Write any USD amount the way a check, a contract or an invoice expects it. Switch to Check for the bank line with the cents over one hundred.
Check format sets its own capitalisation: banks expect Title Case, so the option is fixed here.
Type a number to see it spelled out. Pick a currency for an amount with cents, or Check to get the line a bank expects.
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01 · the short answer
In a sentence: one hundred twenty-three dollars and forty-five cents. On a check: One Hundred Twenty-Three and 45/100.
Those are two different formats for the same amount, and using the wrong one is the mistake this page exists to prevent. The sentence form belongs in contracts, invoices and anywhere the amount sits inside running text. The check form belongs on the amount line of a check and essentially nowhere else — it has no currency word, and its cents are a fraction.
Both are produced by the converter above: pick Dollars ($) for the sentence form and Check for the bank line. Writing dollars in words is one of those tasks that is trivial until the amount is long or unusual, and then worth checking rather than reasoning through.
02 · two formats
In a sentence
one hundred twenty-three dollars and forty-five cents
On a check
One Hundred Twenty-Three and 45/100
The check format looks abbreviated, and it is — deliberately. Every element of it exists to remove somewhere a figure could be inserted later. That is also why a whole amount still needs its and 00/100: an empty cents position is an opening. The full walkthrough of the amount line is on the check writing page.
03 · worked amounts
Every line came from the converter above, so what you copy from here matches what the tool produces.
| Figure | In a sentence | On a check |
|---|---|---|
| $1.00 | one dollar | One and 00/100 |
| $0.99 | ninety-nine cents | Zero and 99/100 |
| $20.00 | twenty dollars | Twenty and 00/100 |
| $100.00 | one hundred dollars | One Hundred and 00/100 |
| $123.45 | one hundred twenty-three dollars and forty-five cents | One Hundred Twenty-Three and 45/100 |
| $1,500.00 | one thousand five hundred dollars | One Thousand Five Hundred and 00/100 |
| $2,750.80 | two thousand seven hundred fifty dollars and eighty cents | Two Thousand Seven Hundred Fifty and 80/100 |
| $1,000,000.00 | one million dollars | One Million and 00/100 |
04 · where it appears
▸ checks
The amount line, where the cents are a fraction over one hundred and the word "Dollars" is already printed at the end of the row.
▸ contracts
Payment and consideration clauses, where the amount is usually written both ways: "the sum of Fifty Thousand Dollars ($50,000.00)".
▸ promissory notes
The promise to pay names the amount in words. Since the words control, this is the operative figure in the instrument.
▸ invoices and receipts
Less common than on a check, but used on higher-value invoices for the same reason: a written total is much harder to alter than a printed one.
▸ closing documents
Anything routed through a title or escrow company tends to spell amounts out, often in full capitals.
The pattern behind all five: the amount in words appears wherever a document will outlive the conversation that produced it. On something settled in the room and thrown away, nobody bothers.
05 · the cents
Writing forty-five cents as 45/100 looks like an odd survival, and it is a survival — but it earns its place. A two-digit numerator over a printed 100 is very hard to alter: there is no room to add a digit, and changing a 4 to a 9 leaves an obvious mark in a space that small.
It also survives bad handwriting better than words do. "Forty-five" and "forty-nine" differ by two letters in the middle of a long word; 45 and 49 differ by a whole shape. On a document that gets photographed, faxed and read by a machine, that is worth something.
The variant and no/100 is also accepted for a whole amount, and means the same as 00/100. Both are fine; what is not fine is leaving the cents position empty.
06 · which version wins
When a document states a dollar amount twice and the two disagree, the written words control. That rule is why the amount appears twice at all, and it has a consequence worth sitting with: the figures are the summary, not the amount.
So the field most people fill in carefully — the box with the digits — is the one that matters least, and the long line they scrawl is the one that binds. Reversing that habit costs nothing and removes an entire category of dispute.
If you are on the receiving end, the same rule applies in your favour. Reading the words back into a figure with the words to numbers converter is how you check that the two halves of a check agree before you deposit it.
07 · mistakes
— One Hundred Twenty-Three Dollars and 45/100
+ One Hundred Twenty-Three and 45/100
On a check the word "Dollars" is preprinted at the end of the line. Writing it again leaves the printed one stranded after your amount.
— One Hundred Twenty-Three and 45/100 Cents
+ One Hundred Twenty-Three and 45/100
The fraction already means cents. Adding the word makes it read as forty-five hundredths of a cent.
— Twenty Three Dollars
+ Twenty-Three Dollars
Compound numbers from twenty-one to ninety-nine are hyphenated. It is the most common error in written amounts, and it appears on legal documents constantly.
— $1,234.5
+ $1,234.50
A single decimal place on a dollar amount is ambiguous in a way two places never are. Always write both cent digits.
— Ninety-Nine Cents Only
+ Zero and 99/100
On a check the dollars position should not be left empty. Writing "Zero" closes it.
08 · questions
Q01
Write the dollars in words, then "and", then the cents as a fraction over one hundred: One Hundred Twenty-Three and 45/100. Do not write the word "Dollars" — it is already printed at the end of the amount line. Draw a line through any space left over.
Q02
The usual form gives both versions, words first with the figures in parentheses: "the sum of Fifty Thousand Dollars ($50,000.00)". Here the word "Dollars" does belong, because nothing is preprinted. Capitalisation varies by firm; consistency within the document matters more than which style you pick.
Q03
Yes, and that is the only "and" the line needs. It separates the dollars from the cents. American usage already leaves the connector out after the hundreds, so a correctly written line has exactly one "and" in it.
Q04
In a sentence, write it as cents: "ninety-nine cents". On a check, fill the dollars position with Zero — "Zero and 99/100" — because an empty dollars position is space that can be written into.
Q05
Many firms write them in Title Case or full capitals to make the amount stand out from the surrounding text, and some do both words and figures in capitals. There is no rule requiring it. What matters is that the words and the figures agree, because if they do not, the words are what binds.
Q06
Plural, except for exactly one: one dollar, two dollars, one hundred dollars. The singular only survives in compound modifiers before a noun — "a hundred-dollar bill" — where the unit is hyphenated to the number and drops the "s".
Q07
The same way as any large number, in groups of three with the scale words: "one million two hundred thousand dollars". Scale words stay singular after a figure — two million dollars, never two millions. The converter above handles up to fifteen digits.
Q08
The wording is identical, since they use the same units. What differs is the check convention: Canadian checks follow the American format closely, while other dollar countries vary. Where the currency needs to be unambiguous, write it out — "Fifty Canadian Dollars" — or use the ISO code.
Sentence form for contracts and invoices, check form for the amount line. The converter above produces both — pick the mode and copy.