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Could anyone help me with this translation? I think once per week is "shuu ichi" but with days in particular I really don't remember how to say it.

Al3ppi
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1 Answers1

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The most generic and useful pattern is number + counter + に + number + 回/度.

  • 2年に1回 once in two years
  • 6週間に1回 once in six weeks
  • [1月]{ひとつき}に3回 ／ [1か月]{いっかげつ}に3回 three times a month
  • 1年に2回 twice a year
  • [1日]{いちにち}に3回 three times a day
  • [2日]{ふつか}に3回 three times in two days

There are some irregular readings when referring to a time span. See the last part of this page.

You can also say 日【ひ】にn回, 週(に)n回, 月【つき】(に)n回, 年(に)n回 (but not 時間n回, 日n回, 週間n回, etc).

  • 1週間に5回バイトをする = 週(に)5回バイトをする to work part-time five days a week
  • 年(に)1度の総会 the annual general meeting

週一【しゅういち】 is a bit slangy and colloquial phrase that means 1週間に1回 (once a week). You can also say 週一【しゅういち】 ～ 週七【しゅうなな】, 月一【つきいち】, 年一【ねんいち】. (But 月三/年四/etc are rare and you should usually say 月に3回/年4回 instead)

  • 週七【しゅうなな】でバイトをする to work part-time seven days a week
  • 月一【つきいち】のミーティング monthly meeting

In addition, there are 隔日【かくじつ】, 隔週【かくしゅう】, 隔月【かくげつ】, 隔年【かくねん】 which mean "every other ～".

隔週のミーティング biweekly meeting

naruto
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  • does the use of かくしゅう ever pose an ambiguity problem for native speakers (隔週、各週) – virmaior Jul 30 '16 at 09:28
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    隔週 is [かくしゅう]{LHHHH} while 各週 is [かくしゅう]{HLLLL}, and 各週 is very rarely used IMO (we use 毎週). – naruto Jul 30 '16 at 09:34
  • Thanks, that's very helpful. I'll take it as a species of grammatical overgeneralization I've committed as a foreigner then (not to be outdone by the span nearly a decade ago where I way saying [今年]{コンネン}) – virmaior Jul 30 '16 at 09:47
  • @naruto You made your response so awesome that you forgot to answer the question. How would you say "once every x days/weeks/etc" ? – oldergod Aug 01 '16 at 02:07
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    @oldergod I think the first part answer the question. x年に1回 / x週に1回 will do. – naruto Aug 01 '16 at 02:30