That depends on what the '8' are.
8 feet. . . . . 243.8 cm (rounded)
8 inches. . . . . 20.32 cm (rounded)
8 miles . . . 1,287,475 cm (rounded)
8 millimeters . . . . . 0.8 cm (rounded)
8 smoots . . . . . . 170.2 cm (rounded)
8 furlongs. . . 160,934 cm (rounded)
8 meters. . . . . . . 800 cm (rounded)
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