So how many miles is a 5K? A 5K is exactly 5 kilometers, which converts to 3.10686 miles. Most runners and race organizers just round that to 3.1 miles. That’s the whole answer — but if you’re training for one or just curious how that distance stacks up against other races, the details are worth knowing.

Where the Number Comes From

The math is simple. One kilometer equals 0.621371 miles. Multiply that by five and you get 3.10686 miles. Race courses, fitness apps, and running watches all round it to 3.1, and nobody in the running world bothers with the extra decimals.

The “K” in 5K stands for kilometers. Most of the world uses the metric system, so race distances are named in kilometers: 5K, 10K, half marathon, marathon. In the US, where miles are the standard unit, runners constantly translate between the two — which is why “how many miles is a 5K” is one of the most searched running questions around.

What 3.1 Miles Feels Like

Numbers on a screen are one thing; what it feels like on your feet is another. Here are a few ways to picture 3.1 miles:

  • On a track: A standard outdoor track is 400 meters per lap. A 5K is exactly 12.5 laps — no guessing, no rounding. Run twelve full laps, then half of one more, and you’re done.
  • On foot: At an average of about 2,000 steps per mile, a 5K takes roughly 6,200 steps. (If you want the full breakdown of stride length and step counts, see our guide on how many steps in a mile.)
  • In feet: A mile is 5,280 feet, so 3.1 miles is about 16,368 feet. More on that conversion in our article on how many feet in a mile.
Running shoes on asphalt beside a race marker
On a standard 400-meter track, 5 kilometers is exactly 12.5 laps.

How a 5K Compares to Other Race Distances

Once you know the 5K, the rest of the common distances click into place:

  • 10K: 10 kilometers, or 6.21371 miles — exactly double the 5K.
  • Half marathon: 13.1094 miles — about 4.2 times a 5K.
  • Marathon: 26.2188 miles — about 8.4 times a 5K, or roughly eight and a half 5Ks back to back.

The 5K is the shortest standard road race distance, which is why it’s the go-to first race: nearly every town hosts one, many support charities, and you don’t need months of base training.

How Long Does a 5K Take?

It depends on your pace, and the range is wide:

  • Walking at a 20-minute mile: about 62 minutes to cover 3.1 miles. Plenty of people walk 5Ks — fun runs welcome it.
  • Beginner runner: most first-timers finish in roughly 30 to 40 minutes. A mix of jogging and walking is completely normal.
  • Regular runner: a comfortable goal is under 30 minutes, which means roughly a 9:40-per-mile pace.
  • Fast club runner: 20 to 25 minutes.
  • Elite: the men’s world record is 12:35.36, set by Joshua Cheptegei in 2020. The women’s record is 14:06.62, set by Letesenbet Gidey in 2021. That’s running each mile in about four minutes — a pace most people couldn’t hold for a single lap.

Calories Burned Running a 5K

A 155-pound person running a 5K in about 30 minutes burns roughly 300 to 400 calories. Lighter runners burn a bit less, heavier runners a bit more, and running faster or slower shifts the number too.

Tips If You’re Training for Your First 5K

You don’t need anything fancy — a decent pair of running shoes and a plan you can stick to.

  • Build up gradually. If you’re starting from zero, alternate one minute of jogging with one minute of walking, and stretch the jogging intervals each week.
  • Run three times a week. Consistency beats heroics. Three easy sessions beat one punishing one.
  • Find your pace. You should be able to hold a conversation while you run. If you can’t talk, you’re going too fast.
  • Do a test run. A week before the race, cover the full 3.1 miles at an easy pace so the distance feels familiar.
  • Don’t sprint the start. Race-day adrenaline makes everyone go out too fast. Settle into your rhythm in the first half mile and you’ll pass plenty of people in the last one.

Frequently Asked Questions

Is a 5K exactly 3.1 miles?

Close, but not exact. A 5K is exactly 5 kilometers, which is 3.10686 miles. Rounding to 3.1 miles is standard everywhere — race results, training plans, and GPS watches all use 3.1.

How many laps is a 5K on a track?

Exactly 12.5 laps on a standard 400-meter track. Twelve full laps plus one half lap gets you to 5,000 meters.

Is a 5K a good distance for beginners?

Yes — it’s the most beginner-friendly race distance there is. Most people can go from couch to a 5K finish line in six to eight weeks of steady training, and plenty finish by walking part or all of it.

What’s the difference between a 5K and a 10K?

A 10K is exactly twice the distance: 6.21371 miles versus the 5K’s 3.10686 miles. A 10K takes noticeably more training, but many runners step up to it after a few 5Ks.