How to say "dimensions" in Japanese

• 広さひろさJLPT N2approx.Common
  nounCovers 'dimensions' in the sense of area or extent — how much space a place covers. Natural when talking about the dimensions of a room, garden, or plot of land, where spaciousness is what matters.
  この家いえの広ひろさはどのくらいありますか。↗

  What is the area of this house?
• 大きさおおきさCommon
  nounCovers 'dimensions' as size: how large an object is, including its volume. The natural choice for the dimensions of a box or a piece of furniture, when you simply mean how big it is.
  その運河うんがは150,000重じゅう量りょうトンの大おおきさの船ふねを収容しゅうようできる。↗

  The canal can accommodate ships as large as 150,000 dead weight tons.

Use 「広さ」 when 'dimensions' means the area or extent of a space, and 「大きさ」 when it means how large an object is — its overall size or volume.

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

• 広さひろさarea
• 大きさおおきさsize