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|---|---|
| Millimeters / Hour (mm/h) | The Millimeters / Hour (mm/h) is a unit of velocity representing the distance in millimeters traveled in one hour.
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| Millimeters / Minute (mm/min) | The Millimeters / Minute (mm/min) is a unit of velocity representing the distance in millimeters traveled in one minute.
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| Millimeters / Second (mm/s) | The Millimeters / Second (mm/s) is a unit of velocity representing the distance in millimeters traveled in one second.
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| Centimeters / Hour (cm/h) | The Centimeters / Hour (cm/h) is a unit of velocity representing the distance in centimeters traveled in one hour.
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| Centimeters / Minute (cm/min) | The Centimeters / Minute (cm/min) is a unit of velocity representing the distance in centimeters traveled in one minute.
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| Centimeters / Second (cm/s) | The Centimeters / Second (cm/s) is a unit of velocity representing the distance in centimeters traveled in one second.
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| Meters / Hour (m/h) | The Meters / Hour (m/h) is a unit of velocity representing the distance in meters traveled in one hour.
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| Meters / Minute (m/min) | The Meters / Minute (m/min) is a unit of velocity representing the distance in meters traveled in one minute.
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| Meters / Second (m/s) | The Meters / Second (m/s) is a unit of velocity representing the distance in meters traveled in one second.
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| Miles / Second (mps) | The Miles / Second (mps) is a unit of velocity representing the distance in miles traveled in one second.
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| Miles / Minute (mpm) | The Miles / Minute (mpm) is a unit of velocity representing the distance in miles traveled in one minute.
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| Miles / Hour (mph) | The Miles / Hour (mph) is a unit of velocity representing the distance in miles traveled in one hour.
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| Kilometers / Hour (kph) | The Kilometers / Hour (kph) is a unit of velocity representing the distance in kilometers traveled in one hour.
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| Kilometers / Minute (km/min) | The Kilometers / Minute (km/min) is a unit of velocity representing the distance in kilometers traveled in one minute.
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| Kilometers / Second (km/s) | The Kilometers / Second (km/s) is a unit of velocity representing the distance in kilometers traveled in one second.
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| Yards / Hour (yd/h) | The Yards / Hour (yd/h) is a unit of velocity representing the distance in yards traveled in one hour.
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| Yards / Minute (yd/min) | The Yards / Minute (yd/min) is a unit of velocity representing the distance in yards traveled in one minute.
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| Yards / Second (yd/s) | The Yards / Second (yd/s) is a unit of velocity representing the distance in yards traveled in one second.
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| Feet / Hour (ft/h) | The Feet / Hour (ft/h) is a unit of velocity representing the distance in feet traveled in one hour.
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| Feet / Minute (ft/min) | The Feet / Minute (ft/min) is a unit of velocity representing the distance in feet traveled in one minute.
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| Feet / Second (ft/s) | The Feet / Second (ft/s) is a unit of velocity representing the distance in feet traveled in one second.
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| Knot (UK) (kt) | The Knot (UK) (kt) historically was used in the United Kingdom and some of its former territories,
where it was defined slightly differently.In the UK system, a nautical mile was
defined as 1853.184 meters, making the knot(UK) very slightly larger than the
international knot. This means the knot(UK) was defined as 1 nautical mile per
hour, where the nautical mile was slightly longer
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| Knots (kn) | The Knots (kn) is a unit of velocity used in maritime and aviation contexts, representing
one nautical mile per hour.
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| Light Velocity in Vacuum (c) | The Light Velocity in Vacuum (c) is the speed at which light travels in a vacuum.
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| Cosmic Velocity First (v1) | The Cosmic Velocity First (v1) is the minimum velocity an object needs to orbit the Earth without propulsion.
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| Cosmic Velocity Second (v2) | The Cosmic Velocity Second (v2) is the minimum velocity an object needs to escape Earth's gravitational field.
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| Cosmic Velocity Third (v3) | The Cosmic Velocity Third (v3) is the minimum velocity an object needs to escape the solar system.
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| Cosmic Velocity Fourth (v4) | The Cosmic Velocity Fourth (v4) is the minimum velocity an object needs to escape our galaxy - the Milky Way.
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| Earth's Velocity (vE) | The Earth's Velocity (vE) is the average orbital speed of Earth around the Sun.
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| Velocity of Sound in Air [20°C] (v_sound_air) | The Velocity of Sound in Air [20°C] (v_sound_air) is the speed at which sound travels in air at 20°C.
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| Velocity of Sound in Water (v_sound_water) | The Velocity of Sound in Water (v_sound_water) is the speed at which sound travels in water.
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Every unit here is a distance unit paired with a time unit, which is why there are so many of them: any length can be combined with any interval. Meters per second, kilometers per hour, feet per second, and miles per hour are the same quantity expressed with different building blocks.
This also means conversion involves two factors, not one. Going from kilometers per hour to meters per second means multiplying the distance by 1,000 and dividing the time by 3,600 — which works out as dividing by 3.6. Handling both parts is where manual conversions usually go wrong.
Strictly speaking, speed and velocity are not identical: velocity includes direction, speed does not. The units are the same either way, and in ordinary use the terms are interchangeable.
The SI unit, and the one used in physics because it combines cleanly with other SI quantities. It is less intuitive for road speeds, where the numbers come out small — 30 m/s is already a brisk highway pace.
The standard for road speed almost everywhere. Convenient because typical speeds land in a readable range and because distances on signs are in kilometers.
Used for road speeds in the United States and United Kingdom. One mile per hour is about 1.609 km/h, so a 70 mph limit is roughly 113 km/h.
One nautical mile per hour, used in air and sea navigation. Because a nautical mile is one minute of latitude, speed in knots relates directly to position on a chart. This tool offers both the international knot, based on 1,852 meters, and the slightly larger UK knot.
Several entries are physical constants rather than ordinary units, which makes them useful for putting a speed in context.
These four thresholds describe the speed needed to escape successively larger gravitational systems, and they are why launching a spacecraft further costs so much more energy.
Divide by 3.6. That single factor combines both parts of the conversion: 1,000 meters per kilometer divided by 3,600 seconds per hour. To go the other way, multiply by 3.6.
Because a nautical mile is one minute of latitude, so speed in knots translates directly into position change on a chart. The name comes from the practice of counting knots on a line paid out behind a ship to measure its speed.
No. Mach number is a ratio to the local speed of sound, which depends on the temperature of the air. Mach 1 at sea level is around 1,235 km/h, but it is meaningfully slower in the cold air at cruising altitude.
Speed is how fast something moves; velocity is speed together with direction. A car going around a roundabout at a constant speed has a continuously changing velocity. The units are identical, so this tool converts either.
Because it is a definition rather than a measurement. Since 1983 the meter has been defined as the distance light travels in 1/299,792,458 of a second, which fixes the speed of light exactly and makes the meter depend on it.
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