Speed of light in vacuum: 1079252849 km/hr
This calculator helps you estimate the distance travelled after a certain time of constant speed. It also converts to alternative speed units: mile/hr, km/h, m/s, mach, ...
Most countries use the Metric System, which uses the measuring units such as meters and grams and adds prefixes like kilo, milli and centi to count orders of magnitude.
299 792 683 m/s
3 * 108 m/s (scientific)
299.79 * 106 m/s (engineering)
In the USA and UK, the older Imperial system is used, where things are measured in feet, inches and pounds.
1 079 253 659 592 m/hr
983 571 795 ft/sec
1.00 secs
1 sec
1 sec(s)
299 792 683 meter
299.79 * 103 km
186.28 * 103 mile
161.88 * 103 nautical mile