Miles per hour (mph)

The mile per hour is the unit for road speeds in the United States, the United Kingdom and a few other countries.

Convert miles per hour to any speed unit

1 mile per hour = 1.609344 kilometers per hour

Quick facts

Unit
Mile per hour (plural: miles per hour)
Symbol
mph
Measures
Velocity / Speed
System
Common
Equals
0.44704 meters per second
Definition
One statute mile in one hour (exactly 0.44704 m/s).
Also written
mi/h, MPH

1 mile per hour in other units

Kilometers per hour1.609344 km/h
Meters per second0.44704 m/s
Knots0.8689762419 kn
Feet per second1.466666667 ft/s
Mach (sea level)0.001313703018 Ma
Speed of light1.4911649 × 10-9 c
Beaufort force0.6588098311 Bft
Feet per minute88 ft/min

What is a mile per hour?

The mile per hour is the unit for road speeds in the United States, the United Kingdom and a few other countries. 60 mph is about 96.6 km/h. It is also used for baseball pitches, tennis serves and US wind speeds.

Where the mile per hour sits among speed units

The mile per hour is number 21 of 41 on our scale of speed units, ordered from smallest to largest.

Foot per minute1 mph = 88 ft/min Kilometer per hour1 mph = 1.60934 km/h Foot per second1 mph = 1.46667 ft/s Mile per hourthis unit Knot1 kn = 1.15078 mph Meter per second1 m/s = 2.23694 mph Mach (sea level)1 Ma = 761.207 mph Kilometer per second1 km/s = 2,236.94 mph

What miles per hour are used for

  • US and UK speed limits
  • Sports: pitch and serve speeds
  • US weather: wind and hurricane speeds

Miles per hour in real life

  • US interstate limits are typically 65–75 mph
  • A fastball is about 90–100 mph
  • A Category 5 hurricane has winds of 157 mph or more

Top mile per hour conversions

Common amounts of miles per hour

Convert miles per hour to all 43 other units

Common

Metric

US & imperial

Physics & astronomy

Wind scales

Everyday comparisons

Convert to miles per hour

Frequently asked questions

What is a mile per hour?

The mile per hour is the unit for road speeds in the United States, the United Kingdom and a few other countries.

How is the mile per hour defined?

One statute mile in one hour (exactly 0.44704 m/s).

How many kilometers per hour are in a mile per hour?

One mile per hour equals 1.609344 kilometers per hour.

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

One mile per hour equals 0.44704 meters per second.

How many knots are in a mile per hour?

One mile per hour equals 0.8689762419 knots.