Hiking Calorie Calculator

This calculator provides a reasonable estimate based on MET (Metabolic Equivalent of Task) methodology, which is the standard scientific approach for estimating exercise energy expenditure. Actual calorie burn during hiking depends on many factors not captured by simple formulas: individual fitness level, body composition, hiking technique, trail surface, altitude, temperature, hydration status, and how often you stop. Expect accuracy within 15 to 25% of true expenditure for most hikers. For greater precision, a chest-strap heart rate monitor combined with your VO2 max provides better estimates.

A Metabolic Equivalent of Task (MET) is a ratio of exercise energy expenditure to resting energy expenditure. A MET of 1.0 equals the energy used sitting at rest (approximately 1 kcal per kg of body weight per hour). Hiking on flat terrain has a base MET of about 6.0 according to the Ainsworth Compendium of Physical Activities. This increases with steeper grades and heavier pack weight. Multiplying MET by body weight in kg and time in hours gives kilocalories burned.

Yes, meaningfully. A pack of 10 to 20 kg adds approximately 1.0 MET to your base hiking effort, while a pack over 20 kg adds approximately 2.0 MET. On a 3-hour hike at 70 kg body weight, this translates to an additional 210 to 420 calories burned compared to hiking without a pack. Military research and sports science studies confirm that load carriage is one of the most significant modifiers of hiking energy expenditure.

Elevation gain increases calorie burn significantly because ascending requires additional work against gravity. This calculator estimates the grade percentage from your elevation gain and distance, then adds 0.5 MET for every 2% of average grade. Steep terrain (grade above 15%) can more than double the calorie cost compared to flat hiking at the same pace. Additionally, descending steep terrain increases eccentric muscle load and can also increase calorie burn, though by a smaller amount.

This calculator estimates hiking time using standard assumptions: 4 km/h on flat terrain, 3 km/h on hilly terrain, and 2 km/h on steep terrain. These align with standard outdoor recreation planning guidelines. The popular Naismith's Rule adds 1 hour for every 600 m of elevation gain to the base travel time. Actual pace depends on individual fitness, trail conditions, rest stops, altitude, and group size. Trail difficulty ratings from land management agencies are the best source for specific trails.