Backpacking Resupply Calculator: How Much Food Should You Carry?

It depends on trip length, individual energy needs, your food choices and how often you can get more. As a broad reference, REI's meal-planning guidance puts backpacking food per day at about 1.5 to 2.5 pounds (0.68 to 1.13 kg) per person, or roughly 2,500 to 4,500 calories. The Appalachian Trail Conservancy's resupply page offers 1.5 to 2 pounds a day as a starting point if your food is calorie-dense, and says hikers covering big miles or rugged terrain may need more.

Those are ranges, not targets for you. Someone covering long days on hard terrain needs a very different plan from someone on short stages with long breaks.

The basic food-weight formula

If you know the energy you plan to carry, you can estimate its weight from your menu's average calorie density:

Edible food weight (g) = planned food calories ÷ average calories per gram

Suppose your plan is 3,000 calories per full hiking day for four food-day equivalents, with a menu averaging 4.5 calories per gram. Planned energy is 3,000 × 4 = 12,000 calories, and the edible weight is 12,000 ÷ 4.5 = 2,667 g, about 2.67 kg. That is before extra food, packaging, fuel, water or storage gear. And the 3,000-calorie input is an example, not a personal requirement.

What a practical calculation separates

Cooking fuel, carried water and bear canisters are weighed separately. The goal is not the lowest possible food weight. It is a sufficient, appropriate and dependable food supply for your trip.

You can run this method in any spreadsheet. Enter your own inputs, and treat the outputs as numbers to review, not instructions.

This tells you nothing about how many calories you personally need, whether the next supply point is open, whether the food fits your canister, or whether the schedule is safe. Those are separate checks, covered below. Xploreum does not offer a food calculator, and Xavier does not work out calories, menus or carried weight.

Picture a seven-day trip. A simple calculation says carry seven days of food from the start. But if you have a dependable resupply after Day 4, your real strategy is two segments: trailhead to resupply town (four days) and resupply town to the finish (three days). You do not need to carry seven days of ordinary meals at departure. The number to calculate is the food carry between resupply stops, not the length of the whole trip.

Example: two hikers, two segments

Segment 1, per hiker. Planned energy is 4 × 3,000 = 12,000 kcal, and the extra allowance is 3,000 kcal, so 15,000 kcal in total. Edible weight is 15,000 ÷ 4.5 = 3,333 g. Add 120 g of packaging for 3,453 g, about 3.45 kg. For two hikers that is about 6.91 kg.

Segment 2, per hiker. Planned energy is 3 × 3,000 = 9,000 kcal, plus 3,000 kcal extra, so 12,000 kcal. Edible weight is 12,000 ÷ 4.5 = 2,667 g. Add 120 g for 2,787 g, about 2.79 kg. For two hikers that is about 5.57 kg.

The point is not the difference between the columns. Your food load follows the distance and time between dependable resupply opportunities, not the length of the whole vacation. All of this excludes water, fuel, the pack itself and storage gear.

Do not double-count emergency food

If you reach the second supply point with the extra food unused, you may be able to carry it forward, as long as it is still suitable and enough for the next segment. Buying an identical replacement without counting what is left adds weight for nothing. Your departure inventory and your shopping list are different calculations.

A four-day trip does not always mean four breakfasts, four lunches and four dinners. Say you eat breakfast before the trailhead, start hiking on the morning of Day 1, camp three nights, finish after lunch on Day 4 and eat dinner back in town.

Per hiker, that is 3 breakfasts, 4 lunches, 3 dinners, snacks for four hiking days and a separate contingency allowance. This is more precise than multiplying three meals by four days.

A sample inventory

These are invented portions chosen to demonstrate the arithmetic. They are not measured products, a validated menu or a nutritional recommendation.

The menu's average density is 10,900 ÷ 2,410 = about 4.52 kcal/g. If the hiker also carries 600 g of suitable contingency food providing 2,700 kcal and 160 g of packaging, the departure load is 2,410 + 600 + 160 = 3,170 g, about 3.17 kg per hiker, or about 6.34 kg for two.

That differs from the earlier four-day estimate because the meals and energy totals are different. Use the actual menu once you know it. Use day-based estimates only while planning provisionally. For menu ideas, see backpacking food ideas and a three-day meal plan.

Two packages can weigh the same and supply very different energy. A 100-gram portion with 450 calories is 450 ÷ 100 = 4.5 kcal/g, or 4.5 × 28.35 = about 128 calories per ounce.

Both give the same calories, but B weighs twice as much. On a short trip that barely matters. Over several days it changes your load.

Higher density is not automatically better. A menu also needs variety, nutritional adequacy, digestibility, food safety and food you will actually eat. REI's ultralight meal-planning guidance suggests aiming for at least 100 to 125 calories per ounce as a starting place, to be adjusted as you learn what works. Use package labels and real weights, and check whether the label describes the food as packaged or as prepared with added ingredients.

How to get your menu's actual density

1. List every item and the edible amount you carry.
2. Record the calories that amount provides.
3. Add up all calories and all edible weights.
4. Divide: average density = total menu calories ÷ total edible grams.

This weighted figure beats averaging item densities, because it accounts for how much of each food you carry. The USDA FoodData Central database can supply reference values, though composition and serving sizes vary.

There is no ideal interval. It depends on the trail, terrain, pace, food availability and what you can carry. The best-documented examples show how much it varies:

• Appalachian Trail. The Appalachian Trail Conservancy says resupply is frequent and most hikers carry about three to six days of food at a time. It adds that where road crossings are frequent, two to three days is common, while in Maine's 100 Mile Wilderness many hikers carry seven to ten days.
• Pacific Crest Trail. The Pacific Crest Trail Association's resupply strategy says you can generally buy food every four to ten days, and suggests mailing boxes only to a small number of remote locations.
• Remote routes. The interval may be set by access, not preference. If no practical road crossing or receiving business exists, you may carry more, adjust the route, arrange an authorized resupply or shorten the trip.

Those are trail-specific facts, not universal carry periods. To choose your own interval, ask where the next dependable source is, whether you can reach it from the trail, how many hiking days the real route needs, whether you can carry and legally store the load, and what happens if the supply point fails. Choose a reliable supply plan first, then use the calculation to see its consequences. Do not create a four-day interval because a calculator is set to four.

For longer hikes you must decide how you get the meals, not only how many you need.

Buy in trail towns. It is flexible, needs little pre-trip shipping and avoids unwanted packages after schedule changes. But selections can be limited, prices vary, specialty products may be missing, and shopping takes time and sometimes transport.

Mail boxes. You control specialty foods and depend less on small-store stock. But there is postage and possible receiving fees, collection-hour limits, shipping delays, a risk of loss and missed pickups when your schedule shifts. The PCTA advises arriving no more than about two weeks before your expected pickup date, notes that general delivery packages are held only about 15 days, and says to expect photo ID and possible handling fees at private hosts.

A hybrid. Buy where grocery access is reliable and mail packages where that solves a specific problem. The PCTA recommends this for many long-distance hikers.

The real cost

Compare more than the grocery bill. Local purchase is groceries plus transport to and from town plus any needed lodging. A mail drop is food bought beforehand plus packaging, shipping, receiving fees, collection transport and any lodging. A mailed box is not automatically cheaper, and the cheapest option is useless if you cannot collect it when needed. For the full planning method, read backpacking resupply planning: trail towns, mail drops and food carries.

Your shopping list and your pack inventory are different. Suppose you reach a resupply town with two unopened bars, one breakfast, some snacks and unused contingency food, and you are preparing a four-day segment.

Food to obtain = food needed for the next segment − suitable, usable food already carried

This has qualifications. Leftover food must still be safe, suitable for the next section and compatible with your storage rules. Do not eat into contingency food just to make the shopping list look smaller. Treat that as a separate decision.

The departure load is the number that matters. It also stops a calculation from counting an unused extra day as newly purchased at every stop.

Food is only part of a load that changes over a trip. Measure each of these separately.

• Packaging. Boxes, wrappers, pouches and bags add weight, so weigh them. Repackaging can cut weight and bulk but must not compromise food safety, and you should keep cooking instructions, food identity and allergen information.
• Stove fuel. It depends on the stove, fuel type, how much water you boil, the number of hot meals, the number of people, and temperature, wind and altitude. Knowing your calories does not tell you your fuel. Check current rules before mailing fuel or counting on buying it en route.
• Water. A liter of fresh water weighs about a kilogram. How much you carry depends on conditions, sources and treatment, and a dry section can add a lot of weight. Do not cut your water plan because your food math produced a heavy pack. Use verified water-source information and a treatment and reserve plan.

To estimate starting pack weight: base gear + packed food + fuel + carried water + other consumables. Avoid adding anything twice if your base-weight definition already includes it.

The math may say you can carry seven days of food. Will it fit the required storage system? In some places approved bear-resistant containers are mandatory. Yosemite, for example, requires approved canisters for food storage throughout its wilderness, and its food storage page counts drinks, trash, toiletries and medications along with food. Rocky Mountain National Park's overnight backpacking page requires a hard-sided, lockable bear-resistant canister for overnight wilderness trips. On the Appalachian Trail, the ATC strongly recommends carrying food in a bear-resistant container. Requirements vary by destination, so read your own.

Weight and volume are separate limits. A dense menu can be light and still too bulky, and bulky packaging can make storage hard. There is no reliable conversion from kilograms of food to liters of canister space, so run a physical test:

1. Assemble the full food supply for your longest segment, including contingency food.
2. Add the toiletries and other items that must be stored with food locally.
3. Pack everything into the approved container, and check that it closes and locks.
4. Confirm that every person in the group has legal storage capacity.

If it does not fit, the answer is not to ignore the rule. Reconsider packaging, approved containers, how gear is split across the group, or the resupply plan. The math can estimate weight. Only a packing test shows usable capacity.

Extra food covers plausible changes: an unexpected delay before the next resupply, a slower pace, a route change or a transport connection that falls through. Some agencies spell out a minimum. The ATC advises carrying enough food for the trip plus an extra day in case of delays, and Yellowstone's backcountry packing list asks for food for the trip plus one extra day. A park's checklist is not a universal rule that one day always suffices. The right amount depends on your destination, weather, remoteness and exit options.

Keep contingency food separate in your inventory, so you can tell planned consumption from reserves, and make it suitable for when you might need it. Food that needs hot water is little help if your stove fails. Extra food is one part of preparedness, not a substitute for navigation, communication, weather planning, safe exits and a decision about when to turn back.

For more precision, use one row per food item with these columns: item, number of portions, calories per portion, edible grams per portion, total calories, total grams. Then total calories = sum of portions × calories per portion, total edible weight = sum of portions × grams per portion, and average density = total calories ÷ total edible weight. Keep packaging, water, fuel and gear out of the edible-weight figure.

This is one of the most useful things to test. Your next planned supply is on Day 4, and you have your meals and departure weight worked out. Then an official trail closure changes the route and reaching the verified supply takes another full day.

Using the earlier inputs of 3,000 calories per food-day and 4.5 kcal/g, one extra food-day needs 3,000 ÷ 4.5 = about 667 g of edible food per hiker. For two hikers that is about 1.33 kg more, before packaging. That is only the numerical effect of one added day. The menu and individual needs still need review.

The schedule changes too. A longer segment can move where the group camps, permit dates, the expected arrival at the resupply point, store or post-office hours, water and fuel needs, and the return date. Adding food does not make a changed itinerary safe or feasible. If the revised trip needs more than the group can carry, store or obtain, the right call may be to change the plan. Ask whether the revised trip is feasible, not just how much extra food it needs.

Suppose your plan relies on buying food in a trail town after Day 3, and the store is closed.

1. What do we still have? Count actual portions and what is still safe to use.
2. What do we need? Work out normal needs to the next dependable supply, with an appropriate reserve.
3. Where else can we get it? Find a genuine supplier, not just another dot on a map.
4. Can we reach it? Consider transport, road access, business hours and the time to return to the route.
5. How does the change affect the itinerary? Review overnights, hiking stages, food, water and the way home.

A resupply problem is rarely just a grocery problem. It is a scheduling and logistics problem for the whole trip. For a step-by-step approach to verifying shops, mailed packages and town access, see planning a multi-day backcountry trip with campsites and resupply.

Working out the food is important. So is coordinating when and where you get it. Xploreum helps with the wider journey. Xavier, its AI agent companion, builds mapped, day-by-day outdoor itineraries called Xpeditions, which can organize hiking days, trailheads, overnights, supply towns, grocery stops, lodging and transport.

Xavier does not calculate backpacking nutrition, set daily calorie needs, generate detailed menus or work out carried food weight, and Xploreum has no food calculator. Do that math yourself first, with the method above.

A practical sequence:

1. Plan the route in a specialist mapping tool, with daily stages.
2. Identify resupply points. Check which real businesses or authorized pickup locations can supply you, and when.
3. Calculate food quantities for each segment from an actual meal inventory.
4. Build the Xpedition. Tell Xavier the route, duration, proposed overnights, supply locations and transport.
5. Review the whole itinerary so resupply timing matches the hiking and overnight schedule.
6. Verify official arrangements. Confirm permits, campsite authorizations, supplier services and transport independently.

A prompt to start with:

Help me organize a seven-day backpacking Xpedition with one resupply stop. We are [number] hikers following [route] from [starting trailhead] to [finishing trailhead]. The first segment is four days and the second is three. Our food quantities and carried weights are already calculated separately.

Proposed resupply: [business and location], expected arrival [date and time]. Overnight locations: [confirmed or proposed campsites]. Include trailhead transport, daily hiking stages, campsite details, the resupply visit, any town lodging and the return journey. Clearly separate proposed arrangements from verified or booked ones, and do not invent food inventory, business hours, campsite availability, water conditions or transport schedules. If the resupply date changes, help me review the effect on every later day.

This keeps the food plan connected to the larger schedule without implying that Xploreum calculated or verified it. Start planning your Xpedition with Xavier. To see how the tools fit together, read best apps for remote hiking with campsites and resupply and how to stop using five different apps to plan a remote hiking expedition.

Perishable food adds its own risk. The USDA's food safety guidance for hiking and camping recommends shelf-stable choices when you cannot keep food cold, and warns about the two-hour limit for perishables.

Food

• All planned meals and snacks are counted, including partial first and last days.
• The quantities meet the group's real planning needs.
• Extra food for plausible disruptions is recorded separately.
• Food weight and packaging have been checked.
• Food is shelf-stable or safely handled for the trip.
• Fuel and preparation water are planned.

Storage

• Current food-storage rules are checked.
• Any required bear-resistant container is approved.
• Food and other required scented items fit in the storage system.
• The group knows how to use it.

Resupply

• The next supplier is identified by name and exact location.
• Its services, stock or package acceptance are checked.
• Opening and collection hours match your expected arrival.
• Access between trail and supplier is feasible.
• Existing usable supplies are counted before shopping.
• A viable alternative exists if the resupply fails.

Whole trip

• Hiking stages and overnights are realistic, with permits and reservations in hand.
• Water sources and treatment are reviewed.
• Offline navigation is prepared, and a trusted contact knows your route and return.
• Official alerts and conditions were reviewed recently.

A backpacking resupply calculator answers one question: how much food do you plan to carry until the next reliable supply point? Its value comes from making the calculation visible. Count the meals you actually need. Use food weights and calories from real products. Keep contingency food apart from planned consumption. Compare your longest segment with your carrying and storage capacity. And confirm that every planned resupply can actually provide what you need.

A four-day hike and a four-day food carry are not necessarily the same thing, and a resupply plan is not complete because a grocery marker appears on a map. Calculate the food. Verify the supply. Coordinate the itinerary. Prepare for things to change.

To build the rest of the trip around it, chat with Xavier and start your next Xpedition.

Xploreum has a commercial interest in readers using its product. This guide does not describe a native Xavier meal-planning feature, and Xploreum has no food calculator. All sample inputs and quantities are illustrative. Nothing here determines personal calorie requirements or verifies individual resupply arrangements.

Sources were reviewed on October 24, 2026. The examples are illustrative and are not individual nutrition plans or verified route-specific supply arrangements.

• REI: Backpacking Food Ideas and Meal Planning. Accessed October 24, 2026.
• REI: Meal Planning for Ultralight Backpacking. Accessed October 24, 2026.
• USDA FoodData Central. Accessed October 24, 2026.
• USDA Food Safety and Inspection Service: Food Safety While Hiking, Camping and Boating. Accessed October 24, 2026.
• Pacific Crest Trail Association: Resupply strategy. Accessed October 24, 2026.
• Appalachian Trail Conservancy: Equipment and food resupply. Accessed October 24, 2026.
• Appalachian Trail Conservancy: Bears and food storage. Accessed October 24, 2026.
• National Park Service: Yosemite National Park, Food Storage While Backpacking. Accessed October 24, 2026.
• National Park Service: Rocky Mountain National Park, Wilderness Overnight Backpacking. Accessed October 24, 2026.
• National Park Service: Yellowstone National Park, Backcountry Camping. Accessed October 24, 2026.
• Xploreum: Product FAQ. Accessed October 24, 2026.