🥾 Naismith Hiking Pace Calculator

Enter horizontal distance (km) and total ascent (m) to estimate hiking time using Naismith's Rule.

Total Estimated Time

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Horizontal Time — Ascent Time Added —

⚠️ This Is an Estimate Only

Naismith's Rule assumes an average adult's walking pace and does not account for personal fitness, pack weight, weather, descent time, or breaks. Add buffer time for actual trip planning.

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What Is Naismith's Rule?

Naismith's Rule estimates hiking time from distance and ascent. This calculator uses distance ÷ base walking speed plus one hour per 600m ascent. The adjustable default is 5km/h, close to the original rule's 3mph pace.

Formula and Limitations

Horizontal time = Distance (km) ÷ 4
Ascent time = Total ascent (m) ÷ 600
Total time = Horizontal time + Ascent time

Because this rule is based on an average adult pace, beginners, heavy packs, bad weather, breaks, and descents should be factored in separately. For round-trip routes, gentle descents are usually treated at roughly the same pace as flat ground, while steep descents may warrant extra time.

Frequently asked questions

How accurate is Naismith's Rule?

It's a rule of thumb based on an average adult pace, so individual variation is significant. Treat it as a planning estimate and add buffer time for real trips.

Does this formula account for descent time?

The base formula only adds time for ascent. If your route includes a steep descent, add extra time separately.

What if my pace isn't 5km/h?

Change the base-speed input to your typical walking pace, then add a separate buffer for terrain, weather, and rests.