Numbers and units of measure

Numbers and units of measure

When using numbers in running text, follow these guidelines:

  • Spell out numbers from one to nine. However, use numerals for units of measure.
  • Use Arabic numerals for numbers above ten.
  • If a numeral starts a sentence, spell it out. For example: Five thousand environments have been deployed during the last six months.
  • In one sentence, use either a spelled-out number or a numeral, not both.
  • Use a comma if a numeral includes more than 4 digits. For example: 50,000.

In mathematical expressions:

  • Use the x symbol for multiplication.
  • Add a space between numbers and operators. For example: 256 x 2 = 512.

When using units of measure in running text, follow these guidelines:

  • Use the corresponding unit symbol if a unit of measure comes immediately after a numeral.
    • Kb for kilobit
    • KB for kilobyte
    • kbps for kilobits per second
    • GB for gigabyte
    • Gbit for gigabit
    • MB for megabyte
  • Do not pluralize an abbreviated unit of measure.
  • Add a space between a numeral and a unit of measure.
Creative Commons Attribution 3.0 License

Except where otherwise noted, this document is licensed under Creative Commons Attribution 3.0 License. See all OpenStack Legal Documents.