Use these online calculators to convert between miles per second (mi/s) and kilometers per second (km/s). These Speed conversion calculators provide a quick and easy way to convert mi/s to km/s, or km/s to mi/s.
Enter your value in one of the conversion calculators below to convert mi/s to km/s or convert km/s to mi/s.
How to convert mi/s to km/s: Use the conversion calculator titled "Convert mi/s to km/s". Enter a value in the mi/s field and click on the "Calculate km/s" button. Your answer will appear in the km/s field.
How to convert km/s to mi/s: Use the conversion calculator titled "Convert km/s to mi/s". Enter a value in the km/s field and click on the "Calculate mi/s" button. Your answer will appear in the mi/s field.
The following is a list of definitions relating to conversions between miles per second and kilometers per second.
Miles per second is a unit of speed in both US Customary Units as well as the Imperial System. It measures the number of miles travelled in a second. The symbol for miles per second is mi/s.
Kilometers per second is a unit of speed in the Metric System. It measures the number of kilometers travelled in a second. The symbol for kilometers per second is km/s and the International spelling is kilometres per second.
This table provides a summary of the Speed units within their respective measurement systems.
|inches per second||in/s||US Customary Units (and Imperial)|
|feet per second||ft/s||US Customary Units (and Imperial)||1 ft/s = 12 in/s|
|yards per second||yd/s||US Customary Units (and Imperial)||1 yd/s = 3 ft/s|
|miles per second||mi/s||US Customary Units (and Imperial)||1 mi/s = 1760 yd/s
1 mi/s = 5280 ft/s
|millimeters per second||mm/s||Metric System||1000 mm/s = 1 m/s|
|centimeters per second||cm/s||Metric System||100 cm/s = 1 m/s
1 cm/s = 10 mm/s
|decimeters per second||dm/s||Metric System||10 dm/s = 1 m/s
1 dm/s = 10 cm/s
|meters per second||m/s||Metric System||1 m/s = 1000 mm/s
1 m/s = 100 cm/s
1 m/s = 10 dm/s
|kilometers per second||km/s||Metric System||1 km/s = 1000 m/s|