Online calculators to convert miles per second to kilometers per second (mi/s to km/s) and kilometers per second to miles per second (km/s to mi/s). Our conversions provide a quick and easy way to convert between Speed units.
Enter your value in one of the conversion calculators below to convert mi/s to km/s or convert km/s to mi/s.
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.
Unit | Symbol | Measurement System | Description |
---|---|---|---|
inches per second | in/s | US Customary Units/Imperial System | |
feet per second | ft/s | US Customary Units/Imperial System | 1 ft/s = 12 in/s |
yards per second | yd/s | US Customary Units/Imperial System | 1 yd/s = 3 ft/s |
miles per second | mi/s | US Customary Units/Imperial System | 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 |
Looking for a conversion? Select a conversion type and the desired units.