Law 5 of the official MCC Rules of Cricket states: The ball, when new, shall weigh not less than five and a half ounces (155.9 grams) nor more than five and three quarter ounces (163 grams), and shall measure not less than eight and thirteen sixteenths inches (22.4 cm), nor more than nine inches (22.9 cm) in circumference. The diameter can be found by dividing the circumference by pi, 3.141593.
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The diameter of the Cricket Ground varies between 450 feet (137 m) to 500 feet (150 m).
The ball is a hard leather-seamed spheroid with a circumference of 9 inches (230 mm).