How Long Does It Take to Run a Marathon?

Runners in the ING New York City Marathon in 2013
Maddie Meyer/Getty Images Sport/Getty Images

"I'm running a marathon and I'm not sure what pace to run. How can I estimate my marathon finishing time?"

Finishing times for marathons (26.2 miles) range from a little over two hours for world-class, elite marathoners to 8+ hours for walkers. In terms of average marathon times, the median marathon finishing time in 2015 for men in U.S. marathons was 4:20:13 (9:55/mile pace), according to Running USA.

  The median finishing time for women was 4:45:30 (10:53/mile pace).

Before running your marathon, it's definitely helpful to have an estimate of your marathon finishing time, so you know how to pace yourself properly. You'll also want to give your family members and friends cheering for you an idea of when to expect you on the course. But predicting race times, especially for marathons, can be tough because there are so many variables, such as weather and course conditions. A quick formula that a lot of runners like to use is to take a recent half marathon time, double it, and then add 10-20 minutes, depending on the difficulty of the course.

You can also use race time prediction charts or calculators to determine your marathon time, based on a recent race. For the most accurate prediction, you should use a race time from a race you've done about 4-6 weeks before your marathon.

Here are a couple of good race time prediction calculators to try:

Running for Fitness Race Predictor: Just plug your age, gender, and time/distance from a recent race into the calculator to find out how you might perform in races at other distances. This calculator shows several different predictions, based on different formulas. So you get a range of predicted times, and you can see that it's not an exact science -- just an estimate. Race Results Prediction: Choose a distance and a time to calculate theoretical race results at different distances and check out your marathon prediction.

Runner's World Race Time Predictor: This calculator uses a recent race time as well as details about your training (weekly mileage, etc.) to determine a predicted marathon race time.

Once you have an estimated finishing time, you can use a Pace Calculator to figure out the average pace for that time.

Can I Really Run that Predicted Marathon Time?

Keep in mind that a predicted marathon time is not a guarantee that you'll run that time. You have to do the appropriate endurance training for a marathon, and there are lots of other factors - course difficulty, weather conditions, nutrition, and hydration, how you're feeling - that come into play. In most cases, only experienced marathoners achieve their predicted time or very close to it. If you're running your first marathon, focus on completing the race and finishing strong. Regardless of your time, finishing a marathon is an incredible achievement. If you're looking for a ballpark finishing time prediction for your first marathon, add 5-6% to the calculator prediction.

If you're curious about where you might end up finishing (top 25%, age group winner, etc.) in a particular marathon, look at the online results from last year's race. The range of finishing times and the number of participants will probably be similar this year. Big city marathons and flat, fast marathons tend to be much more competitive than small, local ones. But you'll be much more likely to have others around you to run with if you choose a large marathon.

Some marathons do have time limits, such as six or seven hours (although others have no limit). So, if you're a slower runner or walker, be sure to find out if there's a cut-off time when selecting a marathon.

"2015 Running USA Annual Marathon Report," Running USA

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