Lauren HollandBy Lauren Holland

Updated November 2026

Your first time marathon pace should be slower than you think, and it should be based on a recent race or training run rather than a hopeful guess. This guide shows you how to pick a realistic pace, break the 26.2 miles into manageable chunks, and hold that pace when adrenaline tries to talk you out of it. Most first-timers who finish strong do three things: they choose a conservative target, they practice it in training, and they hold back in the first ten miles.

Step 1: Estimate Your Starting Pace

Start with a recent race result. A 5K or 10K time gives you the most reliable estimate, though a half marathon works too. Plug your time into a free race predictor, such as the calculators built into many training apps or the Jack Daniels VDOT tables, to get an estimated marathon finish. Then add a buffer. For a first marathon, plan to run 5 to 10 percent slower than the predicted time, since the distance is far more punishing than the calculators assume.

Shopping for one? See our guide: First Ever Marathon Time: 3 Best Guides and Pace Tools for First-Timers.

If you have no recent race, use your easy run pace. Your marathon pace will usually sit about 60 to 90 seconds per mile slower than your comfortable training pace, depending on your fitness and experience.

Step 2: Convert Your Goal Into Mile Splits

Once you have a target finish time, divide it by 26.2 to get your average pace per mile. For example, a 5:00 per mile pace gives you roughly 4 hours and 22 minutes. Then write out a simple split card showing your expected time at each mile marker. Check it at 5, 10, 13.1, 20, and 26.2 miles.

Step 3: Practice Your Pace in Training

Pace is a skill you rehearse, not something you discover on race day. Include these workouts in your plan:

  • Long runs with marathon-pace segments: Run 2 to 4 miles at goal pace in the middle of a 10- to 14-mile run.
  • Progression runs: Start easy and finish the last 2 miles at goal pace.
  • Race simulations: Once or twice before race day, run 16 to 18 miles with the final 8 at goal pace.

Your watch will show a pace that drifts with hills, wind, and heat, so practice pacing by effort too. Marathon effort should feel controlled and sustainable, roughly a 6 out of 10, and you should be able to speak in short sentences.

Step 4: Execute Your Race Plan

Race day tests discipline more than fitness. Use this checklist:

  1. Start 10 to 20 seconds per mile slower than goal pace for the first 3 miles.
  2. Check your pace at each mile marker and adjust gently, not dramatically.
  3. Take water and fuel at planned aid stations, following the fueling plan you practiced in long runs.
  4. Reassess at mile 13. If you feel strong, you can nudge the pace down a few seconds. If not, hold steady.
  5. Save your hardest effort for the final 2 miles, when you have earned the right to push.

For a full week-by-week approach to building the endurance this requires, see First Time Marathon Training Schedule: A 16-Week Plan for Beginners. If you are still deciding on a finish time, Time for First Marathon: How to Pick a Realistic Goal (Step-by-Step) walks through setting targets that match your fitness.

Common Mistakes to Avoid

  • Starting with the crowd. Downhill starts and race-day adrenaline make first miles feel easy, but they cost you later.
  • Choosing a goal based on a best-case training day instead of your typical performance.
  • Skipping pace practice and relying only on feel.
  • Ignoring heat, hills, or wind. Adjust your target by effort rather than forcing the number.
  • Changing pace strategy mid-race because someone passed you.
  • GPS sports watch: Lets you track current pace, average pace, and lap splits in real time, so you can check your plan without guessing. View on Amazon
  • Pace band: A printed wristband with your mile splits gives you a quick reference during the race. View on Amazon
  • Running hydration belt: Carries fuel and water so you can follow your plan without relying solely on aid stations. View on Amazon

FAQ

How much slower should my first marathon pace be than my 10K pace?

Most runners plan for their marathon pace to be roughly 30 to 60 seconds per mile slower than their 10K pace, depending on fitness and experience. Beginners often benefit from the wider end of that range.

Should I run negative splits in my first marathon?

Running the second half slightly faster than the first is a strong goal, and it is achievable if you start conservatively. Do not try it if the first half required more effort than planned.

What if I fall behind my pace plan during the race?

Do not panic or sprint to catch up. Refocus on your effort level, take fuel on schedule, and aim to finish strong rather than chase a split you cannot hold. Consult a coach or sports medicine professional if you have health concerns before training.

Conclusion

A sensible first time marathon pace comes from honest fitness data, a conservative start, and practice in training. Set your target with a buffer, rehearse it in long runs, and hold back early so you have energy for the final miles. Run the race you trained for, and the finish line will come.

Ready to choose one?

Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.