Planning a trail day? Enter the distance and elevation gain to estimate how long your hike will take — and what time you will be back. The calculator uses Naismith’s rule, the classic method used by hikers and mountain guides, with adjustments for pace, pack weight, terrain and breaks.
What is Naismith’s rule?
Created by Scottish mountaineer William Naismith in 1892, the rule allows 1 hour for every 3 miles (5 km) of walking plus 1 hour for every 2,000 feet (600 m) of ascent. Langmuir’s corrections later added time adjustments for gentle and steep descents.
Tips for planning your hike
- Set a turnaround time and stick to it.
- Check sunset time and carry a headlamp.
- Add extra time for photos, navigation and large groups.
- Bring the ten essentials — water, food, layers, map and first aid.
Frequently asked questions
How long does it take to hike 10 miles?
On flat trail, about 3 h 20 min of walking for an average hiker. Add 1 hour for every 2,000 ft of climbing, plus breaks.
Is Naismith’s rule accurate?
It is a good baseline for fit adults on decent trails. Beginners, heavy packs, heat, altitude and rough ground all add time — use the pace and terrain options.
Does going downhill save time?
Gentle downhill can speed you up, but steep descents are often slower than flat walking. Choose the descent adjustment that matches your route.