TDEE for Hiking: Elevation Changes Everything

A 70 kg hiker burns roughly 370 calories per hour on flat terrain — but add a 15 kg pack and 500 meters of elevation gain, and that number jumps to 650+ calories per hour. Elevation gain and pack weight are the two biggest calorie multipliers in hiking, and most hikers completely ignore both when estimating their energy expenditure. The difference between a flat nature walk and a loaded mountain ascent can be larger than the difference between jogging and sprinting.

How Hiking Affects Your TDEE

Hiking’s metabolic cost is driven by three variables that compound each other: walking speed, grade (incline), and load carried. On flat ground, hiking is essentially walking at MET 3.5-5.3 depending on pace. But the moment terrain tilts uphill, energy cost increases non-linearly. A 10% grade roughly doubles the MET value of flat walking. A 20% grade nearly triples it.

Pack weight adds another multiplier. Carrying 10 kg increases energy expenditure by approximately 15-20% compared to unloaded hiking at the same speed and grade. Carrying 20 kg adds 30-40%. The load is metabolically expensive because your muscles must not only propel you uphill but also stabilize and support the extra mass with every step.

The 2024 Compendium of Physical Activities captures this range clearly — hiking MET values span from 5.3 (general cross-country) to 7.8+ (uphill with a heavy pack).

Calorie Burn by Terrain and Load

MET values from the 2024 Adult Compendium of Physical Activities (Ainsworth et al., 2024):

Terrain/Condition	MET	60 kg	70 kg	80 kg	90 kg
Flat trail, no pack	5.3	318	371	424	477
Flat trail, 5-10 kg pack	5.8	348	406	464	522
Moderate uphill, no pack	6.0	360	420	480	540
Moderate uphill, 10-15 kg pack	6.8	408	476	544	612
Steep uphill, 10-15 kg pack	7.8	468	546	624	702
Scrambling/off-trail, heavy pack	8.0+	480	560	640	720
Downhill, moderate grade	3.5	210	245	280	315

Calories per hour. Formula: MET x body weight (kg) x 1.0 kcal/kg/hr.

Notice the downhill row. Descending burns significantly fewer calories than ascending — roughly 40-50% less at the same speed. However, downhill hiking generates more eccentric muscle damage, which increases recovery energy costs over the following 24-48 hours. This delayed cost does not appear in standard MET tables.

Flat vs Uphill vs Scrambling

The metabolic difference across hiking types is dramatic:

• Flat trail hiking (nature walks, canal paths): MET 5.3. Comfortable pace, sustainable for hours. This is closer to brisk walking than to exercise.
• Undulating terrain (rolling hills, 200-400 m elevation gain over a full day): MET 5.5-6.0 average. The ascents and descents roughly average out, but your heart rate spikes on uphills create more training stimulus than flat walking.
• Mountain hiking (500+ m elevation gain, sustained climbs): MET 6.5-7.8. This is genuine cardiovascular exercise. A 4-hour mountain hike with 800 m elevation gain can burn 2,000+ kcal for a 70 kg hiker.
• Scrambling and alpine terrain (hands-on-rock, steep off-trail): MET 8.0+. Metabolically approaching rock climbing territory. The intermittent high-intensity efforts (pulling yourself up, balancing on uneven terrain) push heart rate into anaerobic zones.

Which Activity Level Should You Select?

Hiking complicates TDEE calculations because frequency matters more than intensity for most hikers:

• Weekend hiker (1-2 hikes per week, 2-4 hours each): Select Lightly Active. Even strenuous weekend hikes do not offset 5 sedentary weekdays.
• Regular hiker (3-4 hikes per week or daily walking 60+ min): Select Moderately Active. Consistent hikers with active commutes or daily trail walks belong here.
• Thru-hiking or trekking (hiking 6-8 hours daily for days/weeks): Select Very Active to Extra Active. Multi-day backpacking trips with heavy packs at altitude are among the most calorie-demanding activities humans do. Thru-hikers on the Appalachian Trail average 4,000-6,000 kcal/day expenditure.
• Seasonal hikers (heavy hiking in summer, minimal in winter): Average your activity across the year or adjust your TDEE seasonally. Do not use your peak summer activity level during winter months when you are mostly sedentary.

Use our TDEE calculator and select the activity level that reflects your typical week across the whole month.

Nutrition Tips for Hikers

Calorie density is the most important nutritional concept for hikers. On long hikes, you need to carry your fuel, so the calories-per-gram ratio of your food matters as much as its nutritional profile.

• Short hikes (under 3 hours): No special nutrition needed beyond water. Your glycogen stores handle this.
• Day hikes (3-6 hours): Pack 200-300 kcal per hour of hiking. Trail mix, energy bars, and dried fruit deliver high calorie density (5-6 kcal/g) vs sandwiches (2-3 kcal/g).
• Multi-day backpacking: Target 1.5-2.0 kcal/g average across all food carried. Dehydrated meals, nut butters, olive oil additions, and chocolate meet this threshold. Fresh fruits and vegetables are mostly water weight — save them for car camping.

Altitude effects complicate appetite and nutrition above 2,500 m. Appetite typically decreases at altitude while energy demands increase (cold exposure, reduced oxygen efficiency). Force yourself to eat on schedule rather than by hunger at elevation. Carbohydrate-rich foods are preferred at altitude because carbs require less oxygen to metabolize than fats.

Hydration requirements for hiking are 500-1,000 ml per hour depending on temperature, humidity, and effort. Dehydration reduces hiking performance faster than calorie depletion — prioritize water over food on hot days.

Common Mistakes

1. Ignoring Elevation in Calorie Estimates

Using flat-trail MET values (5.3) for a hike with 600 m of elevation gain massively underestimates calorie burn. A mountain hike can burn 50-100% more calories per hour than the same distance on flat ground.

2. Not Accounting for Pack Weight

Your 15 kg backpack adds 15-20% to your energy expenditure. If you are calorie-counting for weight management and regularly hike with a loaded pack, ignoring this leads to consistent under-eating.

3. Treating All Hiking Days Equally

A 3-hour flat nature walk and a 6-hour mountain scramble are metabolically different activities by a factor of 3-4x in total calorie cost. Log them differently in your TDEE calculations rather than using a single “hiking” category.

References

1. Ainsworth BE, Haskell WL, Herrmann SD, et al. 2024 Adult Compendium of Physical Activities: An updated review of MET values. J Sport Health Sci. 2024.
2. Compendium of Physical Activities. pacompendium.com.
3. Pandolf KB, Givoni B, Goldman RF. Predicting energy expenditure with loads while standing or walking very slowly. J Appl Physiol. 1977;43(4):577-581.