The official size of a soccer ball is not more than 70 centimeters (27 inches) in circumference and not less than 68 centimeters (26 inches) in circumference. And in case a question arises regarding the metric units not being the exact equivalent of the standard or English units (or vice versa), refer the inquiring individual to the Federation Internationale de Football Association (FIFA), the world governing body of soccer and the ultimate authority on the game and its rules. The dimensions are right out of the official Laws of the Game that they publish.
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The answer should be around 68.83185 fluctuating by the inflation of the soccer ball.
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Official FIFA soccer balls must be inflated to 12.5-13.5 pounds per square inch.(PSI).
There need not be any. The official ball for the 2014 World Cup in Brazil, called the Brazuca, was made from six rounded cross-shaped pieces.