highest your roll can land, plus the average, and it updates as you type. So 2d6+3 reads a range of 5 to 15 with an average of 10 before you commit to anything. That helps when you're weighing a build or deciding whether a flat bonus beats an extra die. When a roll uses keep or drop, the average is left off on purpose, because the honest math for "keep the best three of four" isn't a clean number the tool is willing to fake.

Those averages also explain why dice feel the way they do. A single d6 is flat, each face a clean one-in-six. Sum two dice and the shape bends. There are 36 equally likely results for 2d6 and they don't spread evenly: six of them add to 7 while only one adds to 2 and one to 12. So a 7 comes up six times as often as snake eyes, which is why Catan trades cluster around 6, 7, and 8. Add more dice and that hump gets steeper, the extremes rarer still.

One more thing people always ask about: is a virtual roll actually fair. Every result here comes from your browser's cryptographically secure random generator, with a step called rejection sampling that quietly discards the rare raw values that would otherwise make some faces a hair more common. Every face ends up exactly as likely as it should be, which honestly is more than a worn plastic d20 can promise. What it can't give you is the clatter of real dice on the table, so if that ritual is the whole point for your group, roll the real ones. For speed and a result you can actually check, this is the better call.