Backpacking Food Weight Calculator
Calculate total food weight for your backpacking trip from calories per day, calorie density, and number of days.
Quick Answer
Standard thru-hike target: 1.5-2 lb of food per day at 125 calories per ounce, providing 3,000-4,000 calories. A 5-day trip totals 7.5-10 lb of food. Higher calorie density means less weight per calorie consumed.
Typical range: 100-150 cal/oz. Olive oil ~250, nuts ~170, freeze-dried meals ~130, snacks ~120.
Calorie Density Reference
About This Tool
The Backpacking Food Weight Calculator turns daily calorie needs into pounds of food on your back. The math is simple: total calories needed divided by calorie density (calories per ounce) gives you total food weight. The calculator does the conversions and gives you per-day breakdowns so you can fine-tune your resupply strategy and pack weight.
How Many Calories Do You Need?
Backpackers burn calories at a rate that surprises most newcomers. Moderate hiking burns 400-500 calories per hour, strenuous backpacking with elevation gain burns 600-800 per hour. A 10-hour hiking day at strenuous intensity burns 6,000-8,000 calories total when you add basal metabolic rate. Most hikers can't actually eat that much, especially in the first week. The deficit is fine for short trips but creates real performance and recovery problems on long trails.
The 1.5-2 lb Per Day Standard
Long-distance thru-hikers have converged on 1.5-2 lb of food per day as the practical sweet spot. Lower than 1.5 lb means either insufficient calories or unrealistically calorie-dense food (mostly oils and nuts, which gets old fast). Higher than 2 lb means you're carrying weight that won't fit in your stomach or your pack. At 125 cal/oz average density, 1.5 lb provides 3,000 calories and 2 lb provides 4,000 — bracketing the typical thru-hike target.
Why Calorie Density Matters
Every ounce on your back costs energy and impacts joint health. The math is dramatic: switching from 100 cal/oz food (think granola bars and jerky) to 150 cal/oz food (think nut butters and oils) saves 33% on food weight for the same calories. Over a 5-day carry, that's 2-3 lb less. The lightest, most efficient hikers don't eat less — they eat denser foods.
Building a Calorie-Dense Resupply
The strategy: anchor every meal with a high-density base, then add variety. Breakfast: 2 oz oatmeal mixed with 1 oz olive oil and 1 oz nut butter (650 cal in 4 oz). Lunch: tortillas + cheese + jerky + nuts (800 cal in 6 oz). Dinner: instant rice/noodles + olive oil + freeze-dried protein (700 cal in 5 oz). Snacks: bars, peanut butter packets, gummies, Snickers. Total: ~3,500 cal in 22 oz (1.4 lb) at 159 cal/oz. That's an aggressive but achievable target.
Resupply Cadence
Most thru-hikers resupply every 4-6 days. The cap is set by how much weight you can comfortably carry: 5 days at 1.75 lb/day is 8.75 lb of food, which adds significantly to total pack weight. Sections like the Sierra Nevada or the Bob Marshall Wilderness sometimes require 7-10 day carries. Map your resupply points to known trail towns or shipped boxes at post offices and hostels.
Avoiding Hiker Hunger
Around day 7-10 of a long trail, “hiker hunger” kicks in: appetite explodes as your body fully adapts to the calorie demand. Hikers who came in at 3,000 cal/day suddenly need 5,000+. Plan for this by ramping food weight as the trip progresses. Some hikers add 0.25 lb/day to each subsequent resupply for the first month. Town meals also matter: hit pizza, ice cream, and protein-heavy restaurants in resupply towns.
Trip Planning Tools
Pair this with our backpack weight calculator, our water needs calculator, our hiking time calculator, and our calorie burn calculator. For shelter sizing, see our tent capacity calculator.