Universal Speed Converter for Any Pair of Units

Convert any speed unit to any other. This tool includes all known speed measurements from metric, imperial, nautical, astronomical, historical, and scientific systems. Instantly switch between meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), feet per second (ft/s), Mach, astronomical units per year (AU/yr), parsecs per million years (pc/Myr), and many more. Yes, including that one!

How to Use

Enter a value and select the units to convert:

1. Choose the input unit from the dropdown list.
2. Enter the value to be converted.
3. Select the output unit.
4. View the result instantly.
5. Adjust decimal places for precision.
6. Click “Clear All” to reset inputs.

The conversion updates automatically with every change. Each unit comes with a description that appears when selected.

RetroWave speed analogy

Definitions of Speed Units From This Converter

Meters per Second (m/s)

The meter per second (m/s) is the SI base unit of speed, representing the distance traveled in meters every second. It is widely used in physics, engineering, and scientific applications. 1 m/s is equivalent to 3.6 km/h, 2.23694 mph, or 3.28084 ft/s.

Kilometers per Hour (km/h)

Kilometers per hour (km/h) is a metric unit commonly used for measuring vehicle speeds and road signs worldwide. 1 km/h equals 0.277778 m/s, 0.621371 mph, or 0.911344 ft/s.

Miles per Hour (mph)

Miles per hour (mph) is an imperial and US customary unit used primarily for speed limits and vehicle speeds in the United States and the United Kingdom. 1 mph is equal to 1.60934 km/h, 0.44704 m/s, or 1.46667 ft/s.

Knots (kn)

The knot (kn) is a unit of speed used in aviation and maritime navigation. It is defined as one nautical mile per hour. 1 kn equals 1.852 km/h, 0.514444 m/s, or 1.15078 mph.

Feet per Second (ft/s)

Feet per second (ft/s) is an imperial and US customary unit used in sports, ballistics, and engineering. 1 ft/s equals 0.3048 m/s, 1.09728 km/h, or 0.681818 mph.

Inches per Second (in/s)

Inches per second (in/s) is a small-scale speed measurement used in industrial processes and mechanics. 1 in/s equals 0.0254 m/s, 0.09144 km/h, or 0.0568182 mph.

Centimeters per Second (cm/s)

Centimeters per second (cm/s) is a metric unit used in physics, particularly in fluid dynamics and small-scale motion studies. 1 cm/s equals 0.01 m/s, 0.036 km/h, or 0.0223694 mph.

Mach (Ma)

The Mach number (Ma) is a speed measurement relative to the speed of sound in air at sea level (approx. 343 m/s or 1,235 km/h). Mach 1 is the speed of sound, while Mach 2 is twice the speed of sound.

Speed of Light (c)

The speed of light (c) is a fundamental physical constant, defining the speed at which light travels in a vacuum. It is precisely 299,792,458 m/s (approximately 1.08 billion km/h). No object with mass can exceed this speed.

Furlongs per Fortnight

A humorous and rarely used unit, furlongs per fortnight measures speed using old British imperial distance and time units. 1 furlong per fortnight equals approximately 0.0001663 m/s, 0.59712 m/h, or 0.00119388 mph.

Yards per Second (yd/s)

Yards per second (yd/s) is an imperial unit used in some sports and engineering applications. 1 yd/s equals 0.9144 m/s, 3.2928 km/h, or 2.04545 mph.

Miles per Minute (mi/min)

Miles per minute (mi/min) is primarily used in aviation and high-speed calculations. 1 mi/min equals 26.8224 m/s, 96.92 km/h, or 60 mph.

Inches per Hour (in/h)

Inches per hour (in/h) is used in meteorology, engineering, and geological studies to measure slow movements such as glacier shifts and rainfall rates. 1 in/h equals 7.0556e-6 m/s, 0.0000254 km/h, or 0.0000157828 mph.

Centimeters per Hour (cm/h)

Centimeters per hour (cm/h) is a very small speed unit often used in scientific studies related to slow-moving objects, such as plant growth or chemical reactions. 1 cm/h equals 2.7778e-6 m/s, 0.0001 km/h, or 0.000621371 mph.

Kilometers per Second (km/s)

Kilometers per second (km/s) is used for high-speed measurements in astrophysics, rocketry, and physics. 1 km/s equals 1000 m/s, 3,600 km/h, or 2,236.94 mph.

Feet per Minute (ft/min)

Feet per minute (ft/min) is commonly used in ventilation, machinery speeds, and conveyor systems. 1 ft/min equals 0.00508 m/s, 0.018288 km/h, or 0.0113636 mph.

Meters per Minute (m/min)

Meters per minute (m/min) is a practical unit for measuring human walking speeds, treadmill settings, and slow-moving mechanical systems. 1 m/min equals 0.0166667 m/s, 0.06 km/h, or 0.0372823 mph.

Kilometers per Minute (km/min)

Kilometers per minute (km/min) is used in aviation and high-speed rail transportation. 1 km/min equals 16.6667 m/s, 60 km/h, or 37.2823 mph.

Yards per Hour (yd/h)

Yards per hour (yd/h) is an extremely slow speed unit used in historical contexts, surveying, and geological applications. 1 yd/h equals 0.000254 m/s, 0.0009144 km/h, or 0.000568182 mph.

Astronomical Units per Year (AU/yr)

Astronomical Units per Year (AU/yr) is used in celestial mechanics to describe planetary motion. 1 AU is the average distance from Earth to the Sun, and 1 AU/yr equals approximately 4.74 km/s, 17,064 km/h, or 10,603.6 mph.

Chains per Hour (chain/h)

Chains per hour (chain/h) is a historical unit used in land surveying and railway measurements. One chain equals 66 feet, making 1 chain/h equivalent to 0.005588 m/s, 0.0201168 km/h, or 0.0125 mph.

Fathoms per Second (fathom/s)

Fathoms per second (fathom/s) is a nautical unit used in underwater operations and naval contexts. 1 fathom equals 6 feet, so 1 fathom/s is equivalent to 1.8288 m/s, 6.584 km/h, or 4.09149 mph.

Millimeters per Second (mm/s)

Millimeters per second (mm/s) is used in precision engineering, 3D printing, and microfluidics. 1 mm/s equals 0.001 m/s, 0.0036 km/h, or 0.00223694 mph.

Micrometers per Second (µm/s)

Micrometers per second (µm/s) is a unit relevant to microscopic motion, nanotechnology, and biological research. 1 µm/s equals 1e-6 m/s, 3.6e-6 km/h, or 2.23694e-6 mph.

Nanometers per Second (nm/s)

Nanometers per second (nm/s) is used in quantum mechanics, semiconductor manufacturing, and atomic-scale physics. 1 nm/s equals 1e-9 m/s, 3.6e-9 km/h, or 2.23694e-9 mph.

Megameters per Second (Mm/s)

Megameters per second (Mm/s) is used in planetary motion calculations and high-speed astrophysical measurements. 1 Mm/s equals 1,000,000 m/s, 3,600,000 km/h, or 2,236,936 mph.

Gigameters per Second (Gm/s)

Gigameters per second (Gm/s) is an extreme velocity measurement used in galactic-scale calculations. 1 Gm/s equals 1,000,000,000 m/s, 3,600,000,000 km/h, or 2,236,936,000 mph.

Meters per Hour (m/h)

Meters per hour (m/h) is an extremely slow speed measurement, often used in geological studies and slow-moving mechanical processes. 1 m/h equals 0.00027778 m/s, 0.001 km/h, or 0.000621371 mph.

Versts per Hour (verst/h)

Versts per hour (verst/h) is a historical Russian speed unit, where 1 verst is approximately 1.067 kilometers. 1 verst/h equals 0.2963 m/s, 1.06668 km/h, or 0.6629 mph.

Swedish Miles per Hour (mil/h)

Swedish miles per hour (mil/h) is a unit still used in Sweden, where 1 mil equals 10 kilometers. 1 mil/h equals 2.7778 m/s, 10 km/h, or 6.21371 mph.

German Meile per Hour (meile/h)

German Meile per hour (meile/h) is a historical unit where 1 German Meile is approximately 7.5 kilometers. 1 meile/h equals 2.0924 m/s, 7.53264 km/h, or 4.68 mph.

Leagues per Hour (league/h)

Leagues per hour (league/h) is a historic unit found in old European measurements, with variations in different countries. The most common definition equates 1 league to approximately 3 miles. 1 league/h equals 1.341 m/s, 4.8276 km/h, or 3 mph.

Fathoms per Minute (fathom/min)

Fathoms per minute (fathom/min) is a speed unit used in maritime applications, particularly for underwater movements and submarine speeds. 1 fathom/min equals 0.03048 m/s, 0.109728 km/h, or 0.0681818 mph.

Orbital Velocity of Earth (OV)

Orbital velocity (OV) refers to the speed required for an object to stay in a stable orbit around Earth. The average orbital velocity at low Earth orbit is approximately 7.8 km/s. 1 OV equals 7800 m/s, 28,080 km/h, or 17,448 mph.

Escape Velocity (EV)

Escape velocity (EV) is the minimum speed needed to break free from Earth’s gravitational field without propulsion. 1 EV equals 11.2 km/s, 40,320 km/h, or 25,053 mph.

Parsecs per Million Years (pc/Myr)

Parsecs per million years (pc/Myr) is an astrophysical unit used to describe the movement of celestial bodies over vast timescales. 1 pc/Myr equals 977,800 m/s, 3.52 million km/h, or 2.19 million mph.

Solar Escape Velocity

Solar escape velocity is the speed required to break free from the Sun’s gravitational pull from its surface. 1 solar EV equals 617,500 m/s, 2.22 million km/h, or 1.38 million mph.

Speed of a Snail

Speed of a snail is a funny reference for extremely slow movement, often used in scientific jokes. 1 snail speed equals approximately 0.0001 m/s, 0.00036 km/h, or 0.0002237 mph.

Table Of Conversions

How do you use this speed converter? Would you like any additional features, or any more units? Let us know in the comments below, and we’ll consider adding them in future updates.

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