Using Commas with Numbers
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Commas can be used with large numbers to assist the reader. They are placed every three decimal places to the left of the decimal point. For example:

  • 123,456.789
(Be aware that most other countries use a comma for the decimal point and full stops / periods to mark out every three decimal places.)

Using Commas with Numbers

Commas can be used to make reading numbers a little easier. They are placed every 3 decimal places for numbers larger than 999.

Examples:

  • 1,234

  • 23,566

  • 1,234,967

  • Serial number 1654880 was destroyed in 1984.
  • (Do not put your own commas in reference numbers or years.)
NO COMMAS TO THE RIGHT OF THE DECIMAL POINT

Do not use commas to the right of the decimal point.

  • 4,567.123456

  • 4,567.123,456
  • (This would be considered unusual.)
BEWARE OTHER CONVENTIONS

The use of commas and full stops in numbers is not consistent across the world. Below are the three most common conventions:

  • 4,567.1
  • (United Kingdom, United States, China)
  • 4.567,1
  • (This convention is used in most of Europe. It is the convention used by most countries.)
  • 4 567,1
  • (This convention is also common. It features in most of the countries which use the convention directly above.)
 
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