complete.tools

Kilometer per Second Converters

Convert km/s to m/s, km/h, mph, knots, Mach and fractions of the speed of light.

What this tool does

Convert km/s to m/s, km/h, mph, knots, Mach and fractions of the speed of light. Type an amount in kilometers per second, choose the units, and the tool converts it to meters per second. It offers 13 speed units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 13 options, including Kilometer per second, Meter per second, Centimeter per second, Meter per hour, Kilometer per hour, Mile per hour. Starts as Kilometer per second.
  • To: Choose one of the same 13 units as "From". Starts as Meter per second.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from kilometers per second to meters per second:

  • 1 km/s = 1,000 m/s
  • 5 km/s = 5,000 m/s
  • 10 km/s = 10,000 m/s
  • 50 km/s = 50,000 m/s
  • 100 km/s = 100,000 m/s

Multiply the number of kilometers per second by 1,000 to get meters per second. Both units are exact definitions, so 1,000 is the exact factor: 1 km/s = 1,000 m/s.

Sources: Kilometer per second: exact by definition. Meter per second: SI Brochure, 9th edition (2019).

Limitations

  • Mach here means the standard-atmosphere sea level value only. At altitude or in warmer or colder air, the same Mach number is a different speed.
  • Speed of light values are plain multiples of c. They do not include relativistic effects.

FAQs

Q: How many miles per hour is 1 km/s?
A: One kilometer per second is about 2,236.94 mph, or exactly 3,600 km/h.
Q: What fraction of the speed of light is 1 km/s?
A: One kilometer per second is about 0.000003336 of the speed of light, which is exactly 299,792,458 m/s.
Q: Which Mach number does the page use?
A: Mach is shown at sea level in the ISO standard atmosphere at 15 °C, where the speed of sound is 340.294 m/s. The real speed of sound changes with air temperature and altitude.

Explore Similar Tools

Explore more tools like this one: