How do I convert km/h to mph?

Multiply km/h by 0.621371 to get mph. For example, 100 km/h ≈ 62 mph.

A knot is a nautical unit of speed equal to one nautical mile per hour, approximately 1.852 km/h or 1.15 mph.

Unit Converters

Speed Converter

Convert between km/h, mph, m/s, knots, and more. Instant velocity unit conversions.

Speed Conversion

Value

From Unit

To Unit

100 km/h =

62.1372

mph

Highway Driving

All Speed Conversions

Meters per Second

27.7778m/s

Kilometers per Hour

100km/h

Miles per Hour

62.1372mph

Knot

53.9958kn

Feet per Second

91.1345ft/s

Speed Reference

Walking Speed5 km/h ≈ 3.1 mph

Running Speed10 km/h ≈ 6.2 mph

Speed of Sound1,235 km/h ≈ 767 mph

How Speed Conversion Works

Speed is distance over time. Conversions involve adjusting both the distance unit (meters, kilometers, miles) and time unit (seconds, hours) to match the desired format.

Quick Conversion Tips

11 mph ≈ 1.609 km/h
21 knot = 1.852 km/h (nautical mile per hour)
3Speed of sound ≈ 343 m/s at sea level

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