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mph
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What is a mile per hour?

The US and UK road-speed unit — 1.609 km/h per mph

Definition

Miles per hour (mph) is the standard road-speed unit in the US, UK and a few other countries. US highways typically 65–75 mph; UK motorways 70 mph. US weather reports wind speed in mph, while meteorologists also use knots.

Common uses

  • US and UK road speed limits
  • US car speedometers
  • US baseball pitch speeds

🌍 Real-world scale

US interstate: 70 mph typical. UK motorway: 70 mph limit. Cycling pro speed: 25 mph. Tornado winds: 110+ mph.

Convert from miles per hour

9 conversions
Mile per Hour to Kilometer per Hour1 mph = 1.60934 km/hMile per Hour to Meter per Second1 mph = 0.447 m/sMile per Hour to Knot1 mph = 0.869 knMile per Hour to Mach1 mph = 0.001314 MaMile per Hour to Foot per Second1 mph = 1.46667 ft/sMile per Hour to Centimeter per Second1 mph = 44.704 cm/sMile per Hour to Yard per Minute1 mph = 29.3333 yd/minMile per Hour to Inch per Minute1 mph = 1,056.83 in/minMile per Hour to Beaufort Scale1 mph = 0.447 Bft

Convert to miles per hour

9 conversions
Kilometer per Hour to Mile per Hour1 km/h = 0.6214 mphMeter per Second to Mile per Hour1 m/s = 2.23694 mphKnot to Mile per Hour1 kn = 1.15078 mphMach to Mile per Hour1 Ma = 761.207 mphFoot per Second to Mile per Hour1 ft/s = 0.6818 mphCentimeter per Second to Mile per Hour1 cm/s = 0.02237 mphYard per Minute to Mile per Hour1 yd/min = 0.03409 mphInch per Minute to Mile per Hour1 in/min = 0.0009462 mphBeaufort Scale to Mile per Hour1 Bft = 2.23694 mph

Tips

  • 1 mph = 1.609 km/h = 0.447 m/s.
  • Quick convert: mph × 1.6 = km/h.
  • UK speeds posted in mph on road signs despite general metrication.

Common mistakes

  • Reading a UK road sign "50" as km/h — it's mph (= 80 km/h).
  • Converting mph to km/h by multiplying by 1.5 instead of 1.609 — 7% error.
  • Assuming "mph" and "MPH" differ — capitalisation does not matter.

FAQ about the mile per hour

What is a mile per hour?
Miles per hour (mph) is the standard road-speed unit in the US, UK and a few other countries. US highways typically 65–75 mph; UK motorways 70 mph. US weather reports wind speed in mph, while meteorologists also use knots.
Where is the mile per hour used?
The mile per hour is commonly used for: US and UK road speed limits; US car speedometers; US baseball pitch speeds.
What is an example of a mile per hour in real life?
US interstate: 70 mph typical. UK motorway: 70 mph limit. Cycling pro speed: 25 mph. Tornado winds: 110+ mph.
What category does the mile per hour belong to?
The mile per hour is a unit of speed, part of the 10-unit speed category on UnitConv.
How accurate are mile per hour conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 speed units and their conversions.🚀 Speed hub →