Shed

Free tool · Run walk

Run Walk Calculator

Enter your running pace, your walking pace and your interval ratio, and get the finish time and blended pace. It also shows what running it straight through would give you, which is the comparison that actually matters.

Estimated finish

4:31:06

Blended pace 10:20/mi.

The breakdown

  • Run / walk cycles

    4 minutes on, 1 off

    54

  • Time running

    3:36:53

  • Time walking

    54:13

  • If you ran it straight through

    At the same running pace, which most people cannot hold

    4:09:05

The straight-through figure is the comparison that matters. If you cannot hold your running pace for the whole distance, run-walk usually finishes faster, not slower.

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These numbers are the first 30 seconds of what Shed does.

Shed reads your Apple Health, grounds your VDOT in your actual training — not one race — and writes the whole block: every workout, every pace, adjusted as life happens. The calculator gives you a snapshot; Shed gives you the plan.

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Why it often finishes faster

The comparison people make in their heads is wrong. They compare run-walk against their fresh running pace held for the whole distance, and conclude that walking must cost time.

The honest comparison is against what you would actually average. A runner who sets off at 9:30 and is running 12:00 by mile 20 averages considerably worse than the same runner doing 9:30 with a minute of walking every four, held together to the finish. Taking the breaks early is what preserves the running pace late.

Who it is for

First marathons, anyone returning from injury, anyone running in heat, and anyone whose long runs consistently fall apart in the last quarter. It is also the standard tool for accumulating time on your feet at a lower impact load during a comeback.

It is not a beginner-only technique and it is not a failure. Plenty of experienced runners use it for ultras and for hot-weather races, for exactly the same reason: it protects the pace at the end by spending a little of it at the beginning.

Frequently asked

What is the run walk method?
Alternating running and walking on a fixed schedule from the start of a race rather than walking when you are forced to. It is most associated with Jeff Galloway, who has used it to get very large numbers of people to marathon finish lines.
What run walk ratio should I use?
It depends on your fitness and the distance. Common ratios run from 30 seconds running and 30 walking for beginners, through 2:1 and 4:1, to 9:1 for stronger runners. The general rule is that faster runners use longer run segments. Test it in training rather than picking one on race morning.
Is run walk actually faster?
Often, yes, for anyone who would otherwise slow substantially in the last third. The comparison that matters is not run-walk against your fresh running pace, it is run-walk against what you would actually average if you tried to run the whole thing. For many first-time marathoners the run-walk average is faster.
When should I take the walk breaks?
From the very start, on schedule, before you feel you need them. Starting the breaks at mile 18 because you are struggling is not the run-walk method, it is a slow collapse. The benefit comes from taking the breaks while you are still fresh.
Should I use it in training too?
Yes, on long runs at minimum. Walking mid-run is a skill: restarting running after a walk break feels different and takes practice. It also lets you accumulate time on your feet at a lower peak load, which is why it is useful for anyone coming back from injury.

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