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Speed Converter

Speed units change depending on where you drive, travel, run, sail, or read technical specifications. OneConvert lets you compare the most common speed units without switching between separate calculators.

How these units are used

  • km/h is the standard road-speed unit in most countries.
  • mph is widely used for road speeds in the United States and United Kingdom.
  • m/s is common in physics, engineering, weather, and scientific work.
  • Knots are used in aviation and maritime navigation.

Quick formulas

  • km/h × 0.621371 = mph
  • mph × 1.609344 = km/h
  • km/h ÷ 3.6 = m/s
  • km/h × 0.539957 = knots

Frequently asked questions

How do I convert km/h to mph?

Multiply km/h by 0.621371. For example, 100 km/h is about 62.14 mph.

How do I convert mph to km/h?

Multiply mph by 1.609344. For example, 60 mph is about 96.56 km/h.

Which countries use mph?

Miles per hour is used for road speeds in places including the United States and United Kingdom, while most countries use km/h.

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