Write a large number in English words (and Japanese)

Checks, contracts, and formal writing spell numbers out. Convert any whole number to words in both languages at once.

Tools used in this guide

The job

A contract clause says "an amount not exceeding ___" or a check needs the amount in words. Spelling 2,345,678 out by hand invites mistakes, and checking a translated figure needs both languages.

Worked example

Enter 1234: English gives "one thousand two hundred thirty-four", Japanese gives "千二百三十四". Enter -50,000,000 for a negative: "minus fifty million" / "マイナス五千万".

English uses the short scale (thousand, million, billion, trillion, quadrillion) — the standard in the US, UK, and international business.
Japanese omits the leading 一 before 十・百・千 as in standard writing: 千二百, not 一千二百.
Whole numbers only, up to 15 digits. For Roman numerals or other bases, use the related tools.

Where spelling matters

Amounts on checks and invoices (words prevent tampering with digits), legal thresholds written both ways ("one hundred (100)"), and accessibility text where digits read awkwardly aloud.