How Long Will My Hike Take?
Distance alone badly underestimates hiking time on anything but flat ground, because climbing is slow. Naismith's rule, a century-old estimate, fixes this: allow your normal walking time for the horizontal distance, then add roughly one hour for every 2,000 feet of ascent.
Distance plus climb
A flat 8-mile walk at 3 mph takes under three hours, but add 2,000 feet of climbing and you're closer to four. The calculator separates the two so you can see how much the elevation is costing you. Descents can add time too on steep or technical ground, though Naismith's classic form ignores them.
Adjust for reality
Naismith assumes fit hikers on good trails in fair conditions. Groups move at the pace of the slowest member, heavy packs slow everyone, and snow, mud, scrambling, or altitude can add 25-50% or more. Treat the estimate as a fast-day baseline and pad generously when planning turnaround times or daylight — running out of light is far worse than arriving early.
Frequently asked questions
- How do I estimate hiking time?
- Use Naismith's rule: your walking time for the distance plus about an hour per 2,000 feet of climb.
- Does elevation really matter that much?
- Yes — climbing is slow. A couple thousand feet of gain can add an hour or more to a modest hike.
- Should I add buffer time?
- Absolutely. Add 25-50% for groups, heavy packs, rough terrain, or bad conditions.