Underestimating how long a hike will take is exactly how people end up finishing in the dark. Trail miles simply take longer than road miles do, and elevation gain adds a chunk of time that the distance figure alone will never show you.
The calculator below estimates flat walking time from your pace, then adds a fixed penalty for climb and your planned break time. Our note on planning a hiking route covers the wider process.
What Goes Into the Estimate
| Input | How it is used |
|---|---|
| Distance | Divided by your flat pace |
| Elevation gain | Thirty minutes per thousand feet added |
| Flat pace | Your speed on level ground |
| Break time | Added to moving time for a total |
| Descent | Not added, though it is not free |
| Terrain | Not modeled, and it can double everything |
Where the Climb Penalty Comes From
The whole approach of estimating flat walking time and then adding a fixed amount on for elevation goes back to a rule of thumb developed by a Scottish mountaineer back in the nineteenth century.
The original figure was an hour for every three miles plus an hour for every two thousand feet of ascent, which works out close to thirty minutes per thousand feet.
It has survived this long because it is roughly right for reasonably fit walkers on decent terrain, and because the arithmetic behind it is simple enough to do in your head on the trail.
Variations exist that adjust for fitness, load, and steepness, and none of them are dramatically better across the range of real hikes.
Treating the result as a starting figure to adjust from experience is more useful than looking for a more precise formula. Our roundup of trekking poles covers reducing the effort on climbs.
Choosing a Realistic Flat Pace
Three miles an hour is fairly brisk
Sustainable on good trail without a heavy pack.
Two and a half is a common default
Reasonable for most hikers over a full day.
Two is relaxed, or fully loaded
Groups, photographs, and heavier packs.
One and a half is rough terrain
Or a heavy multi-day load.
Descent Is Not Free
The calculation adds time for going up and nothing for coming down, which is the standard approach and a known simplification.
Gentle descent genuinely is faster than flat ground, which is why the rule ignores it.
Steep descent is an entirely different matter. It runs slower than flat walking, is considerably harder on the knees, and is where the majority of hiking injuries actually occur.
Loose surfaces make it worse, since scree and wet rock demand careful foot placement rather than a rhythm.
For a route with substantial steep descent, adding time rather than trusting the estimate is the safer approach. Our roundup of hiking boots covers footing on descents.
Terrain the Formula Ignores
Distance and elevation gain are the two things any map hands you easily, which is precisely why almost every time estimate gets built out of them.
They describe a graded trail well and describe almost nothing else accurately.
Boulder fields, loose scree, snow, deadfall, and unmaintained trail all slow progress in ways no elevation profile shows.
Stream crossings can take a surprising amount of time, particularly when they require finding a safe spot or changing footwear.
Route finding on faint or unmarked trail is easily the biggest hidden cost of all, since navigating eats up time that simply walking never does. Our note on navigating without GPS covers that skill.
Breaks Add Up Faster Than Planned
Moving time and total elapsed time diverge quite substantially over a long day, and the gap between them is almost always larger than anybody expected.
Short stops accumulate almost invisibly. Adjusting a boot, drinking, checking a map, and stopping for photographs are a few minutes each and happen dozens of times across a full day.
A proper lunch stop is thirty minutes or more, and stopping at a summit tends to run longer than planned.
Groups move slower than individuals do and take noticeably longer breaks, since the whole group ends up waiting on the slowest person at every single stop.
Entering a generous break figure produces a more honest total than an optimistic one. Our roundup of insulated water bottles covers staying hydrated without long stops.
Altitude and Heat Change the Numbers
Conditions affect pace more than the formula suggests, and two factors matter enough to plan around.
You can check when you would need to turn back before deciding.
Altitude reduces available oxygen, and a pace that feels easy at sea level becomes noticeably harder above roughly eight thousand feet for anyone not acclimatized.
That effect compounds with the climb penalty rather than replacing it, since a high route usually involves gain as well as elevation.
Heat forces slower movement and more frequent stops, and hiking through the middle of a hot day costs both pace and water.
Starting early is the standard response to both, since it puts the hardest climbing in cooler air and leaves margin at the other end of the day. Our roundup of electrolyte tablets covers hiking in heat.
Building In Daylight Margin
The single most useful thing you can do with any time estimate is compare it against the available daylight and then leave yourself real margin.
Finishing exactly at sunset means any delay puts you on trail in the dark, and delays are normal rather than exceptional.
Daylight shortens considerably outside summer, and canyons and dense forest go dark well before the official sunset time.
Turnaround times work considerably better than finish times on out-and-back routes, since setting a fixed time to head back regardless of progress removes the decision entirely at the point when you are tired.
A headlamp belongs in the pack regardless of how comfortable the estimate looks. Our roundup of headlamps covers the ones worth carrying.
Calibrating Against Yourself
Compare your estimates to actual times
Your own history beats any formula.
Adjust the flat pace, not the climb rate
Pace varies between people more than climb penalty does.
Note any conditions that slowed you
Snow, heat, and group size all show up later.
Expect to be slower with a full pack
Multi-day loads change pace noticeably.
Common Mistakes to Avoid
Using your road walking pace
Trail miles take longer, and uneven ground costs more than it looks.
Forgetting about the climb entirely
A thousand feet of gain adds roughly half an hour that distance never shows.
Badly underestimating break time
Short stops accumulate invisibly across a full day.
Planning to finish at sunset
Any delay then puts you on trail in the dark. Leave margin and carry a headlamp.
Recommended Reading
See our note on calculating pack weight, our roundup of water bottles for hiking, our note on staying dry in the rain, and a roundup of hiking shoes.
Hiking Time FAQ
How long will my hike take?
Distance divided by your flat pace, plus roughly thirty minutes per thousand feet of elevation gain, plus your break time.
Where does the climb penalty come from?
A nineteenth century rule of thumb from Scottish mountaineering, which works out close to thirty minutes per thousand feet and has survived because it is roughly right.
What flat pace should I use?
Two and a half miles an hour suits most hikers over a full day. Three is brisk without a heavy pack. Two or less for groups, rough terrain, or a loaded pack.
Why is descent not included?
Gentle descent is faster than flat, which is why the rule ignores it. Steep descent is slower and harder on knees, so add time for routes with a lot of it.
Does terrain matter?
Enormously, and the formula does not model it. Scree, snow, boulder fields, and route finding can easily double an estimate built on trail miles.
How much break time should I add?
More than you think. Short stops accumulate across a day, a lunch stop runs thirty minutes or more, and groups take longer breaks than individuals.
How do I make it more accurate?
Compare estimates against your actual times and adjust the flat pace. Your own history is better than any formula.
What if I am running late?
Set a turnaround time before you start and honor it regardless of progress. That removes the decision at the point where you are tired and least objective.
