Easy day (8-10 mi)2,500–3,200 kcal
Moderate (10-15 mi)3,200–4,000 kcal
Hard (15-20 mi)4,000–5,000 kcal
Extreme (20+ mi)5,000+ kcal
Target macros: 50–60% carbs, 25–35% fat, 15–20% protein for sustained energy. Aim for 100–125 cal/oz food density to minimize pack weight.