Hiking, Camping & Trail Planning Calculation Guide
Trail time, pack weight, water, fuel, altitude, and weather estimates for safer trips.
📚 Overview
Most trouble on the trail comes from planning gaps: a hike that takes longer than expected, too little water or fuel, a pack that is too heavy, or a climb that gains altitude too quickly. A few simple formulas turn distance, climbing, temperature, and group size into numbers you can plan around, so you carry what you need and start early enough to finish in daylight.
📐 Naismith Rule for Hiking Time
Allow one hour for every 5 km walked and one more hour for every 600 m climbed, then add a percentage for rests. Slow the speeds for heavy packs, rough ground, snow, or a tired group.
🔢 Worked Example
Scenario: Planning a 15 km hike with 900 m of total climbing, a 10 percent allowance for rests, and a sunset at 18:30.
- Distance: 15 km
- Ascent: 900 m
- Flat speed: 5 km/h, climbing rate: 600 m/h
- Rest allowance: 10 percent
- Distance time = 15 / 5 = 3 hours
- Climbing time = 900 / 600 = 1.5 hours
- Moving time = 3 + 1.5 = 4.5 hours
- Total with rests = 4.5 × 1.10 = 4.95 hours, which is 4 h 57 min
💡 Pro Tips
- Weigh your loaded pack with water and food, and aim for about 20 percent of body weight or less on multi-day trips.
- Carry water for the longest gap between sources, plus a reserve, and plan on about 0.4 to 0.8 L per hour depending on heat and effort.
- Above 3,000 m, raise your sleeping elevation by no more than about 500 m per day and add rest days.
- Wind chill and summit temperatures can be far colder than the trailhead forecast, so pack layers for the coldest likely conditions.
🧮 Hiking & Camping Calculators (15)
Put the formulas above into practice with these free tools:
Estimate how long a hike takes from distance and total climbing.
Check your loaded pack weight against a body-weight guideline.
How much water to carry for a hike, by time, heat, and effort.
Gas fuel and canisters needed to boil water for a trip.
Food weight to pack from calories, days, and food energy density.
Check whether a tent has enough floor area for your group and gear.
Boiling temperature of water at any elevation.
How much oxygen is available at a given elevation.
❓ Frequently Asked Questions
How accurate is the Naismith Rule?
It is a reliable baseline for fit walkers on good paths. Real time varies with terrain, load, weather, and fitness, so adjust it using your own pace from past hikes.
How much water should I carry while hiking?
A common starting point is about 0.5 L per hour in mild weather. You need more in heat, at altitude, or during hard climbing. Always plan for the longest stretch without a refill.
Why does water boil at a lower temperature on mountains?
Air pressure falls with elevation. Water boils when its vapor pressure matches the surrounding air pressure, so it boils at roughly 3 °C less for every 1,000 m you gain.