Roll a d2
A d2 is a two-sided die with results 1 and 2, so it works exactly like a coin flip: each side has a 50% chance and the average roll is 1.5. Real d2s are rare, so most players flip a coin or roll a d6 and read odd as 1 and even as 2. Press Roll below to roll.
Press Roll to roll.
d2 odds and average
Minimum 1, maximum 2, average 1.5. Every face has a 50% chance on a fair die.
| Roll | Chance of exactly this | Chance of this or higher |
|---|---|---|
| Heads (1) | 50% | 100% |
| Tails (2) | 50% | 50% |
How to roll a d2 and when you need one
Fake it with another die: Roll a d6 and treat odd numbers (1, 3, 5) as 1 and even numbers (2, 4, 6) as 2. A d4 works too: 1–2 counts as 1 and 3–4 counts as 2. Both methods keep the odds at exactly 50/50. A coin also works, with heads as 1 and tails as 2.
Random choices at the table: A d2 settles any either-or question fast. Which of two doors the monster went through, whether a nervous NPC lies or tells the truth, which of two players a confused creature targets, or whether the weather turns. It keeps the DM from picking favorites.
Tables and homebrew: The official D&D rules almost never call for a d2, but some adventures, random tables and homebrew rules use it for simple splits, and you can build a d2 into your own encounter or loot tables. For bigger choices, step up to a d3 or a d4.
Roll a d2 FAQ
Is a d2 the same as a coin flip?
Yes. A fair d2 and a fair coin both have two outcomes with a 50% chance each. This roller labels 1 as Heads and 2 as Tails so you can use it either way.
How do you roll a d2 with a d6?
Roll the d6 and read odd results as 1 and even results as 2. Three of the six faces lead to each result, so both are equally likely.
Do d2 dice exist?
Yes, though they are uncommon. Some are shaped like thick coins and others are d6s marked with 1 and 2 three times each. Most players just flip a coin or use another die.
What is the average roll on a d2?
The average roll on a d2 is 1.5, because (1 + 2) / 2 = 1.5.
Related
Other dice
- 3D Dice Roller
- Roll a d3
- Roll a d4
- Roll a d6
- Roll a d8
- Roll a d10
- Roll a d12
- Roll a d20
- Roll a d100
- Roll a d1000
About this roller
DnD Dice Roller (dnddiceroller.org) rolls every die with your browser's cryptographically secure random number generator, crypto.getRandomValues, and uses rejection sampling so every face is exactly equally likely. The 3D dice only animate a result that has already been decided this way; the physics never picks the number. Rolls happen on your device and are never sent to our server.
The site is built and maintained by Farooq Choudhary at Ozeito, which also publishes the DnD Dice Roller app for Android and iOS. Found a problem? Contact us.
Wizards of the Coast LLC is the trademark holder for Dungeons & Dragons, Wizards of the Coast, and their respective logos worldwide.
Wizards of the Coast LLC does not support, endorse, approve, or have any affiliation with DnD Dice Roller. According to the Wizards of the Coast LLC's Fan Site Policy, DnD Dice Roller may use its trademarks and other intellectual property. Please visit Wizards of the Coast's website at www.wizards.com if you want additional information about the company, its trademarks, or other intellectual property.
Contains content from the System Reference Document 5.1 and 5.2 by Wizards of the Coast LLC, used under the Creative Commons Attribution 4.0 International License.