Predict Your 10K Time From a Marathon
Ran a Marathon lately? Enter your time to see what it predicts for the 10K, plus the pace you would need to hold.
Worked example
A Marathon of 3:30:00 predicts a 10K of about 45:39, a pace of 7:21 per mi. Change the time above to run the same math on your own result.
How a Marathon predicts your 10K
This prediction reaches back from a marathon all the way down to a 10K, across more than four times the distance. The marathon proves you have a huge aerobic base, far more than a 10K requires, but it says little about the faster gears a sharp 10K relies on. So the predicted time is best seen as a baseline your endurance easily supports.
Most runners who do any speed work will beat a marathon based 10K prediction, sometimes by a fair margin. The marathon is run well below the intensity of a 10K, so it never tests your ability to hold a hard, threshold-or-faster pace for forty-something minutes. Your real 10K likely has more in it.
Why your 10K probably beats this number
A marathon is a long, controlled effort run below your aerobic threshold. A 10K is run at or above it. Those are different intensities, and the marathon simply does not exercise the top end. Riegel assumes your speed and endurance are in balance, but a runner who has trained for a marathon has usually skewed toward endurance, leaving 10K speed on the table.
If your goal is a fast 10K, treat the prediction as a floor and add some quicker work, intervals and tempo runs, over a few weeks. The aerobic strength from your marathon is an excellent foundation. Sharpening the top end is what turns that base into a 10K time well under the prediction.
Want every distance at once? The race pace predictor shows your time for the whole range and prints a pace band, and the VDOT calculator turns this race into your training paces.
Related predictions
Marathon to 10K questions
- Is a marathon a good predictor of 10K time?
- Only as a baseline. The marathon proves deep endurance but never tests 10K-level speed, so most runners with any fast training beat the prediction.
- Why is my real 10K faster than the marathon prediction?
- Because a marathon is run below threshold and a 10K at or above it. Your marathon training skews toward endurance, leaving top-end speed the formula does not account for.
- How can I lower my 10K below the prediction?
- Add interval and tempo work for a few weeks. The aerobic base from your marathon is already strong, so sharpening your speed is what drops the 10K time.