Hiking Time Calculator

Estimate how long a hike will take from trail distance and elevation gain using Naismith's Rule.

Quick Facts

Method
Naismith's Rule: 5 km/h plus 1 hour per 600 m of ascent
Devised by William W. Naismith in 1892; estimates a fit hiker's moving time.

Your Results

Calculated
Estimated hiking time
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Total moving time (h:min)
Distance time
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Time for horizontal distance
Ascent time
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Extra time for climbing
Total time
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Decimal hours

Ready

Enter your trail distance and elevation gain, then calculate.

How the hiking time estimate works

This calculator uses Naismith's Rule, the classic mountaineering formula for estimating how long a walk on hilly terrain will take. It was devised in 1892 by the Scottish mountaineer William W. Naismith and remains the standard rule of thumb used in guidebooks, hillwalking courses, and mountain rescue planning.

The rule splits the estimate into two parts and adds them together:

  • Distance time: allow 1 hour for every 5 km of horizontal distance — a base walking pace of 5 km/h (about 3 mph). In this tool you can change the flat pace if you walk faster or slower.
  • Ascent time: add an extra 1 hour for every 600 m of total elevation gain. That works out to roughly 1 extra minute for every 10 m you climb, or about 30 minutes per 300 m of ascent.

The formula is simply:

Time (hours) = distance (km) ÷ pace (km/h) + ascent (m) ÷ 600

With the default 5 km/h pace, a 12 km walk with 600 m of climb comes out to 12 ÷ 5 = 2.4 hours for the distance plus 600 ÷ 600 = 1.0 hour for the ascent, giving 3.4 hours (3h 24m) of moving time.

Why elevation gain matters so much

Two trails of the same length can take very different amounts of time. A flat 10 km towpath at 5 km/h is a 2-hour walk. The same 10 km up a mountain with 1,000 m of ascent adds 1,000 ÷ 600 = 1.67 hours, making it a 3h 40m outing — nearly double. This is why hikers plan around total ascent, not just distance, and why the "ascent time" card in the results is often the deciding factor for a long day in the hills.

Handy reference points

  • 5 km / 100 m ascent: about 1h 10m — a short, easy loop.
  • 10 km / 300 m ascent: about 2h 30m — a typical half-day hill walk.
  • 20 km / 1,000 m ascent: about 5h 40m — a full-day mountain route.
  • Munro round (e.g. 15 km / 900 m): about 4h 30m of moving time before rests.

Metric and imperial equivalents

The traditional imperial statement of the rule is: allow 1 hour per 3 miles plus 1 hour per 2,000 feet of ascent. That is equivalent to the metric version here (5 km ≈ 3.1 miles; 600 m ≈ 1,969 ft). To convert your own figures: 1 mile = 1.609 km and 1 foot = 0.3048 m.

Frequently Asked Questions

What is Naismith's Rule?
Naismith's Rule, devised by Scottish mountaineer William Naismith in 1892, estimates walking time on hilly terrain: allow 1 hour for every 5 km (about 3 miles) of horizontal distance, plus an extra 1 hour for every 600 m (about 2,000 ft) of ascent. That is a base pace of 5 km/h plus roughly 1 minute for every 10 m climbed.
Does Naismith's Rule account for descent, rest, or fitness?
The basic rule assumes gentle descents cost no extra time and adds nothing for breaks, load, or fitness. It estimates a fit hiker's moving time on reasonable terrain. Add a fitness factor (Tranter's corrections) for slower parties, and add your own time for rest stops, food, navigation, rough ground, and steep downhill sections.
Is the estimate moving time or total trip time?
It is moving time only. A realistic plan for a full day adds lunch and snack breaks, photo and navigation stops, and buffer time for the group's slowest member. A common practice is to add 10–20 minutes of rest per hour of walking, then keep extra daylight in hand.
How should I adjust for steep descents or rough terrain?
Naismith's original rule ignores descent, but a widely used refinement subtracts about 10 minutes per 300 m of descent on gentle slopes (5°–12°) and adds about 10 minutes per 300 m on steep descents (over 12°), where careful footing slows you down. On boggy, rocky, or snow-covered ground, reduce your flat pace input to 3–4 km/h.

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