Training · Free tool
Race Recovery Time Calculator
Pick the race you ran and how hard you ran it, and we lay out the recovery: days completely off, how long to keep every run easy, when to attempt a hard session again, and when racing is reasonable. Add your race date to see it as calendar days.
One easy day per mile
The oldest rule in the book — an easy day for every mile raced — has survived because it works. It puts a marathon at around four weeks before racing hard again, a half at about two, and a 5K at three or four days, which is close to what Jack Daniels, Pete Pfitzinger and Hal Higdon all recommend by other routes.
The damage is not just fatigue. Hard racing leaves muscle damage, depleted glycogen and a suppressed immune system, and the last of those is why so many runners catch a cold in the week after a marathon. The first few days should involve no running at all.
What to do in the meantime
Walking, easy cycling and swimming are all fine during the no-running phase and help more than complete rest. When you do start running, keep every run easy and short — the aim is circulation, not fitness — and stop the moment anything hurts differently from ordinary soreness.
A common trap is feeling good after ten days and racing a local 10K, then finding the legs have nothing. Recovery of how you feel runs ahead of recovery of what you can produce, which is exactly why a calendar is more reliable than a feeling here.
When to take longer
These figures are a floor, not a target. Take longer if the race was much hotter than you trained for, if you finished significantly slower than planned, if you are over 50, if the training block was long and heavy, or if anything hurts. None of those are reasons to feel behind: an extra week now costs less than an injury.
If you raced well below all-out — a marathon run as a training effort, a parkrun at tempo — pick the matching effort above and the schedule shortens accordingly.
Frequently asked questions
How long should I rest after a marathon?
Take about three days completely off, keep everything easy for a week or two after that, attempt a first hard session around two weeks in, and leave roughly four weeks before racing hard again. Older runners and hard finishes justify longer.
When can I run again after a half marathon?
A day or two off, then easy running only for about a week. A first quality session at around a week is reasonable and racing again after about two weeks, assuming nothing hurts.
Is it better to rest completely or keep moving?
Move, but not by running. Walking, easy cycling and swimming keep blood moving through damaged muscle and generally leave runners feeling better than total rest, without adding the impact that slows repair.