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Convert mi/s to km/s, km/s to mi/s - Speed Conversion

Use these online calculators to convert between miles per second (mi/s) and kilometers per second (km/s).

Conversion Calculators

Enter your value in one of the conversion calculators below to convert mi/s to km/s or convert km/s to mi/s.

Convert mi/s to km/s

Convert km/s to mi/s

How to convert mi/s to km/s: Use the conversion calculator on the left 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 on the right 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.

Conversion Definitions

Below are definitions relating to these conversion formulas.

What are miles per second (mi/s)?

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.

What are kilometers per second (km/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.

Understanding the Speed Units

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