Number to Words Converter

How this converter works

Type any whole number or decimal, and this tool spells it out in written English words. Turn on "Format as currency" to get a check-writing style result, like "One thousand two hundred thirty-four and 56/100," with cents shown as a fraction the way banks expect.

What is this used for?

Writing numbers in words is required when filling out checks (US banks generally treat the written-word amount as the legally binding one if it conflicts with the numeric box), and it's common on legal documents, contracts, deeds, and invoices specifically to avoid ambiguity or after-the-fact tampering with a numeral. It's also used in formal writing many style guides (like AP and Chicago) call for spelling out numbers under 10 or 100 in regular prose and by screen readers and text-to-speech tools that need a written-word form to read numbers naturally aloud.

How large numbers get their names

English number names follow the short scale, where each new name is 1,000 times the last: thousand (10³), million (10&sup6;), billion (10&sup9;), trillion (10¹2;), and so on. This differs from the long scale still used in some European countries, where "billion" historically meant a million million (10¹2;) rather than a thousand million a common source of translation mix-ups in international finance and news.

FAQ

What's the largest number this supports?
This tool supports numbers up to the trillions. Extremely large numbers (quadrillions and beyond) fall outside its range since they rarely come up in everyday checks, invoices, or legal documents.

Does it handle negative numbers?
Yes a negative number is spelled out with "negative" at the start, for example "negative forty-two."

How does it handle decimals that aren't money?
Without the currency toggle turned on, a decimal like 12.5 is read out digit by digit after the decimal point (e.g., "twelve point five"), matching how decimals are normally spoken aloud, rather than as a cents fraction.

Why do banks require the amount in words on a check?
The written-word amount is harder to alter than a numeral (you can't easily turn "forty" into "forty-eight" the way you could change "40" to "48"), and US banking practice treats the written amount as controlling if it doesn't match the numeric box.

Can I use this for legal contracts that need numbers spelled out?
Yes, this is a common contract-drafting convention writing "Ten Thousand Dollars ($10,000.00)" so the numeral and words confirm each other. Always double-check the generated text against the source figure before using it in a signed document.

Does this work for numbers in other languages?
No this tool spells numbers out in English only. Number-to-words rules (including where "and" is used, and how large numbers are grouped) vary significantly between languages.