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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Rod calculus or rod calculation is the method of mathematical computation with counting rods in China from The Warring States to Ming dynasty before the counting rods were replaced by more convenient and faster abacus.The basic equipment for carrying out rod calculus is a bundle of counting rods and a counting board. The counting rods are usually made of bamboo sticks, about 12 cm- 15mm in length, 2mm to 4 mm diameter, sometimes from animal bones, or ivory and jade (for well heeled merchants). A counting board could be a table top, a wooden board with or without grid, on the floor or on sand.