What this hiking calorie calculator does
This calculator estimates calories burned during hiking using the MET (Metabolic Equivalent of Task) formula - the gold standard used by exercise physiologists and the 2011 Compendium of Physical Activities. Enter your body weight and how long you exercised; the calculator multiplies the activity's MET value by your weight (kg) and time (hours) to estimate kcal burned. Higher intensity = higher MET = more calories burned per minute.
Intensity guide for accurate results
Pick the intensity that matches what you actually did - not what you wished you did. Each hiking intensity has a specific MET value from peer-reviewed research. If you alternated paces (e.g., interval training), pick the average. For more precise tracking, use a heart rate monitor and the Heart Rate Calorie Calculator on HisabWeb - it accounts for individual cardiovascular response, which the MET method approximates.
What is MET (Metabolic Equivalent)?
MET = the energy cost of an activity relative to sitting quietly. 1 MET ≈ 3.5 mL O2 per kg of body weight per minute, or approximately 1 kcal per kg per hour at rest. Sitting = 1 MET; walking slowly = ~2.5 MET; running fast = ~13 MET. The Compendium of Physical Activities (Ainsworth et al., 2011) catalogs 821 activities with their MET values from oxygen-consumption studies. Multiplying MET × weight × time gives a robust calorie estimate for adults.
Why body weight matters
Heavier bodies burn more calories doing the same activity - more mass to move means more energy. A 90 kg person burns ~29% more calories than a 70 kg person doing the same workout. The MET formula scales linearly with weight, so accurate weight input is critical. Tip: use your current weight, not your goal weight, for the most realistic estimate.
Accuracy & limitations
MET estimates typically come within ±15-20% of metabolic-cart-measured values for moderate-intensity activities. Sources of variability: individual VO2max, body composition (more muscle = higher BMR), exercise efficiency (trained athletes burn fewer calories at the same speed), terrain, equipment, and even temperature. For more precision, use a heart-rate-based estimate (Keytel formula) or a metabolic cart in a lab.
Frequently asked questions
Significantly. The MET for uphill hiking with a backpack (~7.8) is ~30% higher than without. A 10 kg pack on a 70 kg hiker effectively adds to body weight, scaling calorie burn proportionally. For long expeditions, expect 5,000-6,000+ kcal/day - this is why thru-hikers need to eat constantly.
Hugely. Flat trail = 5.3 MET, cross-country moderate = 6.0 MET, uphill = 7.0 MET, uphill with pack = 7.8 MET, mountain climbing = 8.5 MET. Soft surfaces (sand, snow) add another 30-50% energy cost. Always log the actual conditions, not the average MET, for accurate estimates.
Hiking is gentler on joints (lower impact than running), trains stabilizing muscles (uneven terrain), and burns similar calories to moderate running over an hour. Running is more time-efficient (more cal/min). For overall health and longevity, both are excellent - choose what you'll do consistently.
Sources
- 2011 Compendium of Physical Activities: A Second Update of Codes and MET Values— Ainsworth et al., Medicine & Science in Sports & Exercise, 2011;43(8):1575-1581
- Physical Activity Guidelines for Americans (2nd edition)— US Department of Health and Human Services
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