How to say "within" in Japanese

• うちJLPT N4approx.Common
  noun, adverbThe inside of something, such as a house or a room. It fits when English 'within' points to an interior or enclosed space rather than to a measured limit.
• 以内いないJLPT N4approx.Common
  noun, noun (suffix), adverbThe word for 'within' as a limit or bound: within a certain amount, distance, or period, or less than a stated figure. A natural choice when 'within' sets a limit.
  １週間しゅうかん以内いないに電話でんわします。↗

  I'll call you within a week.
• 中なかJLPT N5approx.Common
  noun, adverbA noun for the middle or inside of something, and for 'among' — as in one choice among several or a person within a group. Use it for these spatial or 'among' senses.
  これらの商品しょうひんの中なかから１つ選えらびなさい。↗

  Choose one from among these products.
• 中ちゅうJLPT N3approx.Common
  suffixRead as ちゅう, this covers 'in', 'within', and 'among', and it is the reading used for counting 'out of', as in three out of ten people.
  空気くうき中ちゅうのごく小ちいさい粒子りゅうしがガンのもとになり得うる。↗

  Tiny particles in the air can cause cancer.
• 中じゅうCommon
  suffixRead as じゅう, this is the 'within' of a time span: within the week, in the course of today, or by the end of a period. Choose it when 'within' sets a span or deadline.
  最終さいしゅう提案ていあんは来週らいしゅう中ちゅうに発表はっぴょうされます。↗

  The final proposal will be announced sometime next week.

Use 以内 when 'within' sets a limit of amount or time, 中（じゅう） for a period such as a week, 「うち」 or 中（なか） for an inside or 'among', and 中（ちゅう） for 'out of' a number.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• うちinside
• 以内いないwithin
• 這裏しゃりinside this
• 中なかamong
• 中ちゅうin
• 中じゅうwithin (e.g. the week)