100000000 in Japanese
一億
Updated May 2026
A hundred million: 1 oku, the next major unit
NUMERAL
100,000,000
KANJI
一億
HIRAGANA
いちおく
ROMAJI
ichi-oku
Real sentence examples
日本の人口は約一億二千万人です (nihon no jinkou wa yaku ichi-oku ni-sen-man-nin desu): Japan's population is around 120 million.
一億円の宝くじが当たったらどうしますか (ichi-oku-en no takarakuji ga atattara dou shimasu ka): what would you do if you won the 100 million yen lottery?
Pronunciation and morphology notes
A hundred million in Japanese is ichi-oku (one oku), the next major unit after man. One oku = 10,000 x 10,000 = 100,000,000 (100 million in English). The Japanese government publishes budgets in oku and cho natively; the budget for the 2024 fiscal year was approximately 112 cho yen. For English-speakers, sliding from 3-digit to 4-digit comma groupings is the key mental shift to read Japanese big numbers fluently.
Related numbers
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