Estimate Hiking Time by Distance & Elevation
Calculate hiking time from trail distance, elevation gain, and fitness level. Naismith rule with adjustments.
Naismith's Rule for Hiking Time
The classic estimation: 3 mph on flat terrain + 30 minutes per 1,000 feet of elevation gain. An 8-mile hike with 2,000 feet of gain: 8÷3 + 1 = 3.7 hours for an average hiker. Adjust for fitness level, pack weight, terrain difficulty, and rest stops. This calculator applies modern corrections to Naismith's 1892 rule based on current hiking research.
Hydration and Safety
Water: Minimum 0.5 liters per hour of hiking, more in heat or at altitude. A 4-hour hike needs 2+ liters. The 10 Essentials: Navigation, sun protection, insulation, illumination, first aid, fire starter, repair tools, nutrition, hydration, emergency shelter. Even on short day hikes, carry enough water and a basic first aid kit.
The most dangerous hiking mistake is not turning back when conditions warrant it. Summit fever — the psychological drive to reach the top regardless of conditions — causes more outdoor fatalities than any other factor. Set firm turnaround times before you start and honor them regardless of how close the summit appears.
