Checks, invoices, contracts and legal filings demand amounts in words: 'one thousand two hundred thirty-four dollars' where a typo can be expensive.
Updated August 15, 2026, after a fresh review, with updated visuals and links.
Paste the number, commas optional, and receive the formal English spelling instantly, up through the billions.
The spelling rules legal documents expect
Compound numbers take a hyphen between tens and ones: twenty-one, forty-seven, ninety-nine. No hyphen below twenty or alone.
Formal American style skips 'and' between hundreds and tens: 123 reads 'one hundred twenty-three', not 'one hundred and twenty-three' (the 'and' marks decimals: one hundred and twenty-three hundredths).
Scale words repeat every three digits: thousand, million, billion; each chunk spells out on its own, joined left to right.
Worth remembering
- On checks, follow the words with the numeric amount in parentheses; on contracts repeat both forms to prevent alteration.
- Decimals on financial documents usually become 'and XX/100' rather than spelling the fraction out.
Frequently asked
Is it 'forty' or 'fourty'?
Forty: the u drops between four and forty in modern English. It is one of the most misspelled number words.
Maximum number handled?
Up to just under a trillion (999,999,999,999), which covers normal checks, invoices and contracts by a wide margin.
