Work out trekking calorie needs instantly with clear inputs, formula shown and shareable results.
Trekking energy demand is resting metabolism plus activity, where activity uses MET values weighted by total carried mass — body plus pack. Mountain walking at 8 METs with a loaded pack easily reaches 4,000-5,000 kcal a day, which is why long treks cause weight loss.
Trekking calories
kcal = BMR + MET x (body + pack weight) x hours; food weight at roughly 4000 kcal per kg
Because weight is the constraint. Aim for 4,000-5,000 kcal per kilogram of food: nuts, oils and dried fats rather than bulky low-density foods.
Rarely. Most trekkers run a deficit of 500-1,500 kcal a day, which is sustainable for a few weeks but requires planning on longer expeditions.