Play free Calculation Solitaire online. While Calculation has the usual goal of arranging the entire contents of the deck in four stacks of thirteen cards, the suits of the cards in these stacks is irrelevant. Instead, the four stacks accept cards whose ranks differ by a specified interval. Even though the computer calculates the accepted sequences of cards, the game is still extremely challenging. For more help, use the button within the game, or click here for Calculation Solitaire help.