How Long Is a 4K? Distance, Time, and What to Expect

Whether you are looking at a charity run sign-up sheet, planning a new walking routine, or scratching your head over an unusual race distance, you might find yourself asking: Just how long is a 4K?

While the fitness world is dominated by the ubiquitous 5K (5 kilometers), the 4K pops up frequently in cross-country events, school athletics, and custom community fun runs.