Units of measurement

Formatting units of measurement

When specifying a unit of measurement, leave one space between the number and the unit.

Not recommended: 64GB

Recommended: 64 GB

Recommended: 2 TB

However, when the unit of measure is money, degrees, or percent, don't leave a space.

Recommended: $10

Recommended: £25

Recommended: 50°

Recommended: 65%

In some contexts, it may be appropriate to indicate thousands of something by following a number with a lowercase "k". If you do that, then follow these guidelines:

  • Don't put a space between the number and "k".
  • Add a noun to indicate what the number measures, and to make clear that you're not using "k" as an abbreviation for "kilobytes."

Recommended: On this plan, you are limited to 55k download operations and 20k upload operations per day.

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Google Developer Documentation Style Guide
Google Developer Documentation Style Guide