Estimate how long a hike will take, from the distance covered and the total elevation gained.
How it works
Using Naismith’s Rule, allow 1 hour for every 5 km walked, plus 1 additional hour for every 600 m of ascent: time = distance ÷ 5 + ascent ÷ 600. A 10 km hike with 300 m of climbing takes about 2.5 hours by this estimate.
What this does not include
Naismith’s Rule is a long-standing approximation for a reasonably fit hiker on clear terrain — it doesn’t account for rest breaks, difficult or technical terrain, pack weight, weather, or descent time, all of which real hikes should add on top of this baseline estimate.
How to use this calculator
- Enter the hiking distance.
- Enter the total elevation gained (ascent).
A worked example
A 10 km hike with 300 m of ascent (using Naismith’s rule): estimated time = 2.5 hours.
A 15 km hike with 600 m of ascent: estimated time = 4 hours.
What the variables mean
| Variable | Meaning |
|---|---|
| Distance | Total hike distance, in kilometers |
| Ascent | Total elevation gain, in meters |
Edge cases worth knowing
Ascent adds meaningfully to hike time beyond distance alone. Naismith’s rule adds extra time for climbing, on top of the flat-ground pace — which is why the second example’s 50% longer distance combined with double the ascent produces a 60% longer estimated time, not just a proportional increase.
This is a baseline estimate, not a personalized prediction. Actual hiking speed varies with fitness, trail conditions, pack weight, and breaks — this formula gives a reasonable planning figure, not a guarantee.
Why does ascent count separately from distance?
Climbing uphill takes significantly more effort and time per unit of horizontal distance than walking on flat ground, so Naismith’s Rule adds ascent time on top of the base walking-distance estimate rather than folding it into a single pace figure.
Does this account for descent?
No — the classic rule focuses on ascent; some modern variants add extra time for very steep descents too, but that refinement isn’t included here.
How accurate is Naismith’s Rule in practice?
It’s a rough baseline meant for reasonably fit hikers moving continuously — actual hiking parties often add 25-50% more time for breaks, photography, difficult terrain, or a less experienced group.
