# Miles Per Second to Kilometers Per Day Converter

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Convert Kilometers Per Day to Miles Per Second (km/day to mi/s) ▶

## Conversion Table

 miles per second to kilometers per day mi/s km/day 1 mi/s 139047.322 km/day 2 mi/s 278094.644 km/day 3 mi/s 417141.966 km/day 4 mi/s 556189.288 km/day 5 mi/s 695236.61 km/day 6 mi/s 834283.932 km/day 7 mi/s 973331.254 km/day 8 mi/s 1112378.576 km/day 9 mi/s 1251425.898 km/day 10 mi/s 1390473.22 km/day 11 mi/s 1529520.542 km/day 12 mi/s 1668567.864 km/day 13 mi/s 1807615.186 km/day 14 mi/s 1946662.508 km/day 15 mi/s 2085709.83 km/day 16 mi/s 2224757.152 km/day 17 mi/s 2363804.474 km/day 18 mi/s 2502851.796 km/day 19 mi/s 2641899.118 km/day 20 mi/s 2780946.44 km/day

## How to convert

1 mile per second (mi/s) = 139047.322 kilometer per day (km/day). Mile Per Second (mi/s) is a unit of Speed used in Standard system. Kilometer Per Day (km/day) is a unit of Speed used in Metric system.

## Miles per second: A unit of speed

Miles per second (mi/s) is a unit of speed or velocity in the US customary and imperial systems. It measures how fast an object is moving by calculating the distance traveled in miles divided by the time taken in seconds. For example, if a bullet travels 1 mile in 0.5 seconds, its speed is 2 mi/s.

## How to convert miles per second

Miles 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 mi/s to m/s, multiply by 1609.34. To convert from m/s to mi/s, divide by 1609.34. For example, 1 mi/s is equal to 1609.34 m/s, and 100 m/s is equal to 0.0621371 mi/s.
• Kilometers per hour (km/h): To convert from mi/s to km/h, multiply by 5793.64. To convert from km/h to mi/s, divide by 5793.64. For example, 1 mi/s is equal to 5793.64 km/h, and 50 km/h is equal to 0.00863028 mi/s.
• Miles per hour (mph): To convert from mi/s to mph, multiply by 3600. To convert from mph to mi/s, divide by 3600. For example, 1 mi/s is equal to 3600 mph, and 60 mph is equal to 0.0166667 mi/s.
• Knots (kn): To convert from mi/s to kn, multiply by 3128.31. To convert from kn to mi/s, divide by 3128.31. For example, 1 mi/s is equal to 3128.31 kn, and 15 kn is equal to 0.00479717 mi/s.
• Feet per second (ft/s): To convert from mi/s to ft/s, multiply by 5280. To convert from ft/s to mi/s, divide by 5280. For example, 1 mi/s is equal to 5280 ft/s, and 40 ft/s is equal to 0.00757576 mi/s.
• Inches per second (in/s): To convert from mi/s to in/s, multiply by 63360. To convert from in/s to mi/s, divide by 63360. For example, 1 mi/s is equal to 63360 in/s, and 20 in/s is equal to 0.000315789 mi/s.

## Where miles per second are used

Miles per second are mainly used in physics and astronomy to measure the speed or velocity of very fast objects and phenomena.

For example, the escape velocity of the Earth is about 11 km/s or about 6.84 mi/s.

The orbital velocity of the Earth around the Sun is about 30 km/s or about 18.64 mi/s.

The speed of light in a vacuum is about 300000 km/s or about 186282 mi/s.

The speed of sound in air at sea level is about 343 m/s or about 0.213139 mi/s.

## Definition of miles per second

According to the US customary and imperial systems definition, one mile per second is the speed of a body that covers a distance of one mile in a time of one second.

Mathematically, it can be expressed as:

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

## History of miles 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 mile was originally derived from the Roman mile which was defined as one thousand paces or about 5000 Roman feet.

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 mile per second as a unit of speed or velocity.

The mile per second was officially adopted as part of the US customary and imperial systems in the late 18th century.

## Example conversions of miles per second to other units

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

• 1 mi/s = 1609.34 m/s = 5793.64 km/h = 3600 mph = 3128.31 kn = 5280 ft/s = 63360 in/s
• 2 mi/s = 3218.68 m/s = 11587.28 km/h = 7200 mph = 6256.62 kn = 10560 ft/s = 126720 in/s
• 5 mi/s = 8046.7 m/s = 28968.2 km/h = 18000 mph = 15657.55 kn = 26400 ft/s = 316800 in/s
• 10 mi/s = 16093.4 m/s = 57936.4 km/h = 36000 mph = 31283.1 kn = 52800 ft/s = 633600 in/s
• 20 mi/s = 32186.8 m/s = 115872.8 km/h = 72000 mph = 62566.2 kn = 105600 ft/s = 1267200 in/s
• 50 mi/s = 80467 m/s = 289682 km/h = 180000 mph = 156575.5 kn = 264000 ft/s = 3168000 in/s
• 100 mi/s = 160934 m/s = 579364 km/h = 360000 mph = 312831 kn = 528000 ft/s = 6336000 in/s
Miles per second also can be marked as mps.

## Definition of Kilometers Per Day

Kilometers per day (km/d) is a unit of speed that measures how fast something is moving in terms of kilometers per unit of time. It is a metric unit that is derived from the base unit of length, the kilometer, and the base unit of time, the day. It is rarely used however, as the units of kilometers per hour and meters per second are considered sufficient for most situations.

One kilometer per day is equal to 0.011574074074074 meters per second, or 0.041666666666667 kilometers per hour. It can also be converted to other units of speed, such as miles per hour, feet per second, or knots, by using appropriate conversion factors.

## How to Convert Kilometers Per Day

To convert kilometers per day to other units of speed, we need to multiply or divide by the corresponding conversion factors. For example, to convert kilometers per day to miles per hour, we need to multiply by 0.0254, since there are 0.0254 miles in one kilometer. To convert kilometers per day to meters per second, we need to multiply by 0.011574074074074, since there are 0.011574074074074 meters in one kilometer.

Here are some examples of how to convert kilometers per day to other units of length in the US Standard system and the SI system:

• To convert 10 km/d to miles per hour (mph), we multiply by 0.0254: 10 km/d x 0.0254 = 0.254 mph
• To convert 20 km/d to feet per second (fps), we multiply by 0.0378788, since there are 0.037878788 feet in one meter: 20 km/d x 0.037878788 = 0.75757576 fps
• To convert 30 km/d to knots (kn), we multiply by 0.0218645833, since there are 0.021864583 nautical miles in one kilometer: 30 km/d x 0.0218645833 = 0.6559375 kn
• To convert 40 km/d to meters per second (m/s), we multiply by 0.011574074074074: 40 km/d x 0.011574074074074 = 0.462962962963 m/s
• To convert 50 km/d to meters per minute (m/min), we multiply by 0.6944444, since there are 0.6944444 minutes in one hour: 50 km/d x 0.6944444 = 34.722222 m/min
• To convert 60 km/d to centimeters per second (cm/s), we multiply by 100, since there are 100 centimeters in one meter, and multiply by 0.011574074074074: 60 km/d x 100 x 0.011574074074074 = 69.444444 cm/s

## Where Kilometers Per Day Are Used

Kilometers per day are mainly used for measuring the average speed or distance traveled by an object or phenomenon over a period of time that is measured in days or longer. They are often used in fields such as travel, fitness, sports, and geography, where the speed or distance traveled by an object or phenomenon is measured in terms of kilometers per unit of time.

For example, a person may travel an average of 100 km/d on a road trip across a country, which means that they cover an average distance of 100 kilometers in one day. A runner may run an average of 5 km/d as part of their training routine, which means that they run a distance of 5 kilometers in one day. A planet may have an orbital velocity of thousands of kilometers per day, which means that it covers thousands of kilometers along its orbit in one day.

Kilometers per day are also used in some other fields where the speed or distance traveled by an object or phenomenon is measured in terms of kilometers per unit of time.

## History of Kilometers Per Day

The origin of kilometers per day as a unit of speed can be traced back to the development of the metric system and the kilometer as a unit of length in the late eighteenth century. The kilometer was defined as one thousand meters based on the French standard meter.

The term kilometer first appeared in English in 1810, but it was not until later in the mid-late 19 th century that the use of kilometers per day became more common; before that, other units such as miles per day or leagues per day were preferred for expressing speed.

Kilometers per day have been used ever since as a standard unit of speed for measuring the average speed or distance traveled by an object or phenomenon over a period of time that is measured in days or longer. They have also been adopted by some international organizations and conventions, such as the International System of Units and the International Astronomical Union.

## Example Conversions of Kilometers Per Day to Other Units

Here are some examples of how to convert kilometers per day to other units of speed, using the conversion factors given above:

• To convert 100 km/d to miles per hour, we multiply by 0.0254: 100 km/d x 0.0254 = 2.54 mph
• To convert 200 km/d to feet per second, we multiply by 0.037878788: 200 km/d x 0.037878788 = 7.5757576 fps
• To convert 300 km/d to knots, we multiply by 0.0218645833: 300 km/d x 0.0218645833 = 6.559375 kn
• To convert 400 km/d to meters per second, we multiply by 0.011574074074074: 400 km/d x 0.011574074074074 = 4.62962962963 m/s
• To convert 500 km/d to meters per minute, we multiply by 0.6944444: 500 km/d x 0.6944444 = 347.22222 m/min
• To convert 600 km/d to centimeters per second, we multiply by 100 and multiply by 0.011574074: 600 km/d x 100 x 0.01157407 = 694.44444 cm/s
• To convert 700 km/d to millimeters per minute, we multiply by 1000, since there are 1000 millimeters in one meter, and multiply by 0.6944444: 700 km/d x 1000 x 0.6944444 = 486111.111 mm/min
Kilometers per day also can be marked as kilometer/day and Kilometres per day (alternative British English spelling in UK).

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