What it means
さ turns an adjective into a noun that expresses a quality, degree, or state, similar to “-ness” or “-ity” in English. It commonly describes measurable or noticeable qualities, such as height, weight, kindness, or quietness. With an い-adjective, remove the final い before adding さ. With a な-adjective, add さ directly to the adjective stem. The resulting noun can be used with particles and in both familiar and polite sentences.
Usage note
さ is mainly used with adjectives, not ordinary nouns. Do not confuse it with み, which often refers to a felt or experienced aspect of a quality and is less freely formed.
How to use it
この町の静かさは大きな魅力です。
The quietness of this town is a great attraction.
山の高さは予想以上です。
The mountain's height is greater than expected.
この町の静かさは大きな魅力だ。
The quietness of this town is a great attraction.
山の高さは予想以上だ。
The mountain's height is greater than expected.
Example sentences
この棚の高さは、私の目の高さにちょうど合っています。
The height of this shelf is just right for the height of my eyes.
この図書館の静かさのおかげで、試験の勉強に集中できます。
Thanks to the quietness of this library, I can concentrate on studying for the exam.
このかばんの軽さは、旅行のときにとても便利です。
The lightness of this bag is very convenient when traveling.