MPH guide: speed units explained

Written by Muneeb Rana · Last updated 26 October 2026

Quick answer: This mph guide covers speed units: what mph means, how it compares to km/h, knots and metres per second, and how to convert between them. It links free converters and benchmarks such as average walking, running and cycling speeds and train and plane speeds. Speedometer PRO switches between MPH and KM/H.

TL;DR

• Units explained.
• Converters.
• Benchmarks.
• App units.
• Sources cited.

MPH guide: articles

• Speedometer MPH and KM/H units: Switch Speedometer PRO between speedometer MPH and KM/H readings. Exact conversion factors, which countries use which, and travelling abroad tips.
• KMH to MPH converter: Convert kmh to mph instantly: type a speed in km/h and get mph. Includes the exact factor (1.609344), a 10–200 km/h table and a mental shortcut.
• MPH to KMH converter: Convert mph to kmh instantly: multiply by 1.609344. Includes a 5–150 mph table, common US and UK limits in km/h, and a quick mental method.
• Knots to MPH converter: Convert knots to mph and km/h: 1 knot = 1.15078 mph = 1.852 km/h exactly. Table of boat, wind and aircraft speeds, and why sailors use knots.
• MPH to meters per second converter: Convert mph to meters per second: multiply by 0.44704. Includes km/h to m/s, a reference table and why phones report speed in m/s.
• MPH vs km/h: MPH vs km/h: what each unit means, the exact conversion (1 mile = 1.609344 km), which countries use which, and quick mental-maths shortcuts.
• What does mph mean?: What does mph mean? Miles per hour explained with examples, history, how it compares to km/h and knots, and everyday speeds from walking to flying.
• What is a knot in speed?: What is a knot? One nautical mile per hour, exactly 1.852 km/h. Why ships and planes use knots, conversions to mph and km/h, and GPS speed on water.

Converters

• KMH to MPH converter: Convert kmh to mph instantly: type a speed in km/h and get mph. Includes the exact factor (1.609344), a 10–200 km/h table and a mental shortcut.
• MPH to KMH converter: Convert mph to kmh instantly: multiply by 1.609344. Includes a 5–150 mph table, common US and UK limits in km/h, and a quick mental method.
• Knots to MPH converter: Convert knots to mph and km/h: 1 knot = 1.15078 mph = 1.852 km/h exactly. Table of boat, wind and aircraft speeds, and why sailors use knots.
• MPH to meters per second converter: Convert mph to meters per second: multiply by 0.44704. Includes km/h to m/s, a reference table and why phones report speed in m/s.

Where mph is used

Miles per hour is the road speed unit in the United States, the United Kingdom and a handful of other countries and territories. Most of the world uses km/h. If you drive across borders, switch units in your app to match the local signs before setting off.

Units in the app

See MPH and KM/H.

Get Speedometer PRO on Google Play · Download on the App Store · Set it up before you move; never handle your phone while driving.

Sources

• Miles per hour (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
• Kilometres per hour (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
• Knot (unit) (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
• Unit conversion (NIST Office of Weights and Measures): nist.gov (accessed 26 October 2026)