Learn how to roll d66 with one die, two matching dice, or two different-colored six-sided dice for Traveller RPG tables and other sci-fi RPG tools.
What Is d66?
d66 is a simple way to generate 36 possible results using regular six-sided dice. It is often used for random tables in Traveller RPG and other tabletop roleplaying games.
A d66 result is not the same as adding two dice together. Instead, you read one die as the tens digit and the other die as the ones digit. For example, a 3 followed by a 2 gives a result of 32. A 6 followed by a 3 gives a result of 63.
This makes d66 useful for random names, patron encounters, rumors, complications, NPC traits, cargo details, mission prompts, and other referee tools.
Watch: Roll d66 Perfectly With Just Regular Dice
If you are new to d66 rolls, this video shows how to use regular six-sided dice to generate d66 results for Traveller RPG random tables.
3 Easy Ways To Roll d66 Using Regular 6-Sided Dice
You do not need special dice to roll d66. You can use one normal six-sided die, two dice of the same color, or two dice of different colors.
Method 1: Roll d66 Using 1 Die
Use one six-sided die and roll it twice.
The first roll is the tens digit. The second roll is the ones digit.
For example, if you roll a 3 and then roll a 2, your d66 result is 32.
This method is useful if you only have one die available, but it is slightly slower because you need to roll twice and remember which roll came first.
Method 2: Roll d66 Using 2 Dice Of The Same Color
Use two six-sided dice of the same color. Roll both dice together, then decide how to read them consistently.
The easiest option is to read the leftmost die as the tens digit and the rightmost die as the ones digit.
For example, if the left die shows 1 and the right die shows 4, your d66 result is 14.
This method works well at the table, but make sure everyone knows which die is being read first.
Method 3: Roll d66 Using 2 Dice Of Different Colors
Use two six-sided dice of different colors. Before you roll, choose one color as the tens digit and the other color as the ones digit.
For example, you might decide that the red die is the tens digit and the blue die is the ones digit. If the red die shows 6 and the blue die shows 3, your d66 result is 63.
This is usually the clearest method because the dice colors tell you how to read the result.
d66 Examples
Here are a few sample d66 results:
| First Die | Second Die | d66 Result |
|---|---|---|
| 1 | 1 | 11 |
| 2 | 5 | 25 |
| 3 | 6 | 36 |
| 4 | 2 | 42 |
| 5 | 4 | 54 |
| 6 | 6 | 66 |
The possible d66 results run from 11 to 66. There are 36 possible results total.
Why Use d66 Tables?
d66 tables are popular because they are compact, fast, and easy to use. A d66 table gives the referee more variety than a short six-entry table without requiring unusual dice or complicated math.
Traveller referees can use d66 tables during prep or live play for:
- NPC names
- Patron ideas
- Rumors
- Starport encounters
- Mission complications
- Shipboard problems
- Trade details
- Worldbuilding prompts
- Quick character traits
- Improvised scene details
A good d66 table gives the referee a useful prompt without forcing the session in only one direction.
Roll d66 Online
If you do not have dice nearby, you can use the online d66 dice roller instead.
The online roller is useful during digital prep, virtual tabletop sessions, solo play, and quick referee work when you just need a result immediately.
Where To Get d66 Tables
You can browse d66-related material on CyborgPrime by searching for d66 tables.
You can also browse CyborgPrime RPG products on DriveThruRPG for sci-fi RPG tools, random tables, maps, and referee resources.
For more Traveller RPG articles and utilities, visit the CyborgPrime Traveller RPG Blog.
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