How Long Will Your Hike Take?

Underestimating hike duration is one of the top causes of backcountry emergencies. Use this calculator based on Naismith's rule to plan your hike safely.

Distance (miles)

Total trail distance one-way or round-trip.

Elevation Gain (feet)

Total elevation gain for the hike.

Fitness Level

Be honest - overestimating fitness is a common safety risk.

Terrain Type

Rough terrain significantly slows pace.

Pack Weight

Heavier packs slow you down and increase fatigue.

Expected Weather

Weather conditions affect pace and safety.

Methodology: Based on Naismith's rule (1 hour per 3 miles + 1 hour per 2,000 ft elevation gain), adjusted for fitness, terrain, pack weight, and weather using Tranter's corrections.

Frequently Asked Questions

What is Naismith's rule?

Naismith's rule is a formula from 1892 that estimates hiking time: allow 1 hour for every 3 miles (5 km) of distance plus 1 hour for every 2,000 feet (600 m) of elevation gain. It is the foundation for most hiking time estimates, adjusted for individual fitness and conditions.

Why do I need to estimate hiking duration?

Underestimating hike duration is a leading cause of backcountry rescues. Running out of daylight, water, or energy can turn a pleasant hike into a dangerous situation. Accurate time estimates help you plan water, food, and ensure you return before dark.

How can I stay safe on a hike?

Tell someone your route and expected return time. Carry the ten essentials (navigation, sun protection, insulation, illumination, first aid, fire, repair tools, nutrition, hydration, shelter). Set up an ImAlive daily check-in so someone is alerted if you do not return as expected.

Should I plan for extra time beyond the estimate?

Always add a 20-30% buffer to your estimated time. This accounts for rest breaks, photos, route-finding, and unexpected conditions. Start early in the day to ensure you have daylight margin. If your estimated time exceeds available daylight, choose a shorter route.