Related words 完かん 全ぜん 完全 means 'perfect' or 'complete' in a more formal, absolute sense, while 100% is a casual, numerical way to express totality.
全ぜん 部ぶ 全部 means 'all' or 'everything' and is used for countable or collective items, whereas 100% emphasizes the degree or proportion.
Written forms 100ひゃくぱーせんと %
Standard modern spelling using Arabic numerals and percent sign.
100パーセントひゃくぱーせんと
Mixed numeral-katakana spelling, also common.
百ひゃく パーセント
Kanji-katakana spelling, less common but still used.
Etymology Loanword from English '100 percent', adapted into Japanese as ひゃくパーセント . The numeral and percent sign are standard in modern writing.
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