Do you write km or kms?

Do you write km or kms?

The correct way to write the abbreviation for kilometers is km, without the plural "s".

The International System of Units (SI), which is the modern form of the metric system, uses a set of rules for abbreviating units. One of these rules is that units should not be abbreviated in the plural. Therefore, the correct way to write 100 kilometers is 100 km, not 100 kms.

This rule applies to all SI units, not just kilometers. For example, the correct way to write 5 meters is 5 m, not 5 ms, and the correct way to write 2 grams is 2 g, not 2 gs.

Using the correct abbreviations for SI units is important for clarity and consistency in scientific and technical writing. It helps to avoid confusion and errors, and it makes it easier for readers to understand the information being presented.