Where the d10 shows up
- Weapons. Heavy crossbow, glaive, halberd and pike deal 1d10, and so do the longsword, battleaxe and warhammer used two-handed.
- Cantrips. Fire Bolt and Eldritch Blast both deal 1d10, which is why they get cast every single turn.
- Hit dice. Fighters, paladins and rangers roll a d10 per level, or take the fixed 6.
- Percentile rolls. Two d10s make a d100: one for the tens, one for the units.
Why the 0 means 10
A d10 is numbered 0 to 9 so that a pair of them can read 00 to 99 for percentile rolls. On its own, the 0 counts as 10. The roller above does that for you and draws the die exactly as it is marked.
Your odds on a d10
Every face of a fair d10 is 1 in 10, exactly 10%. For a number or higher:
| You need | Chance |
|---|---|
| 2 or higher | 90% |
| 4 or higher | 70% |
| 6 or higher | 50% |
| 8 or higher | 30% |
| 10 | 10% |
Waiting for a 10? The chance of at least one climbs with every roll:
| Rolls | At least one 10 |
|---|---|
| 1 | 10% |
| 3 | 27.1% |
| 5 | 41.0% |
| 7 | 52.2% |
| 10 | 65.1% |
| 20 | 87.8% |
Two d10s add up to 2 through 20, and 11 is the likeliest total, 1 in 10. The dice calculator works out any roll, and the d8 and d12 rollers sit either side.
Spells that roll 1d10
Base damage in the SRD, before upcasting or cantrip levels.
- Eldritch Blast (cantrip)
- Fire Bolt (cantrip)
Questions
What does 1d10 mean?
One ten-sided die. The number in front is how many dice, so 2d10 is two d10 added together, and 1d10 + 3 is a heavy crossbow hit with +3 Dexterity. The Dice Notation Guide covers the rest.
What is the average roll on a d10?
5.5, halfway between 1 and 10. Each extra d10 adds 5.5, so a Fire Bolt averages 5.5 damage and a critical hit with it (2d10) averages 11.
Does the 0 on a d10 mean 0 or 10?
On its own, 10. A d10 runs 0 to 9 so two of them can read a percentile roll from 00 to 99; when you roll one d10 for damage or a hit die, the 0 is a 10.
How do I roll a d100 with d10s?
Roll two d10s: one for the tens, one for the units. A 7 and a 3 reads 73, and 00 with a 0 reads 100. Or use the d100 roller, which does it in one tap.
How can I roll a d10 without one?
Roll a d20 and halve it, rounding up (1-2 is 1, 3-4 is 2, and so on). It stays perfectly fair. Or tap the roller above.
Is this d10 roller random and fair?
Yes. Each roll comes from your browser's cryptographic random number generator, with no bias towards any face. Every face is exactly 1 in 10. Roll up to 20 d10 at once and add a modifier.