Source: https://developers.google.com/style/units-of-measure\n\n# Units of measurement



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      Save and categorize content based on your preferences.\n\n- Home\n- Products\n- Style\n\n\n## Page Summary\n\n- Use a nonbreaking space ( ) between numbers and most units of measurement (e.g., 64 GB), except for currency, percent, or degrees of an angle.\n- For temperature, use ° C or ° F, and for Kelvin, use  K (e.g., 50° C, 300 K).\n- In ranges, repeat the unit for each number and use "to" instead of a hyphen (e.g., -40° C to 85° C).\n- When documenting technology, ensure you use the correct system for bytes, distinguishing between decimal (kB, MB, GB) and binary (KiB, MiB, GiB) units.\n- Use visuals like diagrams or charts to enhance comprehension of math concepts and accompany numerical concepts with real-world implications whenever possible.\n\nUse a nonbreaking space ( ) between numbers and most units of measurement (e.g., 64 GB), except for currency, percent, or degrees of an angle.\n\nFor temperature, use ° C or ° F, and for Kelvin, use  K (e.g., 50° C, 300 K).\n\nIn ranges, repeat the unit for each number and use "to" instead of a hyphen (e.g., -40° C to 85° C).\n\nWhen documenting technology, ensure you use the correct system for bytes, distinguishing between decimal (kB, MB, GB) and binary (KiB, MiB, GiB) units.\n\nUse visuals like diagrams or charts to enhance comprehension of math concepts and accompany numerical concepts with real-world implications whenever possible.\n\nPut a nonbreaking space between the number and the unit.\n\n\n## Spaces in units of measurement\n\nFor most units of measurement, when you specify a number with the unit, use a
nonbreaking space between the number and the unit. This guidance applies in both
HTML and Markdown.\n\nFor guidance about when to spell out units, see the
Abbreviations page.\n\nRecommended: 64 GB (64 GB)\n\nRecommended: 25 mm (25 mm)\n\nNot recommended: 64 GB\n\nNot recommended: 64GB\n\nFor more information about making abbreviations plural, see Plural abbreviations.\n\nHowever, when the unit of measure is money or percent or degrees of an angle,
don't use a space. For more information, see Currency.\n\nRecommended: $10\n\nRecommended: £25\n\nRecommended: 65%\n\nRecommended: 180°\n\nFor degrees of temperature, don't use a space before the degree symbol, but
do use a nonbreaking space between the degree symbol and the abbreviation for
the temperature scale (F or C). For Kelvin temperatures, leave
out the degree symbol but use a nonbreaking space before the K.\n\nRecommended: 50° C (50° C)\n\nRecommended: 300 K (300 K)\n\nWhen a number and unit of measurement combine to modify a noun, don't hyphenate unless
  the hyphen is needed for clarity.\n\nRecommended:
    200 GB disk (200 GB disk)\n\n\n## Ranges of numbers with units\n\nIn a range of numbers, repeat the unit for each number. Unit includes both symbols (like
  the degree symbol (º)) and abbreviations (like MB for megabytes) but not nouns
  (like file). For more information, see
  Range of numbers.\n\nUse the word to between the numbers, rather than a hyphen. A hyphen
can be misinterpreted as a subtraction sign.\n\nRecommended: -40° C to 85° C\n\nNot recommended: -40-85° C\n\n\n## Hyphens with multiplied units\n\nWhen the components of a unit of measurement are multiplied by each other,
    hyphenate them.\n\nRecommended: 5 vCPU-hours\n\nRecommended: 40 person-hours\n\n\n## Use k to indicate thousands\n\nIn some contexts, it might be appropriate to indicate thousands of something by
following a number with a lowercase k. If you do that, then follow these
guidelines:\n\n- Don't put a space between the number and k.\n- Add a noun to indicate what the number measures, and to make clear that
you're not using k as an abbreviation for kilobytes.\n\nRecommended: On this plan, you are
limited to 55k download operations and 20k upload operations per day.\n\n\n## Currency\n\nIf you're writing about monetary amounts, make sure that the reader knows what
currency you're referring to. For example, the dollar sign—the $
symbol—can refer to US dollars, Canadian dollars, Mexican pesos, and several
other currencies.\n\nIf there's any possibility of ambiguity, use a currency indicator before
the amount. For details, see section 9.20 and following in the Chicago
Manual of Style, 17th edition.\n\nRecommended: US$10\n\n\n## Rates\n\nUse per instead of the division slash (/) when space permits.
  It's OK to use the division slash when space is limited,
  such as in a table with small cells.\n\nShorten per to p only for well-established abbreviations for
  rate units, such as Gbps for gigabits per second or
  MBps for megabytes per second.\n\nRecommended: requests per day\n\nNot recommended: requests/day\n\nRecommended: Gbps\n\nNot recommended: Gb/s\n\n\n## Decimal and binary units\n\nUse the same system to measure bytes as the technology that you're documenting.
  Don't use MB if you mean MiB, or GB if you mean GiB. The following
  table lists common types of
  decimal and binary units:\n\n\nDecimal units | Binary units\nkB (kilobyte, or 1000 bytes) | KiB (kibibyte, or 1024 bytes)\nMB (megabyte, or 10002 bytes) | MiB (mebibyte, or 10242 bytes)\nGB (gigabyte, or 10003 bytes) | GiB (gibibyte, or 10243 bytes)\n\nFor more information about abbreviating measurement terms, see
  When to spell out a term.\n\n\n## More resources\n\n- Mathematical notation\n- Numbers\n