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Convert Speed

Here you can convert units like kilometer per second, meter per second, kilometer per hour, mile per second, etc. within the speed category.

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Unit Value Actions
kilometer per second km/s
meter per second m/s SI derived unit of speed. Read more
kilometer per hour km/h Standard unit for speed limits worldwide. Read more
Unit Value Actions
mile per second mi/s
mile per hour mph Standard speed unit in US/UK. Read more
foot per second ft/s
Unit Value Actions
knot kn One nautical mile per hour. Used in aviation/marine. Read more
nautical mile per hour nmi/h

Common speed conversion mistakes

  • A knot is one nautical mile per hour, exactly 1.852 km/h, not 1 km/h. A boat doing 20 knots travels at about 37 km/h. Multiply knots by 1.852 to get km/h.
  • Between m/s and km/h the factor is 3.6, an hour has 3,600 seconds and a kilometer 1,000 meters. Multiply m/s by 3.6 to get km/h (10 m/s = 36 km/h) and divide going the other way. Flipping the factor produces a thirteen-fold error.
  • UK and US road signs show miles per hour, not km/h. 1 mph is about 1.609 km/h, so a '70' limit means about 113 km/h. Multiply mph by 1.6 to think in km/h.

Quick conversion quiz

Score: 0

9.4 mile per hour equals 15.1 kilometer per hour.

Correct answer: 9.4 mile per hour = 15.1 kilometer per hour.

4.5 knot equals 4.66 mile per hour.

Correct answer: 4.5 knot = 5.18 mile per hour.

103 knot equals 191 kilometer per hour.

Correct answer: 103 knot = 191 kilometer per hour.

11.4 kilometer per hour equals 2.69 meter per second.

Correct answer: 11.4 kilometer per hour = 3.17 meter per second.

177 knot equals 224 mile per hour.

Correct answer: 177 knot = 204 mile per hour.

Definitions

meter per second (m/s)

SI derived unit of speed.

The meter per second (m/s) is the SI derived unit of speed and velocity. It is defined by the distance in meters divided by the time in seconds.

Read more about meter per second at bipm.org

kilometer per hour (km/h)

Standard unit for speed limits worldwide.

The kilometer per hour (km/h) is a unit of speed, expressing the number of kilometers travelled in one hour. It is the most common unit for speed limits on road signs worldwide.

mile per hour (mph)

Standard speed unit in US/UK.

The mile per hour (mph) is a unit of speed expressing the number of statute miles covered in one hour. It is the standard unit for speed limits in the United States and the United Kingdom.

Read more about mile per hour at nist.gov

knot (kn)

One nautical mile per hour. Used in aviation/marine.

The knot (kn) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h. It is used in meteorology, and in maritime and air navigation.

Read more about knot at bipm.org

Frequently asked questions

How do I convert km/h to mph?

Multiply km/h by 0.621371. Example: 100 km/h ≈ 62.1 mph.

How do I convert mph to km/h?

Multiply mph by 1.609344. Example: 60 mph ≈ 96.6 km/h.

How do I convert m/s to km/h?

Multiply by 3.6. Example: 10 m/s = 36 km/h.

How do I convert km/h to m/s?

Divide by 3.6. Example: 72 km/h = 20 m/s.

What is a knot and how fast is it?

A knot is one nautical mile per hour. 1 knot equals 1.852 km/h.

Why does my quick mental math conversion not match exactly?

Rules of thumb like “divide by 1.6” are approximations. For precise results, use the exact conversion factor in the converter.

How do I use the speed converter on konvertera.nu?

Enter your speed, choose the current unit (like km/h), select the target unit (like mph), and the converter shows the result.

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