Sub-4:00 Marathon

Mile-by-mile splits for 4:00:00

Even splits are the plan; they are almost never what happens. The table below is the arithmetic: 9:09 per mile, every mile, arriving at 4:00:00 on the nose, with 2:00:00 on the clock at halfway. Print it, tape it to your wrist, and understand that the first half should feel insultingly easy. If mile 3 of a sub-4:00 attempt feels like work, the day is already gone.

The second table is the version experienced marathoners actually run: a one-percent-slow first half (9:15 per mile) paid back over the second (9:04 per mile), reaching halfway at 2:01:12 and still finishing in 4:00:00. Those four seconds a mile early on are the cheapest insurance in the race — glycogen you keep instead of spend, and a late-race gear that a fast first 10K takes away from you permanently.

Even splits — 9:09 per mile

Even pacing: 9:09 per mile for all 26.2 miles, finishing in 4:00:00.

Slight negative split — 9:15 out, 9:04 home

One percent either side of even: 9:15 per mile through halfway (2:01:12), then 9:04 home. Same 4:00:00 finish. The mile that straddles halfway blends both paces.

Per kilometre — 5:41 per km

Even pacing in metric: 5:41 per kilometre across 42.2 km.

Are you ready for a sub-4:00 marathon?

Equivalent times are computed from the rounded VDOT of 37.9, so the marathon row lands within a few seconds of 4:00:00 rather than exactly on it. That is rounding, not a different prediction.

The times above are what 9:09 for 26.2 miles looks like from the other side. To go under 4:00:00, you should already be racing somewhere around a 25:14 5K, a 52:22 10K, or a 1:56:07 half marathon. If you are close on the shorter distances but nowhere near on the marathon, the gap is almost certainly endurance rather than speed — which is the good news, because endurance is the more reliably trainable of the two.

This is the band where the marathon is genuinely fair. The required pace of 9:09 is comfortably slower than your threshold pace of 8:33, so race pace should feel sustainable — bordering on boring — for the first twenty miles. The failure mode is rarely a lack of fitness; it is a first half run four seconds a mile too fast, or a long-run history that stopped at 16 miles. Fix those two and the barrier tends to fall on schedule.

Four hours is the line most first-time marathoners draw, and 9:09 per mile is what draws it. Nine-minute miles for 26.2 miles sounds approachable on a fresh Tuesday and becomes a genuine athletic achievement somewhere around mile twenty-one. What makes sub-four different from the goals above it is that the pace is not the limiter for most people — the last ten kilometres are. That is a preparation problem with a known solution: enough long runs, run slowly enough at 10:16, that four hours on your feet is familiar rather than novel.

Where do you stand right now?

Enter a race you have actually run and this will tell you where you stand against the 37.9 VDOT a sub-4:00 marathon requires — your score, the target, and the gap. Nothing is stored or sent anywhere.

Training paces for a sub-4:00 marathon

These are the paces that go with the 37.9 VDOT a sub-4:00 marathon requires. Treat them as day-one numbers — they should change as you do. The most common mistake is running the easy days too hard: 10:16 per mile is not a suggestion, it is what makes the quality sessions possible.

Easy pace is a range rather than a point — Daniels defines it as 59–74% of VO₂max, which for this fitness runs from 9:49 to 11:44 per mile. The single easy figure below is the 70% value.

One thing to expect: marathon pace below is derived from the rounded VDOT of 37.9, while the goal pace at the top of the page is 4:00:00 divided by 26.2 miles. On some goals those agree exactly and on others they sit a second apart. That is rounding, not disagreement — race off the goal pace.

Sub-4:00 marathon FAQ