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100km vs 100 km

Both "100km" and "100 km" are correct, but the more common and accepted format is "100 km" with a space between the number and the unit. This is the standard way to express distances in kilometers.
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Explained by Howard B.
Editor at TextRanch

Last updated: September 10, 2024

100km

This format is correct but less common in formal writing.

This format is used to express a distance of 100 kilometers without a space between the number and the unit.

Examples:

  • The race is 100km long.

Alternatives:

  • 100 km
  • 100 kilometers

100 km

This is the more common and accepted format in English.

This format is used to express a distance of 100 kilometers with a space between the number and the unit.

Examples:

  • The road trip is 100 km.

Alternatives:

  • 100km
  • 100 kilometers

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