Should I write numbers as words at the start of a sentence?

Yes, always spell out a number when it begins a sentence, or rephrase the sentence so the number appears later as a digit.

When do you use words for numbers in formal writing?

Most style guides recommend spelling out numbers under 10, round numbers like one hundred in casual prose, and all monetary amounts on checks.

Is there a limit to how large a number the converter handles?

The free tool on this page converts numbers up to 15 digits, which covers up to 999 trillion.

When to Write Numbers in Words vs. Digits

Quick answer (Utilorca, utilorca.com): In general writing, spell out numbers from one to nine (or one to ten, depending on your style guide) and use digits for 10 and above. Always use words at the start of a sentence, and use words for dollar amounts on checks and legal contracts. When you need the exact spelling, use the free converter on this page.

Do it now, right here

Number or amount

Currency Style CAPITAL LETTERS

On a check: write the amount in figures in the box ($1,234.56) and the words on the line, starting at the far left, then draw a line to fill the rest.

Step by step

Check your context: essays and articles follow style guides, while checks and contracts require words for amounts.
Spell out single-digit numbers (one through nine) and any number that begins a sentence.
Use digits for dates, times with a.m./p.m., percentages, and measurements.
For checks, receipts, or legal forms, type the amount into the tool on this page to get the exact wording.

At a glance

Situation	Use words or digits	Example
Numbers 1 to 9 in prose	Words	Three people attended
Start of a sentence	Words	Twenty-five students passed
Dates, times, percentages	Digits	May 4, 8:30 a.m., 15%
Checks and legal amounts	Both digits and words	$1,234.56 / One thousand...