Every packing list says the same thing: bring 1.5 to 2 pounds of food per person, per day. It’s not wrong, exactly. It’s an average smeared across days that don’t look anything alike — and if you pack to the average, one day you’re carrying dead weight and another you’re short.
Our gear weight budget calculator uses that same flat number: 0.7 kg, or about 1.5 lb, per day, because it has to assume something when you haven’t told it your itinerary. Fair enough for a quick pack-weight ceiling. Useless for deciding what actually goes in Tuesday’s food bag versus Friday’s.
The number that actually moves: effort, not days
Food is fuel, and fuel demand tracks the Pandolf equation — the 1977 US Army model our backpacking calorie calculator runs under the hood. Feed it body weight, pack load, walking speed, grade, and hours moving, and it spits out calories burned. Convert calories to food at roughly 4,000 kcal per kilogram (about 113 kcal/oz — typical for dense trail food) and you’ve got the day’s real number.
Take a 154 lb (70 kg) hiker carrying a 33 lb (15 kg) pack on dirt trail, run two days from the same trip:
| Day | Pace | Grade | Moving time | Calories burned | Food needed |
|---|---|---|---|---|---|
| Resupply-town approach | 2.9 mph | 2% | 4 h | ~1,500 kcal | ~0.8 lb |
| Summit push | 2.5 mph | 8% | 9 h | ~4,500 kcal | ~2.5 lb |
Three times the food, same hiker, same trip. That’s the gap the flat 1.5 lb rule papers over. Pack every day to the average and the summit-push day leaves you bonking on the last climb while the easy day hauls food you never touch.
What the calculator leaves out
Be honest about the limits here. That table is moving-time calories only — what you burn while your legs are actually working. It doesn’t add the calories you burn just existing for the other fifteen or sixteen hours of the day: making camp, digesting dinner, sleeping. Your real total is higher than either number above, and by more on the short day than the long one, since resting metabolism is a bigger share of a 4-hour day than a 9-hour one. Don’t treat the table as your grocery list. Treat it as the swing between days — the part a flat daily average can’t show you.
Packing to the swing, not the average
Don’t split food evenly across a trip with a big day in the middle. On the John Muir Trail, hikers who ration food evenly across a 13,000-foot Forester Pass day and a flat valley-floor day the same way tend to run short exactly where it hurts — on the climb, with the fewest calories in reserve and the longest hours left to hike.
Instead: run your itinerary’s hardest day and easiest day through the calorie calculator separately, and split your food bag unevenly to match. Front-load the climbing days with denser food — nut butter, cheese, olive oil — and let the short town-approach days carry less weight, not the same weight.
If you don’t have grade and mileage nailed down yet, trace the route in our route planner first; elevation gain per day is the one number in this whole calculation you can’t estimate from memory.
The honest bottom line
1.5 lb a day is a fine number for a gear closet spreadsheet. It’s a bad number for Tuesday’s food bag if Tuesday is the day you climb 4,000 feet. Run the actual day. Pack the actual number. Save the average for the grocery list, not the trail.