Mondo Knows Facts
A judo mat measures 10 metres square
The contest area is bounded by a red zone of about one metre The fighting area is 8 metres square inside a red danger area, with a further safety margin outside that. A fighter who steps into the red zone without attacking risks a penalty. The mats themselves are foam-filled and covered in a textured vinyl surface. It sits in Mondo's sports collection, one of 200 facts that each trace back to the reference below.
Where this comes from
Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.
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Judo belts mark rank from white to blackThere are six student grades below the first black belt in most countriesOlympic judo has seven weight classesMen and women each contest seven divisions, plus a mixed team eventJudo was founded in Tokyo in 1882Jigoro Kano built it from jujitsu techniques he had studied as a young manAn ippon ends a judo contest at onceA clean throw onto the back, a 20-second pin or a submission all score itA wrestling mat has a 9-metre circleThe mat is 12 metres square, with the contest held inside the inner circleA table tennis ball is 40 millimetres acrossThe size went up from 38 millimetres in 2000 to slow the game slightly
🏅 Sportsfact 128 of 200
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Tags: judo, tatami, measurement
A judo mat measures 10 metres square: the short answers
- Where does this come from, and can I check it?
- The contest area is bounded by a red zone of about one metre. The figure is taken from International Judo Federation, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
- Is this really a sports fact?
- Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
- What else can I read about it?
- The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.