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 T 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.

General Dice Expressions

Expression	Function	Description	Example
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
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
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
XdYrL	reroll	Roll X dice with Y sides each, rerolling any results lower than L	/roll 3d8r2 rolls three eight-sided dice, rerolls any dice that are lower than 3, and then sums and presents the total in chat
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
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).
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
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

Game-Specific Dice Expressions

Expression	Game System	Function	Description
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.
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
Xdf	Fudge	Fudge Dice	Rolls X Fudge dice (which return -1, 0, or 1), summing the dice and returning the sum
Xdu	Ubiquity	Ubiquity Dice	Rolls X Ubiquity dice, which return 0 or 1, summing the result and returning that value to chat
Xsr4egT	Shadowrun 4th Ed.	Shadowrun Exploding Roll	Rolls X six-sided dice, exploding their value, and comparing the results to T to count successes. Additionally, the "g" lets the roll count glitches
Xsr4g4	Shadowrun 4th Ed.	Shadowrun Standard Roll	As above, but does not explode the dice rolls.