Japanese Number Converter
Convert whole numbers between Arabic digits and Japanese numerals, with kanji, kana, and romaji readings for prices, quantities, and travel details.
Kanji
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- Arabic digits
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- Kanji
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- Hiragana
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- Romaji
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iPhone & iPad · Free
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How Japanese number conversion works
Japanese whole numbers group digits in units of four. 万 is 10,000, 億 is 100,000,000, and 兆 is 1,000,000,000,000. Within each group, 十, 百, and 千 mark tens, hundreds, and thousands.
Enter Arabic digits or a standard kanji numeral. The converter composes or parses the place values locally, then shows kanji, a hiragana reading, and Hepburn-style romaji. It uses common standalone readings such as よん for four and なな for seven.
Some sounds change when numbers combine: 300 is さんびゃく, 600 is ろっぴゃく, 800 is はっぴゃく, 3,000 is さんぜん, and 8,000 is はっせん. Counters can introduce additional reading changes, so the result is the number by itself rather than a complete counted phrase.
value = 兆 group × 10¹² + 億 group × 10⁸ + 万 group × 10⁴ + final group This converter accepts non-negative whole numbers through 999,999,999,999,999. Japanese-to-digits input uses kanji numerals; remove currency symbols and counters first.
Frequently asked questions
How do Japanese large numbers differ from English?
Japanese groups large values by ten-thousands. 一万 is 10,000, 一億 is 100 million, and 一兆 is one trillion.
Can I convert Japanese kanji numbers back to digits?
Yes. Enter a standard kanji numeral such as 三千五百 and the converter returns 3,500 along with its readings.
Why does 300 sound different from three plus hundred?
Regular sound changes make 300 さんびゃく rather than さんひゃく. Similar changes occur at 600, 800, 3,000, and 8,000.
Does the converter include counters such as 人 or 枚?
No. It reads the number alone. Japanese counters have their own pronunciations and can change the reading of the number.
Which readings does it use for four and seven?
The standalone output uses よん (yon) and なな (nana). Other readings can occur in fixed expressions, dates, and counter phrases.