Single die
Roll a d10
A 10-sided die, rolled in your browser. Every face has an equal 10.0% chance, which works out to 1 in 10.
The odds on a d10
A single die is flat: no total is more likely than any other. The curve only appears once you roll more than one, which is what the odds calculator is for.
- Lowest
- 1
- Highest
- 10
- Average
- 5.50
- Each face
- 10.0%
- Odds
- 1 in 10
Every bar the same height. That flatness is the whole point of a single die: 10.0% per face, no favourites.
What a d10 is for
Heavy crossbow and pike damage, percentile rolls in pairs, and sorcerer hit dice.
The die that comes in pairs
The d10 is the odd one out geometrically. It is not a Platonic solid at all but a pentagonal trapezohedron, ten kite shaped faces, which is why it looks different from everything else in the set and why it was a relatively late addition to dice bags.
Its real job is percentiles. Two d10s, one read as tens and one as units, give you a flat 1 to 100, which is why sets ship with a second d10 marked 00 to 90. That pairing is genuinely flat, unlike 2d10 added together, which is the mistake people make: summing two d10s gives you 2 to 20 with a hard peak at 11, not a uniform spread. If you want an even chance of any number, read them as digits. If you want a curve, add them. They are completely different tools and the same two dice do both.
See the d100 page for the flat version.
Hitting a target number
What a flat d10 beats, and how much two-dice advantage moves it.
| Need | Flat | Advantage | Disadvantage |
|---|---|---|---|
| 2+ | 90.0% | 99.0% | 81.0% |
| 3+ | 80.0% | 96.0% | 64.0% |
| 4+ | 70.0% | 91.0% | 49.0% |
| 5+ | 60.0% | 84.0% | 36.0% |
| 6+ | 50.0% | 75.0% | 25.0% |
| 7+ | 40.0% | 64.0% | 16.0% |
| 8+ | 30.0% | 51.0% | 9.00% |
| 9+ | 20.0% | 36.0% | 4.00% |
| 10+ | 10.0% | 19.0% | 1.00% |
How to use this roller
Tap the die or press the roll button. To roll several at once, change How many, and the chart above redraws to the distribution you are actually rolling. To add a bonus, put it in Modifier: entering 3 turns a d10 into 1d10+3. Negative numbers work for penalties. The keyboard shortcut is R. After a roll, Copy link gives you a URL that shows exactly that result to whoever opens it.
Nothing is stored on a server and no account is needed. The page works offline once loaded, which matters if the venue has poor signal.
Common questions about the d10
What are the odds of rolling a 10 on a d10?
The odds of rolling a 10 on a d10 are exactly 10.0%, or 1 in 10. Every face on a fair d10 is equally likely, so a 10 is no rarer than any other number.
Is 0 a 10 on a d10?
Yes. When a d10 is rolled on its own, the face marked 0 counts as 10, so the die runs 1 to 10. The exception is a percentile roll, where the d10 is the units die: there a 0 counts as 0, and 00 on the tens die with 0 on the units die is read as 100.
What is the difference between a d10 and a percentile die?
They are the same shape. A plain d10 is numbered 0 to 9 and read as 1 to 10. A percentile die is numbered 00, 10, 20 and so on up to 90, and only ever supplies the tens digit of a d100 roll. If you only have plain d10s, roll two of a different colour and decide in advance which one is the tens.
Is this d10 roller actually random?
Yes, this d10 roller uses cryptographic randomness. Every roll comes from the Web Crypto API rather than Math.random, with rejection sampling to discard values that would skew the result. A plain modulo of a random number is biased when the range does not divide evenly, which for a d10 would quietly favour the low faces.