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.
Unit | Symbol | Measurement System | Description |
---|---|---|---|
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 |