Free tool · trail time

Hiking time calculator

Enter the route from the map. Add one outing you have already done, and both estimates are scaled to your own pace.

An estimate for planning, not a promise. Weather, ground, pack, daylight and how you feel on the day decide the real time.

How the time is worked out

Naismith's rule: One hour for every 5 km on the map, plus one hour for every 600 m of climb.
Langmuir's descent corrections: On the way down, take off 10 minutes for every 300 m of descent where the slope is about 5° to 12°, and add 10 minutes for every 300 m where it is steeper than 12°. Below 5°, no change.
Tobler's hiking function: Walking speed W = 6 · e^(−3.5 · |S + 0.05|) km/h, where S is the slope as rise over run: about 5 km/h on the flat, fastest on a slight descent, slower both ways from there.
Without a map profile: The page has three numbers, not the shape of the route. So it splits the distance between the way up and the way down in proportion to the climb and the descent, and takes each part at its average slope. A route with long flat stretches and short steep ones will be slower than this.
Scaled to your outing: With a past outing, each method works out a time for it too. Your real time divided by that is your factor, and the new route's estimate is multiplied by it. The closer the outing is to the route (ground, pack, season), the better the factor.

Naismith, W. W. (1892). Scottish Mountaineering Club Journal. The rule as first written: an hour for every three miles, and an hour for every 2,000 feet of ascent.
Langmuir, E. (1984). Mountaincraft and Leadership (1984 edition). The descent corrections.
Tobler, W. (1993). Three Presentations on Geographical Analysis and Modeling. NCGIA Technical Report 93-1, University of California, Santa Barbara. The hiking function.