How long will your hike take? This calculator estimates hiking time using Naismith’s rule with Langmuir’s descent corrections — factoring distance, elevation gain, terrain, and rest stops, and giving you a finish time for safe trip planning.
Estimate how long a hike will take with Naismith’s rule and Langmuir’s descent corrections — accounting for climbing, terrain, and rest.
Where the time goes
How this is calculated
How long does it take to hike? Quick reference
Estimated hiking time (moving, no long breaks) at a steady 3 mph on moderate trail, by distance and total climbing:
| Distance | Flat | Moderate (1,000 ft) | Big climb (2,500 ft) |
|---|---|---|---|
| 3 mi | 1:06 | 1:29 | 2:55 |
| 5 mi | 1:50 | 2:24 | 2:48 |
| 8 mi | 2:56 | 3:30 | 3:54 |
| 12 mi | 4:24 | 4:58 | 5:48 |
Computed with the same Naismith + Langmuir method as the calculator. Your time will vary with fitness, pack weight, terrain, and rest stops — use the calculator above for your route.
How this calculator works
The estimate is built on Naismith’s rule, the time-tested hill-walking formula: allow roughly 1 hour per 3 miles (5 km) of distance, plus an extra hour for every 2,000 ft (600 m) of ascent. A terrain factor scales this up for rough or off-trail ground.
It then applies Langmuir’s corrections for the descent: gentle downhills (about 5–12°) are quicker than flat walking, so time is subtracted, while steep downhills (over 12°) demand careful footing and braking, so time is added. Finally, your rest and break time is added to give a realistic total — and, if you enter a start time, an estimated finish time.
Plan for safety
Always treat the result as a planning estimate and add a margin. Aim to finish with daylight to spare, carry the Ten Essentials (including a headlamp), and on an out-and-back set a firm turnaround time. On steep climbs, power hiking and trekking poles help maintain pace, and tracking vert and elevation gain builds your sense of realistic timing.
Frequently asked questions
How long does it take to hike a mile?
On flat, easy trail most people walk a mile in 20–30 minutes (2–3 mph). But hiking time depends heavily on elevation: a mile with significant climbing can take far longer, because every 1,000 ft (≈300 m) of ascent adds roughly half an hour on top of the flat-distance time. Enter your route above for an estimate.
What is Naismith's rule?
Naismith's rule is a classic method for estimating hill-walking time, devised by Scottish mountaineer William Naismith in 1892. It allows about 1 hour for every 3 miles (5 km) of distance, plus an extra hour for every 2,000 ft (600 m) of ascent. This calculator uses Naismith's rule with Langmuir's descent corrections and a terrain factor for a more realistic estimate.
How much does elevation gain slow you down?
A lot. Climbing is far more time-consuming than covering flat distance — Naismith's rule adds about an hour for every 2,000 ft (600 m) you ascend, regardless of how short the horizontal distance is. That's why a steep 5-mile hike can take longer than a flat 10-mile one. The calculator costs your climbing separately from your distance.
Does going downhill make a hike faster?
Sometimes. Gentle descents (about 5–12°) actually save time versus flat walking, which is why Langmuir's correction subtracts time there. But steep descents (over 12°) slow you down, because careful footing and braking take effort and time — so the calculator adds time on steep downhills rather than treating them as free speed.
How accurate are hiking time calculators?
They give solid planning estimates, not guarantees. Naismith-based estimates assume reasonable fitness and steady conditions; your real time varies with fatigue, pack weight, weather, trail conditions, navigation, photo stops, and group size. Always add a safety margin and plan to finish with daylight to spare — carry a headlamp regardless.