Sub-40 5K

Mile-by-mile splits for 40:00

Five kilometres is short enough that pacing feels like a formality and long enough that it absolutely is not. The even-split table holds 12:52 per mile to 40:00, passing halfway at 20:00. Go through the first mile more than a few seconds under and the third mile stops being a race and becomes damage control.

The negative-split table opens at 13:00 per mile and closes at 12:45, hitting halfway at 20:12. In a 5K the margin is thin enough that this is less about fuel and more about nerve: it keeps the last kilometre under your control, which is exactly where a sub-40 is won or lost.

Even splits — 12:52 per mile

Even pacing: 12:52 per mile for all 3.1 miles, finishing in 40:00.

Slight negative split — 13:00 out, 12:45 home

One percent either side of even: 13:00 per mile through halfway (20:12), then 12:45 home. Same 40:00 finish. The mile that straddles halfway blends both paces.

Per kilometre — 8:00 per km

Even pacing in metric: 8:00 per kilometre across 5.0 km.

Are you ready for a sub-40 5K?

Equivalent times are computed from the rounded VDOT of 21.7, so the 5K row lands within a few seconds of 40:00 rather than exactly on it. That is rounding, not a different prediction.

The equivalents above are reference points, nothing more: it lines up with about a 1:23:18 10K and a 3:03:18 half marathon. Nobody needs a racing CV to chase a sub-40 5K — the table is just the tape measure this site uses to keep every number on the page honest.

One thing the table says quietly is worth hearing out loud: even at 12:52 per mile, a 5K is raced faster than your threshold pace of 13:14. It is supposed to feel hard — it feels hard for the person who finishes in sixteen minutes too. The training that gets you under 40:00 is modest and repeatable: easy running at 15:41 most days, a few relaxed strides when the legs feel good, and the patience to show up again next week. The 5K's great gift is that next week always comes quickly.

Forty minutes is the ladder's open door. At 8:00 per kilometre — eight minutes, flat — walking breaks are not an exception to the plan; for many finishers they are most of it, with purposeful running laid in as strength allows. This is a real 5K raced against a real clock: halfway at 20:00, an average of 12:52 per mile assembled however your body assembles it, and a finish that converts 'I am trying to start running' into 'I have a 5K time' — the sentence every other rung on this ladder is built on. The table above already knows your next number. Take the door.

Where do you stand right now?

Enter a race you have actually run and this will tell you where you stand against the 21.7 VDOT a sub-40 5K requires — your score, the target, and the gap. Nothing is stored or sent anywhere.

Training paces for a sub-40 5K

These are day-one paces for the 21.7 VDOT behind a sub-40 5K. The one that matters most is the easy pace of 15:41 per mile — slower than you think it should be, and the single biggest reason people arrive on race day healthy instead of injured.

Easy pace is a range rather than a point — Daniels defines it as 59–74% of VO₂max, which for the fitness behind a sub-40 5K runs from 15:04 to 17:44 per mile. The single easy figure below is the 70% value.

Sub-40 5K FAQ