Ball math
A match ball’s weight is only specified at the start of the match.
68–70 cm · 410–450 g
The Laws allow a circumference of 68–70 cm and a weight of 410–450 g — measured at the start of the match.
Standard range
Why this is interesting
The rule for the ball is a pair of ranges, and one of them has a time stamp.
How this measurement works
Law 2 of the Laws of the Game requires a ball with a circumference of 68 to 70 cm, and a weight of 410 to 450 g at the start of the match.
The Laws give ranges, not a single size, and they fix the weight at kick-off rather than for the whole game.
How certain is this?
Standard range — permitted minimum and maximum values.
Both figures are permitted ranges from Law 2; no diameter or midpoint is implied.
Sources & further reading
International Football Association Board
Laws of the Game(opens external site)
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