Hiking Time Calculator

Distance and elevation gain are the two numbers that most shape how long a hike takes, and feeding them into Naismith's Rule produces a workable time estimate for your trip. A dependable figure lets you budget daylight, pack the right supplies, and plan navigation with confidence. With outdoor recreation booming and trail usage across national parks projected to climb in 2026, getting that estimate right has real safety value.

Naismith's Rule, developed in 1892, assumes a baseline walking speed and tacks on extra time for climbing. Its standard form is: Time = (Distance in miles / 3 mph) + (Elevation Gain in feet / 2000 ft/hr). Run a 5-mile hike with 1000 feet of gain through it and you get (5/3) + (1000/2000) = 1.67 + 0.5 = 2.17 hours, a clean illustration of how the two terms combine.

The rule gives you a baseline, not the full picture, since it ignores personal fitness, trail conditions like mud, snow, or scrambling, and the breaks you'll actually take. Rough terrain and bad weather slow people more than they expect, and that gap between the clock and reality is where trouble starts. Build in a cushion on top of the calculated time, especially when your group includes less experienced hikers or you intend to linger at the views.