what is the speed of light in mph

The speed of light in miles per hour is approximately 670,616,629 mph. This is a universal constant and is considered the fastest moving thing in the universe. In a vacuum, light travels at exactly 299,792,458 meters per second, which is about 186,282 miles per second. If you could travel at the speed of light, you would be able to circumnavigate the globe approximately seven and a half times in one second.