How to say "length" in Japanese

• レングスCommon
  nounThe borrowed English word, found mostly in technical and fashion jargon; for everyday statements about how long something is, 長さ is the natural choice.
• 体長たいちょうCommon
  nounThe length of an animal's body. Use it when giving a creature's measurements — the figure quoted for a fish, a snake, or an insect.
• 奥行きおくゆきCommon
  nounDepth, the front-to-back dimension of a room, shelf, or box. It appears under 'length' only because English sometimes calls that same dimension the length; it is not a general word for length.
  間口まぐちも広ひろいが奥行おくゆきも同様どうように深ぶかい。↗

  It's as deep as it is wide.
• 長さながさCommon
  nounThe general word for length: how long something is, in whatever dimension or measure. When no specialized sense applies — an animal's body, a garment, a room's depth — this is the default choice.
  ＡはＢの５倍ばいの長ながさがある。↗

  A is 5 times as long as B.
• 丈たけJLPT N1approx.Common
  nounLength in the clothing sense: how long a garment is — where a skirt or coat ends. Choose it for garment measurements and hemlines, not for length in general.
  丈たけの長ながいコートは、ほとんどくるぶしまで届とどいていた。↗

  He was wearing a long black coat that reached almost to his ankles.

Use 「長さ」 as the default word for length; 体長 for an animal's body length, 丈 for garment length, 「奥行き」 only for the front-to-back dimension, and 「レングス」 as a loanword in technical or fashion jargon.

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

• レングスlength
• 体長たいちょうlength (of an animal)
• 奥行きおくゆきdepth
• 長さながさlength
• 身丈みたけlength (of clothing)
• 伏長ふせながgoing (e.g. of a flight of stairs)
• 長短ちょうたん(relative) length
• 丈たけlength (esp. of clothing)
• 縦たてfront-to-back
• 尺しゃくlength
• 寸すんlength
• 尺度しゃくどlength
• 丈じょうlength
• 延長えんちょう(total) length
• 方ほうlength (of each side of a square)