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. There are 0.6213711922 mi/s in 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. There are 1.609344 km/s in mi/s.

Let's take a closer look at the conversion formulas so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.

The formula to convert from mi/s to km/s is:

km/s = mi/s x 1.609344

The formula to convert from km/s to mi/s is:

mi/s = km/s ÷ 1.609344

Next, let's look at some examples showing the work and calculations that are involved in converting from miles per second to kilometers per second (mi/s to km/s) or converting from kilometers per second to miles per second (km/s to mi/s).

Task: Convert 75 miles per second to kilometers per second (show work)Formula:mi/s x 1.609344 = km/sCalculations:75 mi/s x 1.609344 = 120.7008 km/sResult:75 mi/s is equal to 120.7008 km/s

Task: Convert 2,500 kilometers per second to miles per second (show work)Formula:km/s ÷ 1.609344 = mi/sCalculations:2,500 km/s ÷ 1.609344 = 1,553.4279805933 mi/sResult:2,500 km/s is equal to 1,553.4279805933 mi/s

For quick reference purposes, below are conversion tables that you can use to convert from mi/s to km/s, and km/s to mi/s.

miles per second (mi/s) | kilometers per second (km/s) |
---|---|

1 mi/s | 1.609344 km/s |

2 mi/s | 3.218688 km/s |

3 mi/s | 4.828032 km/s |

4 mi/s | 6.437376 km/s |

5 mi/s | 8.04672 km/s |

6 mi/s | 9.656064 km/s |

7 mi/s | 11.265408 km/s |

8 mi/s | 12.874752 km/s |

9 mi/s | 14.484096 km/s |

10 mi/s | 16.09344 km/s |

20 mi/s | 32.18688 km/s |

30 mi/s | 48.28032 km/s |

40 mi/s | 64.37376 km/s |

50 mi/s | 80.4672 km/s |

75 mi/s | 120.7008 km/s |

100 mi/s | 160.9344 km/s |

250 mi/s | 402.336 km/s |

500 mi/s | 804.672 km/s |

750 mi/s | 1,207.008 km/s |

1,000 mi/s | 1,609.344 km/s |

2,500 mi/s | 4,023.36 km/s |

5,000 mi/s | 8,046.72 km/s |

7,500 mi/s | 12,070.08 km/s |

10,000 mi/s | 16,093.44 km/s |

25,000 mi/s | 40,233.6 km/s |

50,000 mi/s | 80,467.2 km/s |

75,000 mi/s | 120,700.8 km/s |

100,000 mi/s | 160,934.4 km/s |

250,000 mi/s | 402,336 km/s |

kilometers per second (km/s) | miles per second (mi/s) |
---|---|

1 km/s | 0.6213711922 mi/s |

2 km/s | 1.2427423845 mi/s |

3 km/s | 1.8641135767 mi/s |

4 km/s | 2.4854847689 mi/s |

5 km/s | 3.1068559612 mi/s |

6 km/s | 3.7282271534 mi/s |

7 km/s | 4.3495983457 mi/s |

8 km/s | 4.9709695379 mi/s |

9 km/s | 5.5923407301 mi/s |

10 km/s | 6.2137119224 mi/s |

20 km/s | 12.4274238447 mi/s |

30 km/s | 18.6411357671 mi/s |

40 km/s | 24.8548476895 mi/s |

50 km/s | 31.0685596119 mi/s |

75 km/s | 46.6028394178 mi/s |

100 km/s | 62.1371192237 mi/s |

250 km/s | 155.3427980593 mi/s |

500 km/s | 310.6855961187 mi/s |

750 km/s | 466.028394178 mi/s |

1,000 km/s | 621.3711922373 mi/s |

2,500 km/s | 1,553.4279805933 mi/s |

5,000 km/s | 3,106.8559611867 mi/s |

7,500 km/s | 4,660.28394178 mi/s |

10,000 km/s | 6,213.7119223733 mi/s |

25,000 km/s | 15,534.2798059333 mi/s |

50,000 km/s | 31,068.5596118667 mi/s |

75,000 km/s | 46,602.8394178 mi/s |

100,000 km/s | 62,137.1192237334 mi/s |

250,000 km/s | 155,342.7980593335 mi/s |

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.