Writing numbers out in words is required more often than you might think: on checks, legal contracts, invoices and formal invitations, in essays where style guides ask for spelled-out numbers, and in lessons on place value. The rules are simple but fiddly — hyphens between tens and ones, no “and” inside American whole numbers, and dozens of large-number names that few people remember. This converter spells out any number up to 999 vigintillion (66 digits), handles negatives and decimals exactly, and formats amounts for check writing.
How to use the numbers to words converter
- Type the number in Number. Commas, a leading minus sign, decimals and e-notation (such as 6.02e23) are all accepted.
- Choose the output in Write it as: cardinal words, check writing, dollars and cents, or ordinal words.
- For cardinal words, choose how decimals are read: “point five six” or “fifty-six hundredths.”
- Pick a Letter case if you need Title Case or UPPERCASE, and tick the British-style box to add “and” after hundred.
- The table at the bottom shows the same number in every format, and the steps show how each three-digit group was named.
How numbers are converted to words
English names numbers in groups of three digits. Each group is read as a number from 1 to 999 and followed by its scale word:
Within a group, hundreds come first, then the tens and ones, hyphenated from twenty-one to ninety-nine. Groups that are all zeros are skipped, so 1,000,005 is “one million five.” Because the converter works on the digits as text rather than as a floating-point number, even a 66-digit integer is spelled out exactly.
For decimals there are two conventions. Read digit by digit, 3.14 is “three point one four.” Read as a fraction, it is “three and fourteen hundredths,” where the denominator name depends on the number of decimal places: tenths, hundredths, thousandths, ten-thousandths and so on.
Worked example: $1,234.56
Groups: 1 | 234
1 → "one thousand"; 234 → "two hundred thirty-four"
Words: one thousand two hundred thirty-four point five six
Check: One thousand two hundred thirty-four and 56/100 dollars
Dollars and cents: one thousand two hundred thirty-four dollars and fifty-six cents
If an amount has more than two decimal places, it is rounded to the nearest cent first, so $12.995 is written “Thirteen and 00/100 dollars.”
Large number names (US short scale)
| Name | Power of ten | Zeros |
|---|---|---|
| thousand | 10³ | 3 |
| million | 10⁶ | 6 |
| billion | 10⁹ | 9 |
| trillion | 10¹² | 12 |
| quadrillion | 10¹⁵ | 15 |
| quintillion | 10¹⁸ | 18 |
| sextillion | 10²¹ | 21 |
| septillion | 10²⁴ | 24 |
| octillion | 10²⁷ | 27 |
| nonillion | 10³⁰ | 30 |
| decillion | 10³³ | 33 |
| vigintillion | 10⁶³ | 63 |
Between decillion and vigintillion come undecillion, duodecillion, tredecillion, quattuordecillion, quindecillion, sexdecillion, septendecillion, octodecillion and novemdecillion. Older British usage followed a long scale, where a billion meant a million million, but the UK government and media have used the short scale since 1974.
Check-writing tips
- Start the words at the far left of the line so nothing can be added in front.
- Capitalize the first word and write cents as a fraction over 100, even when they are zero (“and 00/100”).
- Draw a line from the end of the words to the word “Dollars” printed on the check.
- Make sure the written amount matches the numeric box; banks generally treat the words as the legal amount if the two disagree.
To go the other direction, from words back to digits, use the word form to standard form calculator. To keep a running register of the checks you write, try the checkbook calculator, and for other ways to write numbers, see the Roman numeral converter.
Frequently asked questions
How do I write a check amount in words?
Write the dollars in words, then "and," then the cents as a fraction of 100, then "dollars." $1,234.56 becomes "One thousand two hundred thirty-four and 56/100 dollars." Start at the far left of the line and draw a line through any empty space after the words.
Should I write "and" in whole numbers, like one hundred and five?
In US usage, "and" is reserved for the decimal point, so 105 is "one hundred five" and 105.5 is "one hundred five and five tenths." British English normally says "one hundred and five." The converter offers both styles.
Which numbers are hyphenated?
Compound numbers from twenty-one to ninety-nine take a hyphen: twenty-one, forty-five, ninety-nine. Other parts are separated by spaces, so 345 is "three hundred forty-five."
What comes after a trillion?
Quadrillion (10¹⁵), quintillion (10¹⁸), sextillion (10²¹), septillion (10²⁴) and so on in steps of a thousand, up to vigintillion (10⁶³). This converter uses the US short scale, where each new name is 1,000 times the last.
How are ordinal numbers spelled?
Only the last word changes: one becomes first, two second, three third, five fifth, eight eighth, nine ninth, twelve twelfth, words ending in -y become -ieth (twentieth), and the rest add -th. So 1,234 is "one thousand two hundred thirty-fourth."