ArkhamCalc is a small utility that is designed to be used in conjunction with Arkham Horror, a 2005 board game published by Fantasy Flight Games. Many of the encounters in Arkham Horror involve rolling a number of dice and counting each success, which in most cases require rolling a five or six. Given the number of dice that you are allowed to roll and the number of "successes" required to pass the encounter, ArkhamCalc calculates the probability of succeeding in the encounter. ArkhamCalc can also take game conditions into account, such as being "blessed" or "cursed", which affect the probabilities of success beyond the standard calculation.ArkhamCalc is open-source and distributed under the GNU GPL v2 license. It is hosted on Google Code; visit https://code.google.com/p/arkham-calc/ for more information.Icon adapted from Arkahm Horror Dice Set.