# Dice Expressions

MapTool's chat window and macro system supports several of the most common dice expressions based on the formats **XdY** and **dY**.

In the tables below, the variable *Y* is described as the "number of sides" on the dice being rolled; in reality the dice roller is picking a random number between 1 and *Y*. The end result is the same.

Additionally, in the expressions, capital letters signify an argument you must provide, while the lower-case letters are a fixed part of the dice expression. For example, in the expression **XdYsS**, you replace *X*, *Y*, and *S* with numbers to indicate the number of dice, how many sides the dice have, and what number indicates a success, respectively. The lower case "d" and "s" are left alone. Also, only one expression may be used at a time. For example, you could not combine the expressions of dropping low dice and keeping high dice.

Finally, note that when entering a dice roll directly in chat, you need to use the /roll Chat Command to execute the roll. In a macro, you would enclose the roll expression in square brackets. For example, if you wanted to roll one twenty sided die, one six sided die, and add 8 to the result:

*Directly in chat*:

/roll 1d20+1d6+8

*In a macro*:

[1d20+1d6+8]

You may also access these dice expressions directly using macro functions, see Category:Dice Function.

## General Dice Expressions

Expression | Operation | Description | Example | Macro Function |
---|---|---|---|---|

XdY |
Roll X dice with Y sides each. If X is not included, roll 1 die with Y sides and present the sum of all rolls in chat |
/roll 1d20 rolls one twenty-sided die and presents the total roll in chat |
roll() | |

XdYdN |
drop | Roll X dice with Y sides each, and drop the lowest N dice afterwards |
/roll 4d6d1 rolls four six-sided dice, drops the lowest roll, and presents the total in the chat window |
drop() |

XdYkN |
keep | Roll X dice with Y sides each, and keep the highest N dice afterwards |
/roll 4d6k3 rolls four six-sided dice, keeps the highest 3 rolls, and presents the total in the chat window |
keep() |

XdYrL |
reroll | Roll X dice with Y sides each, repeatedly rerolling any results lower than L |
/roll 3d8r2 rolls three eight-sided dice, repeatedly rerolls any dice that are lower than 2 until all dice rolls are higher than or equal to 2, and then sums and presents the total in chat |
reroll() |

XdYrkL |
reroll once & keep | Roll X dice with Y sides each, rerolling any results lower than L and keeping the new values |
/roll 2d6rk3 rolls two six-sided dice, rerolling (once) any dice that are lower than 3, and presents the total in chat |
rerollOnce() |

XdYrcL |
reroll once & choose | Roll X dice with Y sides each, rerolling any results lower than L and choosing the higher values |
/roll 2d6rc3 rolls two six-sided dice, rerolling (once) any dice that are lower than 3 but choosing the higher of the two results, and presents the total in chat |
rerollOnce() |

XdYsT |
success | Roll X dice with Y sides each, and count any rolls that meet or exceed T (the "target number") |
/roll 4d6s4 rolls four six-sided dice, and counts any individual roll that exceeds four, presenting the number of "successes" in chat |
success() |

XdYe |
explode | Roll X dice with Y sides each, and reroll any dice that roll Y, add the new roll to the total |
/roll 2d6e rolls two six-sided dice, and if either rolls a 6, it is rerolled and added to the total (this continues until neither die rolls a 6). |
explode() |

XdYesT |
exploding success | As success rolls, above, but the individual dice can "explode" (i.e., they are rerolled if they roll their maximum value) |
/roll 4d6es8 will roll 4 six-sided dice, explode any that roll their maximum, and then total the rolls that exceed 8 |
explodingSuccess() |

XdYo |
open | Roll X dice with Y sides each, and explode any dice that roll Y, then return the value of all rolls, as well as the highest roll |
/roll 5d6o rolls 5 six-sided dice, and explodes any that roll 6 |
openTest() |

XdYdhZ |
drop high | Roll X dice of Y sides, and drop the Z highest |
/roll 5d10dh2 rolls five ten-sided dice, drops the two highest, and presents the total in the chat window |
dropHighest() |

XdYklZ |
keep low | Roll X dice of Y sides, and keep the Z lowest |
/roll 5d6kl3 rolls five six-sided dice, keeping the three lowest, and presents the total in the chat window |
keepLowest() |

XdYuZ |
upper bound | Roll X dice of Y sides, with an upper bound of Z for each roll. |
/roll 5d6u4 rolls five six-sided dice, replacing any results higher than 4 with 4, and presents the total in the chat window |
rollWithUpper() |

XdYlZ |
lower bound | Roll X dice of Y sides, with a lower bound of Z for each roll. |
/roll 5d6l2 rolls five six-sided dice, replacing any results lower than 2 with 2, and presents the total in the chat window |
rollWithLower() |

XdYaZuW |
add, upper bound | Roll X dice of Y sides, add Z to each roll. Apply an upper bound of W to each result. |
/roll 5d6a1u6 rolls five six-sided dice, adding 1 to each, replacing intermediate results higher than 6 with 6, and presents the total in the chat window |
rollAddWithUpper() |

XdYaZlW |
add, lower bound | Roll X dice of Y sides, add Z to each roll. Apply a lower bound of W to each result. |
/roll 5d6a1l3 rolls five six-sided dice, adding 1 to each, replacing intermediate results lower than 3 with 3, and presents the total in the chat window |
rollAddWithLower() |

XdYsZuW |
subtract, upper bound | Roll X dice of Y sides, subtract Z from each roll. Apply an upper bound of W to each result. |
/roll 5d6s1u4 rolls five six-sided dice, subtracting 1 from each, replacing intermediate results higher than 4 with 4, and presents the total in the chat window |
rollSubWithUpper() |

XdYsZlW |
subtract, lower bound | Roll X dice of Y sides, subtract Z from each roll. Apply a lower bound of W to each result. |
/roll 5d6s1l2 rolls five six-sided dice, subtracting 1 from each, replacing intermediate results lower than 2 with 2, and presents the total in the chat window |
rollSubWithLower() |

## Game-Specific Dice Expressions

Expression | Game System | Operation | Description | Macro Function |
---|---|---|---|---|

XdYh |
Hero | Stun Dice | Rolls X dice with Y sides each, keeping track of the results for hero rolls for body damage. Where a roll of 1 = 0 body damage, a roll of Y = 2 body damage and a roll in between these two values = 1 body damage. |
hero() |

XdYb |
Hero | Body Dice | Returns the body damage from the last XdYb Hero Stun Dice roll as long as X and Y matches the Stun Dice roll |
herobody() |

Xdf |
Fudge | Fudge Dice | Rolls X Fudge dice (which return -1, 0, or 1), summing the dice and returning the sum |
fudge() |

Xdu |
Ubiquity | Ubiquity Dice | Rolls X Ubiquity dice, which return 0 or 1, summing the result and returning that value to chat |
ubiquity() |

Xsr4 |
Shadowrun 4th Ed. | Shadowrun Basic Roll | Roll X number of 6 sided dice. Output the number of Hits (Rolls 5 or above) and the numbers of Ones rolled. If the number of Ones is half or more of X, display Glitch. If the number of Ones is half or more of X and there are no Hits, display Critical Glitch. |
sr4() |

Xsr4gT |
Shadowrun 4th Ed. | Shadowrun Gremlin Roll | Roll X number of 6 sided dice. Output the number of Hits (Rolls 5 or above) and the numbers of Ones rolled. If the number of Ones is half or more of X minus T, display Glitch. If the number of Ones is half or more of X minus Y and there are no Hits, display Critical Glitch. |
sr4() |

Xsr4e |
Shadowrun 4th Ed. | Shadowrun Exploding Roll | Roll X number of 6 sided dice. Output the number of Hits (Rolls 5 or above) and the numbers of Ones rolled. Reroll any 6 adding it to the pool. If the number of Ones is half or more of X, display Glitch. If the number of Ones is half or more of X and there are no Hits, display Critical Glitch. |
sr4e() |

Xsr4egT |
Shadowrun 4th Ed. | Shadowrun Exploding Gremlin Roll | Roll X number of 6 sided dice. Output the number of Hits (Rolls 5 or above) and the numbers of Ones rolled. Reroll any 6 adding it to the pool. If the number of Ones is half or more of X minus T, display Glitch. If the number of Ones is half or more of X minus T and there are no Hits, display Critical Glitch. |
sr4e() |

XdYq#+Z |
DragonQuest | - | Rolls X dice of Y sides, adding Z to each die, summing the result and returning that value to chat |
rollAddWithLower() |

XdYq#-Z |
DragonQuest | - | Rolls X dice of Y sides, subtracting Z from each die with a minimum of 1, summing the result and returning that value to chat |
rollSubWithLower() |