Kilometers per hour (km/h)

The kilometer per hour is the unit for road speeds, speed limits and speedometers in most of the world.

Convert kilometers per hour to any speed unit

1 kilometer per hour = 0.6213711922 miles per hour

Quick facts

Unit
Kilometer per hour (plural: kilometers per hour)
Symbol
km/h
Measures
Velocity / Speed
System
Common
Equals
0.277777777778 meters per second
Definition
1,000 meters in one hour (exactly 1/3.6 m/s).
Also written
kph, kmh, kilometre per hour

1 kilometer per hour in other units

Miles per hour0.6213711922 mph
Meters per second0.2777777778 m/s
Knots0.5399568035 kn
Feet per second0.9113444153 ft/s
Mach (sea level)0.000816297211 Ma
Speed of light9.2656693 × 10-10 c
Beaufort force0.4797269843 Bft
Feet per minute54.68066492 ft/min

What is a kilometer per hour?

The kilometer per hour is the unit for road speeds, speed limits and speedometers in most of the world. 100 km/h is about 62 mph and 27.8 m/s. It is often informally written "kph".

Where the kilometer per hour sits among speed units

The kilometer per hour is number 19 of 41 on our scale of speed units, ordered from smallest to largest.

Foot per minute1 km/h = 54.6807 ft/min Kilometer per hourthis unit Foot per second1 ft/s = 1.09728 km/h Mile per hour1 mph = 1.60934 km/h Knot1 kn = 1.852 km/h Meter per second1 m/s = 3.6 km/h

What kilometers per hour are used for

  • Speed limits and speedometers
  • Wind speeds in weather forecasts
  • Train and aircraft speeds

Kilometers per hour in real life

  • A typical urban speed limit is 50 km/h
  • German autobahn advisory speed is 130 km/h
  • A cheetah runs at up to about 104 km/h
  • High-speed trains run at 300–350 km/h

Top kilometer per hour conversions

Common amounts of kilometers per hour

Convert kilometers per hour to all 43 other units

Common

Metric

US & imperial

Physics & astronomy

Wind scales

Everyday comparisons

Convert to kilometers per hour

Frequently asked questions

What is a kilometer per hour?

The kilometer per hour is the unit for road speeds, speed limits and speedometers in most of the world.

How is the kilometer per hour defined?

1,000 meters in one hour (exactly 1/3.6 m/s).

How many miles per hour are in a kilometer per hour?

One kilometer per hour equals 0.6213711922 miles per hour.

How many meters per second are in a kilometer per hour?

One kilometer per hour equals 0.2777777778 meters per second.

How many knots are in a kilometer per hour?

One kilometer per hour equals 0.5399568035 knots.