When to Write Numbers in Words, and How to Use This Tool
Many formal documents need an amount written in words as well as in figures: bank cheques, rental and sale contracts, invoices and quotations, and payment receipts. The reason is simple. Figures are easy to alter by adding a zero or changing a digit, while an amount written out in words is much harder to tamper with and usually serves as the reference if the two ever disagree. This tool is meant to save you from spelling out numbers by hand, especially long ones where mistakes creep in.
It runs in your browser, so the number you type is not sent to any server, which is reassuring when you are working with money or contract details.
How to use it
- Type the number into the Number box. Thousands separators such as commas are ignored, so 1,250,000 works as well as 1250000.
- Press Convert (or the Enter key) to show the number in words below the button.
- Check the output, then press Copy result to copy it to your clipboard and paste it into your document.
Why use it
- Handles whole numbers up to 15 digits, which reaches the hundreds of trillions.
- Reads decimals digit by digit after the word "point" (3.14 becomes "three point one four") and prefixes negative numbers with "minus".
- A one-click copy button, so you do not have to select text manually.
- Local processing in the browser keeps amounts private.
- Works on phones and computers with nothing to install.
Practical examples
- An accountant preparing a large cheque wants to double-check the amount in words before signing.
- A landlord writes the yearly rent in both figures and words in a lease.
- A purchasing officer adds the quotation total in words under the price table.
- A teacher prepares exercises on reading and writing large numbers.
Tips for writing amounts in words
- Write the words right after the figure and finish with "only" on cheques and receipts, so nothing can be added afterwards.
- Add the currency name and write the decimal part separately, for example "five hundred dollars and fifty cents".
- Hyphenate compound numbers from twenty-one to ninety-nine, as in "forty-two", which is the standard style in English.
- Always check that the figures and words match before approving any financial document; a human review is still essential.
- The tool uses American style without "and" (one hundred one). If your document follows British style, you may prefer "one hundred and one".
Preparing a full invoice? The invoice generator may help. To work out tax before writing the total, use the VAT calculator, and for Roman numerals try the Roman numeral converter.