The single biggest training mistake amateur marathoners make is running too many of their easy days too fast and too many of their hard days too slow. The fix is a paced training plan: every workout in a defined pace zone, anchored to your goal marathon time. Here's the table — and the why — for every goal time most U.S. recreational runners are chasing.

The five pace zones

  1. Easy (E): conversational. 60–70% of max heart rate. Most weekly mileage lives here.
  2. Marathon pace (M): the pace you intend to run on race day. Used in tune-up workouts.
  3. Threshold (T): "comfortably hard," the pace you could hold for 60 minutes. Improves lactate clearance.
  4. Interval (I): roughly 5K–10K race pace. Done in 3–5 minute reps with rest.
  5. Repetition (R): faster than 5K pace, short reps with full recovery. Builds running economy.

Marathon pace by goal time

Marathon pace = goal time ÷ 26.2 miles. Here are the common targets:

  • 3:00: 6:52/mile, 4:16/km
  • 3:15: 7:26/mile, 4:37/km
  • 3:30: 8:00/mile, 4:58/km
  • 3:45: 8:35/mile, 5:20/km
  • 4:00: 9:09/mile, 5:41/km
  • 4:15: 9:43/mile, 6:02/km
  • 4:30: 10:18/mile, 6:24/km
  • 4:45: 10:52/mile, 6:45/km
  • 5:00: 11:27/mile, 7:07/km

Easy pace — the one most runners get wrong

Easy pace should be roughly 1:00–1:30 slower per mile than marathon pace, sometimes more. So:

  • 3:30 marathoner (8:00/mile MP): easy at 9:00–9:30/mile
  • 4:00 marathoner (9:09/mile MP): easy at 10:09–10:39/mile
  • 4:30 marathoner (10:18/mile MP): easy at 11:18–11:48/mile

If your easy runs feel hard, they're not easy enough. The single most common mistake in amateur marathon training is converting all "easy" miles into moderate-effort miles, which builds fatigue without aerobic gains. Force yourself to slow down.

Threshold pace

Threshold is roughly half-marathon to 15K race pace, or about 30–45 seconds per mile faster than marathon pace:

  • 3:30 marathoner: T-pace ~7:25/mile
  • 4:00 marathoner: T-pace ~8:30/mile
  • 4:30 marathoner: T-pace ~9:45/mile

Tempo runs are 20–40 minutes at threshold. Cruise intervals are 1-mile reps at threshold with 1-minute jogs.

The weekly structure

A solid 16-week marathon build looks like:

  • 2 quality sessions/week: one threshold or marathon-pace, one long run
  • 3–4 easy runs/week at true easy pace
  • 1 long run/week: mostly easy, with the last 20–40 minutes at marathon pace in the final 6 weeks
  • Total weekly mileage: 30–50 mi for 4:30+ goals; 50–70 mi for sub-3:30 goals; 70+ mi for sub-3:00 goals

Pace adjustments for race day

Marathon-day adjustments:

  • Aim to run the first 5K 10–15 seconds/mile slower than goal — banked time at the start almost always costs more later
  • Hit goal pace by mile 5
  • Try to run the second half even or slightly faster than the first
  • If you're more than 30 seconds off goal pace by mile 18, abandon the goal and run for a comfortable finish

Using the calculator

Our marathon pace calculator takes your goal time and outputs marathon pace plus 5K, 10K, half-marathon, and 30K splits — exactly what you need to print on a pace band for race day.