# Kilometers Per Second to Millimeters Per Second Converter

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Convert Millimeters Per Second to Kilometers Per Second (mm/s to km/s) ▶

## Conversion Table

 kilometers per second to millimeters per second km/s mm/s 1 km/s 1000000 mm/s 2 km/s 2000000 mm/s 3 km/s 3000000 mm/s 4 km/s 4000000 mm/s 5 km/s 5000000 mm/s 6 km/s 6000000 mm/s 7 km/s 7000000 mm/s 8 km/s 8000000 mm/s 9 km/s 9000000 mm/s 10 km/s 10000000 mm/s 11 km/s 11000000 mm/s 12 km/s 12000000 mm/s 13 km/s 13000000 mm/s 14 km/s 14000000 mm/s 15 km/s 15000000 mm/s 16 km/s 16000000 mm/s 17 km/s 17000000 mm/s 18 km/s 18000000 mm/s 19 km/s 19000000 mm/s 20 km/s 20000000 mm/s

## How to convert

1 kilometer per second (km/s) = 1000000 millimeter per second (mm/s). Kilometer Per Second (km/s) is a unit of Speed used in Metric system. Millimeter Per Second (mm/s) is a unit of Speed used in Metric system.

## Kilometers per second: A unit of speed

Kilometers per second (km/s) is a unit of speed or velocity in the International System of Units (SI). It measures how fast an object is moving by calculating the distance traveled in kilometers divided by the time taken in seconds. For example, if a rocket travels 10 kilometers in 5 seconds, its speed is 2 km/s.

## How to convert kilometers per second

Kilometers per second can be converted to other units of speed or velocity by using simple conversion factors. Here are some common units and their conversion factors:

• Meters per second (m/s): To convert from km/s to m/s, multiply by 1000. To convert from m/s to km/s, divide by 1000. For example, 2 km/s is equal to 2000 m/s, and 500 m/s is equal to 0.5 km/s.
• Kilometers per hour (km/h): To convert from km/s to km/h, multiply by 3600. To convert from km/h to km/s, divide by 3600. For example, 2 km/s is equal to 7200 km/h, and 100 km/h is equal to 0.028 km/s.
• Miles per hour (mph): To convert from km/s to mph, multiply by 2236.94. To convert from mph to km/s, divide by 2236.94. For example, 2 km/s is equal to 4473.88 mph, and 60 mph is equal to 0.027 km/s.
• Knots (kn): To convert from km/s to kn, multiply by 1943.84. To convert from kn to km/s, divide by 1943.84. For example, 2 km/s is equal to 3887.68 kn, and 30 kn is equal to 0.015 km/s.
• Feet per second (ft/s): To convert from km/s to ft/s, multiply by 3280.84. To convert from ft/s to km/s, divide by 3280.84. For example, 2 km/s is equal to 6561.68 ft/s, and 100 ft/s is equal to 0.03 km/s.
• Miles per second (mi/s): To convert from km/s to mi/s, multiply by 0.621371. To convert from mi/s to km/s, divide by 0.621371. For example, 2 km/s is equal to 1.24 mi/s, and 1 mi/s is equal to 1.61 km/s.

## Where kilometers per second are used

Kilometers per second are mainly used in astronomy and space science to measure the speed or velocity of celestial bodies and spacecrafts.

For example, the Earth orbits the Sun at an average speed of about 30 km/s.

The Moon orbits the Earth at an average speed of about 1 km/s.

The International Space Station orbits the Earth at an average speed of about 7.66 km/s.

The Voyager 1 spacecraft, which is the farthest human-made object from Earth, travels at a speed of about 17 km/s.

The speed of light in a vacuum is about 300000 km/s.

## Definition of kilometers per second

According to the SI definition, one kilometer per second is the speed of a body that covers a distance of one kilometer in a time of one second.

Mathematically, it can be expressed as:

where v is the speed or velocity in kilometers per second, s is the distance traveled in kilometers, and t is the time taken in seconds.

## History of kilometers per second

The concept of speed or velocity has been studied since ancient times by philosophers and scientists such as Aristotle, Galileo, Newton, etc.

The kilometer was originally defined in 1793 by the French Academy of Sciences as one ten-millionth of the distance from the equator to the North Pole along a meridian through Paris.

The second was originally defined in terms of the Earth’s rotation as one eighty-six thousand four hundredth of a mean solar day.

The combination of these two units resulted in the kilometer per second as a unit of speed or velocity.

The kilometer per second was officially adopted as part of the SI system in 1960.

## Example conversions of kilometers per second to other units

Here are some examples of converting kilometers per second to other units of speed or velocity:

• 1 km/s =1000 m/s = 3600 km/h = 2236.94 mph = 1943.84 kn = 3280.84 ft/s = 0.62 mi/s
• 2 km/s = 2000 m/s = 7200 km/h = 4473.88 mph = 3887.68 kn = 6561.68 ft/s = 1.24 mi/s
• 5 km/s = 5000 m/s = 18000 km/h = 11184.7 mph = 9721.92 kn = 16404.2 ft/s = 3.11 mi/s
• 10 km/s = 10000 m/s = 36000 km/h = 22369.4 mph = 19438.4 kn = 32808.4 ft/s = 6.21 mi/s
• 20 km/s = 20000 m/s = 72000 km/h = 44738.8 mph = 38876.8 kn = 65616.8 ft/s = 12.43 mi/s
• 50 km/s = 50000 m/s = 180000 km/h = 111847 mph = 97219.2 kn = 164042 ft/s = 31.07 mi/s
• 100 km/s = 100000 m/s = 360000 km/h = 223694 mph = 194384 kn = 328084 ft/s = 62.14 mi/s
Kilometers per second also can be marked as km/s and kilometres per second(alternative British English spelling in UK).

## How to convert millimeters per second

Millimeters per second can be converted to other units of speed or velocity by using simple conversion factors. Here are some common units and their conversion factors:

• Meters per second (m/s): To convert from mm/s to m/s, divide by 1000. To convert from m/s to mm/s, multiply by 1000. For example, 1 mm/s is equal to 0.001 m/s, and 10 m/s is equal to 10000 mm/s.
• Kilometers per hour (km/h): To convert from mm/s to km/h, multiply by 0.0036. To convert from km/h to mm/s, divide by 0.0036. For example, 1 mm/s is equal to 0.0036 km/h, and 50 km/h is equal to 13888.89 mm/s.
• Miles per hour (mph): To convert from mm/s to mph, multiply by 0.00223694. To convert from mph to mm/s, divide by 0.00223694. For example, 1 mm/s is equal to 0.00223694 mph, and 30 mph is equal to 13411.2 mm/s.
• Knots (kn): To convert from mm/s to kn, multiply by 0.00194384. To convert from kn to mm/s, divide by 0.00194384. For example, 1 mm/s is equal to 0.00194384 kn, and 15 kn is equal to 7716.12 mm/s.
• Feet per second (ft/s): To convert from mm/s to ft/s, multiply by 0.00328084. To convert from ft/s to mm/s, divide by 0.00328084. For example, 1 mm/s is equal to 0.00328084 ft/s, and 40 ft/s is equal to 12192 mm/s.
• Inches per second (in/s): To convert from mm/s to in/s, multiply by 0.0393701. To convert from in/s to mm/s, divide by 0.0393701. For example, 1 mm/s is equal to 0.0393701 in/s, and 20 in/s is equal to 508 mm/s.

## Where millimeters per second are used

Millimeters per second are mainly used in microbiology and nanotechnology to measure the speed or velocity of microscopic organisms and processes.

For example, the average speed of a bacterium such as Escherichia coli is about 10-20 micrometers per second, which is equivalent to 0.01-0.02 mm/s.

The average speed of a virus such as influenza A virus is about 1 micrometer per second, which is equivalent to 0.001 mm/s.

The average speed of a nanorobot such as a DNA origami walker is about 4 nanometers per second, which is equivalent to 0.000004 mm/s.

## Definition of millimeters per second

According to the SI definition, one millimeter per second is the speed of a body that covers a distance of one millimeter in a time of one second.

Mathematically, it can be expressed as:

where v is the speed or velocity in millimeters per second, s is the distance traveled in millimeters, and t is the time taken in seconds.

## History of millimeters per second

The concept of speed or velocity has been studied since ancient times by philosophers and scientists such as Aristotle, Galileo, Newton, etc.

The millimeter was originally derived from the meter in the late 18th century as one thousandth of a meter.

The second was originally defined in terms of the Earth’s rotation as one eighty-six thousand four hundredth of a mean solar day.

The combination of these two units resulted in the millimeter per second as a unit of speed or velocity.

The millimeter per second was officially adopted as part of the SI system in 1960.

## Example conversions of millimeters per second to other units

Here are some examples of converting millimeters per second to other units of speed or velocity:

• 1 mm/s = 0.001 m/s = 0.0036 km/h = 0.00223694 mph = 0.00194384 kn = 0.00328084 ft/s = 0.0393701 in/s
• 2 mm/s = 0.002 m/s = 0.0072 km/h = 0.00447388 mph = 0.00388768 kn = 0.00656168 ft/s = 0.0787402 in/s
• 5 mm/s = 0.005 m/s = 0.018 km/h = 0.0111847 mph = 0.0097192 kn = 0.0164042 ft/s = 0.196851 in/s
• 10 mm/s = 0.01 m/s = 0.036 km/h = 0.0223694 mph = 0.0194384 kn = 0.0328084 ft/s = 0.393701 in/s
• 20 mm/s = 0.02 m/s = 0.072 km/h = 0.0447388 mph = 0.0388768 kn = 0.0656168 ft/s = 0.787402 in/s
• 50 mm/s = 0.05 m/s = 0.18 km/h = 0.111847 mph = 0.097192 kn = 0.164042 ft/s = 1.9685 in/s
• 100 mm/s = 0.1 m/s = 0.36 km/h = 0.223694 mph = 0.194384 kn = 0.328084 ft/s = 3.93701 in/s
Millimeters per second also can be marked as mm/s and Millimetres per second (alternative British English spelling in UK).

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