90 in Japanese
九十
Updated May 2026
Ninety: kyu (not ku)
NUMERAL
90
KANJI
九十
HIRAGANA
きゅうじゅう
ROMAJI
kyū-jū
Build-by-place breakdown
Counter-attached forms
How 90 attaches to common counters. Each links to the per-counter deep-dive.
Real sentence examples
九十年代の音楽が好きです (kyū-jū-nendai no ongaku ga suki desu): I like music from the 1990s (nineties).
気温は九十度に近いです (kion wa kyū-jū-do ni chikai desu): the temperature is close to 90 degrees (Fahrenheit).
Pronunciation and morphology notes
Ninety always uses kyu in modern Japanese. The form ku-ju is archaic and would sound jarring in everyday speech. Kyu is the safer reading for almost all tens positions. The age 90 (kyū-jus-sai) has no specific cultural name in common use, though 99 has been called “hakuju” (白寿, "white longevity") because removing the top stroke of 百 (100) gives 白.
Related numbers
Browse the full reference or jump to a related section.