Speed Conversions

Speed conversions are used across automotive, aviation, maritime, sports, and physics contexts. Miles per hour (mph) is the road speed standard in the US and UK, while km/h dominates in most other countries. Knots are the universal unit for ships and aircraft, and Mach numbers describe supersonic flight. Converting accurately between these units is essential for international travel, navigation, and engineering.

  • ✓Converting mph to km/h for driving speed limits in metric countries
  • ✓Converting km/h to mph for US audiences reading international news or specs
  • ✓Converting knots to mph or km/h for weather systems and maritime navigation
  • ✓Converting m/s to km/h for physics problems and sports science analysis

Most Popular Speed Conversions

mph → km/hkm/h → mphKnots → mphmph → Knotsm/s → km/hkm/h → m/s

All Speed Converters

Convert from Meters per Second (m/s)

Meters per Second → Kilometers per HourMeters per Second → Miles per HourMeters per Second → KnotsMeters per Second → Feet per SecondMeters per Second → Mach

Convert from Kilometers per Hour (km/h)

Kilometers per Hour → Meters per SecondKilometers per Hour → Miles per HourKilometers per Hour → KnotsKilometers per Hour → Feet per SecondKilometers per Hour → Mach

Convert from Miles per Hour (mph)

Miles per Hour → Meters per SecondMiles per Hour → Kilometers per HourMiles per Hour → KnotsMiles per Hour → Feet per SecondMiles per Hour → Mach

Convert from Knots (kn)

Knots → Meters per SecondKnots → Kilometers per HourKnots → Miles per HourKnots → Feet per SecondKnots → Mach

Convert from Feet per Second (ft/s)

Feet per Second → Meters per SecondFeet per Second → Kilometers per HourFeet per Second → Miles per HourFeet per Second → KnotsFeet per Second → Mach

Convert from Mach (Ma)

Mach → Meters per SecondMach → Kilometers per HourMach → Miles per HourMach → KnotsMach → Feet per Second

Frequently Asked Questions — Speed

How do I convert mph to km/h?
Multiply miles per hour by 1.60934 to get km/h. For example, 60 mph = 96.56 km/h, and 100 mph = 160.93 km/h. To reverse, multiply km/h by 0.62137.
What is Mach 1 in mph and km/h?
Mach 1 (the speed of sound at sea level, 15°C) is approximately 767 mph or 1,235 km/h (343 m/s). The exact value varies with altitude and air temperature — at high altitude, the speed of sound is lower.
What is a knot and why is it used in aviation and maritime?
A knot equals one nautical mile per hour (1.852 km/h or 1.151 mph). It is tied to the nautical mile, which corresponds to one arcminute of latitude, making it ideal for navigation. It has been the universal standard in aviation and maritime contexts worldwide for over a century.

Related Conversion Categories

Length Conversions

Convert between units of length and distance including metric and imperial measurements.

Time Conversions

Convert between units of time from nanoseconds to years.

Fuel Economy Conversions

Convert between units of fuel economy for automotive and transportation use.

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