Size Duel deck / Sport and everyday things
Football (size 5)
Length: diameter (from the 68–70 cm circumference)
22 cm (8.66 in)
Range used for fair duels: 21.6 cm to 22.3 cm.
The rules give the circumference; the diameter is that divided by π.
Sources and checks
Checked 2026-10-19: Claude (AI build agent): Wikidata statement compared, second-source quote verified in the fetched page. Quotes are short passages from each source.
Wikidata P2386: 21.96 centimetreQ12252328, CC0, retrieved 2026-10-19
“of a circumference of between 68 cm (27 ins) and 70 cm (28 ins)”IFAB Laws of the Game, Law 2: source, retrieved 2026-10-19, read with a web fetch
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