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.

  • 1
    Are you looking for おき and ごと. Check those words and how they are used.
    – oldergod
    Commented Jul 30, 2016 at 5:57
  • ^ But "once a week" "twice a week" "once a day" "twice a day" etc. cannot be expressed with おき or ごと, right?
    – chocolate
    Commented Jul 30, 2016 at 7:00
  • @chocolate the OP is not asking for twice a day. Check the title: "once every x days/weeks/etc"
    – oldergod
    Commented Aug 1, 2016 at 2:05

1 Answer 1


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

  • does the use of かくしゅう ever pose an ambiguity problem for native speakers (隔週、各週)
    – virmaior
    Commented Jul 30, 2016 at 9:28
  • 2
    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
    Commented Jul 30, 2016 at 9:34
  • 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
    Commented Jul 30, 2016 at 9:47
  • @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
    Commented Aug 1, 2016 at 2:07
  • 2
    @oldergod I think the first part answer the question. x年に1回 / x週に1回 will do.
    – naruto
    Commented Aug 1, 2016 at 2:30

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