Backpacking Calculate Base Weight

Backpacking Base Weight Calculator: Optimize Your Pack :root { –primary-color: #004a99; –success-color: #28a745; –background-color: #f8f9fa; –text-color: #333; –border-color: #ccc; –card-background: #fff; –shadow: 0 4px 8px rgba(0,0,0,0.1); } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(–background-color); color: var(–text-color); line-height: 1.6; margin: 0; padding: 0; } .container { max-width: 960px; margin: 20px auto; padding: 20px; background-color: var(–card-background); border-radius: 8px; box-shadow: var(–shadow); } h1, h2, h3 { color: var(–primary-color); text-align: center; margin-bottom: 1.5em; } h1 { font-size: 2.5em; } h2 { font-size: 1.8em; border-bottom: 2px solid var(–primary-color); padding-bottom: 0.5em; margin-top: 2em; } h3 { font-size: 1.4em; margin-top: 1.5em; } .calculator-wrapper { background-color: var(–card-background); padding: 25px; border-radius: 8px; box-shadow: var(–shadow); margin-bottom: 30px; } .input-group { margin-bottom: 20px; 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Backpacking Base Weight Calculator

Optimize your gear by understanding and reducing your base weight.

Backpacking Base Weight Calculator

Weight of your tent, tarp, bivy, or hammock system (kg).
Weight of your sleeping bag or quilt (kg).
Weight of your sleeping pad (kg).
Weight of your empty backpack (kg).
Weight of your stove, pot, utensil, and fuel (kg).
Weight of your water treatment system (kg).
Weight of pots, pans, mugs, cutlery, and food bags (kg).
Weight of spare clothing, insulation layers, rain gear (kg).
Weight of toiletries, sunscreen, bug spray, and first-aid kit (kg).
Weight of items like headlamp, power bank, knife, repair kit (kg).
Weight of clothes, boots, hat you'll wear (kg).
Average weight of food per day (kg).
Weight of water per liter (approx. 1 kg/L).
Number of days for your trip.

Your Backpacking Metrics

0.00 kg
Base Weight = Sum of all gear EXCEPT food, water, and fuel.

Base Weight: 0.00 kg

Total Gear Weight (excluding consumables): 0.00 kg

Estimated Pack Weight (per day): 0.00 kg

Estimated Total Trip Weight (Day 1): 0.00 kg

Results copied to clipboard!
Base Gear | Consumables (Food & Water)
Breakdown of Estimated Pack Weight on Day 1

Weight Component Breakdown (Estimated for Day 1)

Item Category Weight (kg)
Tent/Shelter0.00
Sleeping Bag/Quilt0.00
Sleeping Pad0.00
Backpack0.00
Stove & Fuel0.00
Water Filter/Purifier0.00
Cookware & Food Storage0.00
Clothing (non-worn)0.00
Toiletries & First Aid0.00
Miscellaneous Gear0.00
Base Weight Subtotal0.00
Food (Day 1)0.00
Water (Initial Carry)0.00
Estimated Total Pack Weight (Day 1)0.00
Weights are estimates for your first day of a trip.

Backpacking Base Weight: Your Key to Lighter Hikes

{primary_keyword} is a fundamental concept for any backpacker aiming for a more enjoyable and less strenuous outdoor experience. Understanding your {primary_keyword} allows you to meticulously plan your gear, identify unnecessary weight, and ultimately make your adventures more accessible. This guide will delve deep into what {primary_keyword} entails, how to calculate it, and why it's crucial for successful backpacking trips.

What is Backpacking Base Weight?

Backpacking base weight refers to the total weight of your backpack and all the gear you carry, excluding consumables like food, water, and fuel. It represents the essential equipment needed for survival, shelter, navigation, and comfort on the trail. Think of it as the "dead weight" you carry regardless of how long your trip is or how much food you pack.

Who Should Use This Concept?

Anyone who carries a backpack for overnight or multi-day trips can benefit from understanding and calculating their base weight. This includes:

  • Thru-hikers: For long-distance journeys where every ounce counts, optimizing base weight is paramount for endurance and speed.
  • Weekend Backpackers: Even for shorter trips, a lower base weight can significantly improve comfort and reduce fatigue.
  • Section Hikers: Similar to thru-hikers, reducing base weight on extended treks aids in sustained effort.
  • Ultralight Backpackers: This is a core philosophy for ultralight enthusiasts aiming for the absolute minimum pack weight.
  • Beginner Backpackers: Understanding base weight early can help avoid overpacking and developing bad habits.

Common Misconceptions about Base Weight

Several myths surround {primary_keyword}. It's important to clarify:

  • Base weight is NOT total pack weight: Many people confuse base weight with the total weight they carry on a specific trip. Remember, consumables (food, water, fuel) are *added* to your base weight.
  • Ultralight is always best: While reducing weight is beneficial, sacrificing essential safety or comfort items can be detrimental. The goal is *optimal* weight, not just *minimum* weight.
  • It only applies to experienced hikers: Beginners benefit greatly from understanding {primary_keyword} to avoid bringing too much.
  • It's about expensive gear: While some ultralight gear is costly, significant weight reduction can be achieved through careful selection, smart packing, and leaving non-essentials behind, regardless of budget.

Backpacking Base Weight Formula and Mathematical Explanation

Calculating your {primary_keyword} is straightforward. It involves summing the weights of all your essential gear items. The core formula is:

Base Weight = Σ (Weight of all essential gear items)

Variable Explanations

Let's break down the components that contribute to your base weight:

  • Shelter System: Tent, tarp, bivy sack, hammock, stakes, guylines, footprint.
  • Sleep System: Sleeping bag or quilt, sleeping pad, pillow (if carried).
  • Backpack: The empty pack itself, including any attached hip belt pockets or rain covers.
  • Kitchen/Water: Stove, fuel canister, pot, mug, spoon, water filter/purifier, water bottles/bladder (empty).
  • Clothing: All spare clothing items, extra layers, rain gear, hats, gloves (excluding what you are wearing).
  • Navigation: Map, compass, GPS device.
  • Safety/First Aid: First-aid kit, headlamp/flashlight, repair kit, knife, fire starter.
  • Hygiene/Toiletries: Toothbrush, toothpaste, trowel, toilet paper, sunscreen, bug spray.
  • Miscellaneous: Trekking poles, power bank, camera, cordage, sunglasses.

Items specifically excluded from base weight are typically considered consumables:

  • Food: All packaged meals, snacks, and other provisions.
  • Water: The weight of the water you carry.
  • Fuel: The weight of the fuel in your canister or bottle.

Variables Table

Variable Meaning Unit Typical Range (kg)
Shelter WeightWeight of tent, tarp, or hammock system.kg0.5 – 3.0
Sleeping Bag/Quilt WeightWeight of insulation for sleeping.kg0.4 – 1.5
Sleeping Pad WeightWeight of insulating pad.kg0.2 – 0.8
Backpack WeightWeight of empty pack.kg0.7 – 2.5
Stove & Fuel WeightWeight of cooking system and fuel.kg0.1 – 0.7
Water Filter/Purifier WeightWeight of water treatment device.kg0.05 – 0.3
Cookware & Food Storage WeightPots, utensils, food bags.kg0.1 – 0.5
Clothing Weight (non-worn)Extra layers, rain gear.kg0.3 – 2.0
Toiletries & First Aid WeightHygiene items, medical supplies.kg0.1 – 0.5
Misc. Gear WeightHeadlamp, poles, tools, electronics.kg0.2 – 1.5
Worn Items WeightClothes, boots worn during hike.kg1.5 – 4.0
Food Weight (per day)Average daily food weight.kg0.6 – 1.5
Water Weight (per liter)Weight of water.kg~1.0
Trip DurationNumber of days on the trail.Days1 – 30+
Base WeightTotal essential gear weight (excluding consumables).kg3.0 – 10.0+
Total Pack WeightBase Weight + Consumables.kg7.0 – 20.0+

Practical Examples (Real-World Use Cases)

Let's see how {primary_keyword} plays out with practical scenarios:

Example 1: Ultralight Weekend Trip

Sarah is planning a 2-day solo trip in the mountains. She focuses on keeping her gear light.

  • Shelter: 1.1 kg
  • Sleeping Bag: 0.7 kg
  • Sleeping Pad: 0.4 kg
  • Backpack: 0.9 kg
  • Stove & Fuel: 0.2 kg
  • Water Filter: 0.1 kg
  • Cookware/Food Storage: 0.15 kg
  • Clothing (non-worn): 0.4 kg
  • Toiletries/First Aid: 0.15 kg
  • Misc Gear: 0.3 kg
  • Worn Items: 1.8 kg
  • Food (2 days @ 0.8 kg/day): 1.6 kg
  • Water (initial carry, 2L): 2.0 kg
  • Trip Duration: 2 days

Calculation:

Base Weight = 1.1 + 0.7 + 0.4 + 0.9 + 0.2 + 0.1 + 0.15 + 0.4 + 0.15 + 0.3 + 1.8 = 6.1 kg

Total Pack Weight (Day 1) = Base Weight + Food (Day 1) + Water (Initial) = 6.1 kg + 0.8 kg + 2.0 kg = 8.9 kg

Interpretation: Sarah has achieved a very respectable ultralight base weight of 6.1 kg. Her starting pack weight of 8.9 kg for a 2-day trip is excellent, allowing for comfortable hiking.

Example 2: Standard 5-Day Trip with a Partner

John and Maria are going on a 5-day trip. They share some items but each carry their own essentials.

  • Shelter (shared tarp): 1.0 kg
  • John's Sleeping Bag: 1.0 kg
  • Maria's Sleeping Bag: 0.9 kg
  • John's Sleeping Pad: 0.6 kg
  • Maria's Sleeping Pad: 0.5 kg
  • John's Backpack: 1.5 kg
  • Maria's Backpack: 1.3 kg
  • Shared Stove & Fuel: 0.5 kg
  • Shared Water Filter: 0.2 kg
  • Shared Cookware/Food Storage: 0.3 kg
  • John's Clothing (non-worn): 0.8 kg
  • Maria's Clothing (non-worn): 0.7 kg
  • John's Toiletries/First Aid: 0.3 kg
  • Maria's Toiletries/First Aid: 0.25 kg
  • John's Misc Gear: 0.6 kg
  • Maria's Misc Gear: 0.4 kg
  • John's Worn Items: 2.5 kg
  • Maria's Worn Items: 2.0 kg
  • Food (5 days @ 1.0 kg/day): 5.0 kg
  • Water (initial carry, 2L each): 4.0 kg
  • Trip Duration: 5 days

Calculation (per person average, approximate):

Sum of all shared items: 1.0 (shelter) + 0.5 (stove) + 0.2 (filter) + 0.3 (cookware) = 2.0 kg

Sum of John's individual items: 1.0 + 0.6 + 1.5 + 0.8 + 0.3 + 0.6 + 2.5 = 7.3 kg

Sum of Maria's individual items: 0.9 + 0.5 + 1.3 + 0.7 + 0.25 + 0.4 + 2.0 = 6.05 kg

Total Gear Weight (excluding consumables) = Shared Items + John's Individual + Maria's Individual = 2.0 + 7.3 + 6.05 = 15.35 kg

Average Base Weight per person = Total Gear Weight / 2 = 15.35 kg / 2 = 7.675 kg (let's round to 7.7 kg)

Average Food Weight per person (per day) = 5.0 kg / 2 people / 5 days = 0.5 kg/person/day

Average Water Weight per person (initial) = 4.0 kg / 2 people = 2.0 kg/person

Estimated Total Pack Weight (Day 1, per person) = Average Base Weight + Food (Day 1) + Water (Initial) = 7.7 kg + 0.5 kg + 2.0 kg = 10.2 kg

Interpretation: John and Maria have an average base weight of 7.7 kg. While not ultralight, this is a reasonable weight for a 5-day trip, especially considering they might be carrying slightly heavier, more durable gear. Their starting pack weight of ~10.2 kg is manageable.

How to Use This Backpacking Base Weight Calculator

Our calculator simplifies the process of determining your {primary_keyword} and understanding your total pack weight. Follow these simple steps:

Step-by-Step Instructions

  1. Gather Your Gear Weights: The most crucial step is accurately weighing each of your individual gear items. Use a kitchen scale or a luggage scale. Weigh items individually rather than in groups.
  2. Input Data: Enter the weight for each category into the corresponding field in the calculator. Be precise! If an item category isn't applicable (e.g., you don't use a stove), enter '0'.
  3. Specify Trip Details: Enter the planned number of days for your trip and the average food weight you plan to carry per day.
  4. Initial Water Load: Estimate the initial amount of water you'll carry at the start of your trip (e.g., 2 liters). Remember, 1 liter of water weighs approximately 1 kg.
  5. Calculate: Click the "Calculate Base Weight" button.

How to Read Your Results

  • Primary Result (Base Weight): This is the highlighted number showing the total weight of your essential gear. Aim to keep this as low as feasible for your needs.
  • Total Gear Weight (excluding consumables): This is the same as Base Weight, just a different label for clarity.
  • Estimated Pack Weight (per day): This shows the average weight of gear *plus* food you'd carry each day.
  • Estimated Total Trip Weight (Day 1): This is your total starting weight on the first day, including your Base Weight, the first day's food, and your initial water carry. This is the heaviest your pack will be.
  • Breakdown Table: Provides a detailed view of how much each gear category contributes to your base weight.
  • Chart: Visually represents the proportion of your gear weight versus consumables for Day 1.

Decision-Making Guidance

Use your calculated {primary_keyword} to make informed gear decisions:

  • Identify High-Weight Items: If your shelter or backpack contributes significantly to your base weight, consider lighter alternatives if budget and needs allow.
  • Evaluate Necessity: Does that extra camp chair or book really need to come along? Question the weight of every item.
  • Compare Options: Use the calculator to compare the impact of different gear choices on your overall base weight.
  • Set Goals: If your base weight is high (e.g., over 10 kg for a typical multi-day trip), set a target for reduction.

Key Factors That Affect Backpacking Base Weight Results

While the calculation itself is simple addition, several factors influence the *quality* and *outcome* of your {primary_keyword} assessment:

  1. Gear Material & Design: Lighter materials (titanium, Dyneema Composite Fabric, down insulation) significantly reduce individual item weights, directly lowering base weight. Advanced designs also contribute.
  2. Trip Length & Seasonality: Longer trips require more food and potentially more clothing layers, increasing overall pack weight. However, the *base weight* (excluding these) remains constant unless you choose lighter gear for longer trips. Seasonal variations (e.g., winter camping) necessitate heavier insulation and gear, increasing base weight.
  3. Shared Gear Strategy: Backpacking with a partner or group allows for sharing heavy items like tents, stoves, and first-aid kits. This dramatically reduces the *individual* base weight carried by each person.
  4. Personal Comfort vs. Weight Trade-off: A plush sleeping pad might be more comfortable but weighs more than a minimalist one. Deciding where to draw the line between comfort and weight is personal and impacts base weight.
  5. Durability Requirements: Ultralight gear can sometimes be less durable. If you anticipate harsh conditions or rough use, you might opt for slightly heavier but more robust gear, increasing your base weight.
  6. "Luxury" Items: Items like camp chairs, large toiletries kits, or extensive electronics add significant weight. Evaluating the true need for these "luxury" items is key to trimming unnecessary grams.
  7. Water Sources and Treatment: If water is scarce, you'll need to carry more, increasing pack weight (but not base weight). If water is abundant and easily purified, you can carry less.
  8. Food Choices: Dehydrated, freeze-dried meals are much lighter per calorie than fresh ingredients, significantly impacting the food weight component of your total pack weight.

Frequently Asked Questions (FAQ)

What is considered a "good" base weight?

For a typical 3-season backpacking trip, a base weight under 7 kg (approx. 15 lbs) is often considered good. Ultralight backpackers aim for under 5 kg (approx. 11 lbs). However, this depends heavily on the type of trip, season, and personal needs.

Does the weight of the clothes I'm wearing count towards my base weight?

No. Base weight includes all gear you carry *in your pack*, excluding food, water, and fuel. The weight of the clothing, boots, and accessories you are actively wearing during the hike is typically excluded from the base weight calculation itself, though it contributes to your overall *worn weight* which is a separate consideration for total load.

Should I weigh my gear wet or dry?

Always weigh your gear dry. However, be mindful of gear that absorbs water (like down jackets or sleeping bags) and consider how much extra weight they might gain if exposed to rain or heavy dew.

How accurate do the weights need to be?

As accurate as possible. Using a digital scale that measures in grams or tenths of kilograms is recommended. Small inaccuracies can add up, especially for meticulous ultralight hikers.

What if I don't have a scale?

You can estimate weights based on manufacturer specifications or online resources. However, for precise calculation, investing in a small digital scale is highly recommended. It's a valuable tool for any serious backpacker.

How does base weight affect my hiking speed and endurance?

A lower base weight directly translates to less physical effort required to carry your pack. This allows for faster hiking speeds, greater endurance over long distances, reduced risk of injury, and a generally more pleasant experience.

Can I calculate base weight for winter camping?

Yes, absolutely. Winter camping gear (heavier sleeping bags, warmer clothing, snow gear) will naturally result in a higher base weight. The principle remains the same: sum all gear excluding food, water, and fuel.

What's the difference between base weight and total pack weight?

Base weight is the weight of your gear alone. Total pack weight is your base weight PLUS the weight of consumables like food, water, and fuel you carry for a specific trip. Your total pack weight will always be higher than your base weight.

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var errors = { shelterWeight: "shelterWeightError", sleepingBagWeight: "sleepingBagWeightError", sleepingPadWeight: "sleepingPadWeightError", backpackWeight: "backpackWeightError", stoveSystemWeight: "stoveSystemWeightError", waterFilterWeight: "waterFilterWeightError", cookwareWeight: "cookwareWeightError", clothingWeight: "clothingWeightError", toiletriesWeight: "toiletriesWeightError", miscGearWeight: "miscGearWeightError", wornWeight: "wornWeightError", foodWeight: "foodWeightError", waterWeight: "waterWeightError", tripDays: "tripDaysError" }; var valid = true; for (var key in inputs) { if (!validateInput(inputs[key], errors[key])) { valid = false; } } if (!valid) { document.getElementById('result-area').style.display = 'none'; return; } var shelterWeight = parseFloat(document.getElementById('shelterWeight').value); var sleepingBagWeight = parseFloat(document.getElementById('sleepingBagWeight').value); var sleepingPadWeight = parseFloat(document.getElementById('sleepingPadWeight').value); var backpackWeight = parseFloat(document.getElementById('backpackWeight').value); var stoveSystemWeight = parseFloat(document.getElementById('stoveSystemWeight').value); var waterFilterWeight = parseFloat(document.getElementById('waterFilterWeight').value); var cookwareWeight = parseFloat(document.getElementById('cookwareWeight').value); var clothingWeight = parseFloat(document.getElementById('clothingWeight').value); var toiletriesWeight = parseFloat(document.getElementById('toiletriesWeight').value); var miscGearWeight = parseFloat(document.getElementById('miscGearWeight').value); var wornWeight = parseFloat(document.getElementById('wornWeight').value); // This is not part of base weight but used for context/total var foodWeightPerDay = parseFloat(document.getElementById('foodWeight').value); var waterWeightPerLiter = parseFloat(document.getElementById('waterWeight').value); var tripDays = parseInt(document.getElementById('tripDays').value); // Base Weight Components var baseWeight = shelterWeight + sleepingBagWeight + sleepingPadWeight + backpackWeight + stoveSystemWeight + waterFilterWeight + cookwareWeight + clothingWeight + toiletriesWeight + miscGearWeight; // Consumables var totalFoodWeight = foodWeightPerDay * tripDays; var initialWaterCarry = waterWeightPerLiter * 2; // Assuming 2L initial carry for calculation simplicity // Total Weights var totalGearWeightExcludingConsumables = baseWeight; // Same as base weight var dailyPackWeight = (baseWeight + foodWeightPerDay) / tripDays; // Average daily weight var dayOneTotalWeight = baseWeight + foodWeightPerDay + initialWaterCarry; // Update Results Display document.getElementById('primary-result').textContent = baseWeight.toFixed(2) + " kg"; document.getElementById('baseWeightResult').textContent = baseWeight.toFixed(2); document.getElementById('totalGearWeightResult').textContent = totalGearWeightExcludingConsumables.toFixed(2); document.getElementById('dailyPackWeightResult').textContent = (baseWeight / tripDays).toFixed(2); // Base weight per day document.getElementById('dayOneTotalWeightResult').textContent = dayOneTotalWeight.toFixed(2); document.getElementById('result-area').style.display = 'block'; // Update Table document.getElementById('tableShelterWeight').textContent = shelterWeight.toFixed(2); document.getElementById('tableSleepingBagWeight').textContent = sleepingBagWeight.toFixed(2); document.getElementById('tableSleepingPadWeight').textContent = sleepingPadWeight.toFixed(2); document.getElementById('tableBackpackWeight').textContent = backpackWeight.toFixed(2); document.getElementById('tableStoveSystemWeight').textContent = stoveSystemWeight.toFixed(2); document.getElementById('tableWaterFilterWeight').textContent = waterFilterWeight.toFixed(2); document.getElementById('tableCookwareWeight').textContent = cookwareWeight.toFixed(2); document.getElementById('tableClothingWeight').textContent = clothingWeight.toFixed(2); document.getElementById('tableToiletriesWeight').textContent = toiletriesWeight.toFixed(2); document.getElementById('tableMiscGearWeight').textContent = miscGearWeight.toFixed(2); document.getElementById('tableBaseWeightSubtotal').textContent = baseWeight.toFixed(2); document.getElementById('tableFoodWeight').textContent = foodWeightPerDay.toFixed(2); document.getElementById('tableWaterWeight').textContent = initialWaterCarry.toFixed(2); document.getElementById('tableDayOneTotalWeight').textContent = dayOneTotalWeight.toFixed(2); // Update Chart updateChart(baseWeight, foodWeightPerDay, initialWaterCarry); } function resetCalculator() { document.getElementById('shelterWeight').value = "1.5"; document.getElementById('sleepingBagWeight').value = "0.8"; document.getElementById('sleepingPadWeight').value = "0.5"; document.getElementById('backpackWeight').value = "1.2"; document.getElementById('stoveSystemWeight').value = "0.3"; document.getElementById('waterFilterWeight').value = "0.1"; document.getElementById('cookwareWeight').value = "0.2"; document.getElementById('clothingWeight').value = "0.7"; document.getElementById('toiletriesWeight').value = "0.2"; document.getElementById('miscGearWeight').value = "0.4"; document.getElementById('wornWeight').value = "2.0"; document.getElementById('foodWeight').value = "1.0"; document.getElementById('waterWeight').value = "1.0"; document.getElementById('tripDays').value = "3"; // Clear errors var errorIds = ["shelterWeightError", "sleepingBagWeightError", "sleepingPadWeightError", "backpackWeightError", "stoveSystemWeightError", "waterFilterWeightError", "cookwareWeightError", "clothingWeightError", "toiletriesWeightError", "miscGearWeightError", "wornWeightError", "foodWeightError", "waterWeightError", "tripDaysError"]; for (var i = 0; i < errorIds.length; i++) { document.getElementById(errorIds[i]).textContent = ""; document.getElementById(errorIds[i]).classList.remove('visible'); } document.getElementById('result-area').style.display = 'none'; if (chartInstance) { chartInstance.destroy(); } // Re-initialize chart to default state or clear it initChartData(); } function copyResults() { var baseWeight = document.getElementById('baseWeightResult').textContent; var totalGearWeight = document.getElementById('totalGearWeightResult').textContent; var dailyPackWeight = document.getElementById('dailyPackWeightResult').textContent; var dayOneTotalWeight = document.getElementById('dayOneTotalWeightResult').textContent; var shelter = document.getElementById('tableShelterWeight').textContent; var sleepingBag = document.getElementById('tableSleepingBagWeight').textContent; var sleepingPad = document.getElementById('tableSleepingPadWeight').textContent; var backpack = document.getElementById('tableBackpackWeight').textContent; var stove = document.getElementById('tableStoveSystemWeight').textContent; var waterFilter = document.getElementById('tableWaterFilterWeight').textContent; var cookware = document.getElementById('tableCookwareWeight').textContent; var clothing = document.getElementById('tableClothingWeight').textContent; var toiletries = document.getElementById('tableToiletriesWeight').textContent; var miscGear = document.getElementById('tableMiscGearWeight').textContent; var food = document.getElementById('tableFoodWeight').textContent; var water = document.getElementById('tableWaterWeight').textContent; var assumptions = "Trip Days: " + document.getElementById('tripDays').value + "\n" + "Food Weight per Day: " + document.getElementById('foodWeight').value + " kg\n" + "Water Weight per Liter: " + document.getElementById('waterWeight').value + " kg"; var textToCopy = "— Backpacking Base Weight Results —\n\n" + "Primary Result (Base Weight): " + baseWeight + "\n" + "Total Gear Weight (excl. consumables): " + totalGearWeight + "\n" + "Estimated Pack Weight (Avg Daily): " + dailyPackWeight + "\n" + "Estimated Total Pack Weight (Day 1): " + dayOneTotalWeight + "\n\n" + "— Detailed Breakdown —\n" + "Tent/Shelter: " + shelter + "\n" + "Sleeping Bag/Quilt: " + sleepingBag + "\n" + "Sleeping Pad: " + sleepingPad + "\n" + "Backpack: " + backpack + "\n" + "Stove & Fuel: " + stove + "\n" + "Water Filter/Purifier: " + waterFilter + "\n" + "Cookware & Food Storage: " + cookware + "\n" + "Clothing (non-worn): " + clothing + "\n" + "Toiletries & First Aid: " + toiletries + "\n" + "Miscellaneous Gear: " + miscGear + "\n" + "Food (Day 1): " + food + "\n" + "Water (Initial Carry): " + water + "\n\n" + "— Key Assumptions —\n" + assumptions; var textArea = document.createElement("textarea"); textArea.value = textToCopy; textArea.style.position = "fixed"; textArea.style.left = "-9999px"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'successful' : 'unsuccessful'; console.log('Copying text command was ' + msg); if (successful) { document.getElementById('successMessage').style.display = 'block'; setTimeout(function() { document.getElementById('successMessage').style.display = 'none'; }, 3000); } } catch (err) { console.log('Oops, unable to copy'); } document.body.removeChild(textArea); } function initChartData() { var ctx = document.getElementById('weightBreakdownChart').getContext('2d'); if (chartInstance) { chartInstance.destroy(); } chartInstance = new Chart(ctx, { type: 'bar', // Use bar for better comparison of stacked segments data: { labels: ['Day 1 Pack Weight'], datasets: [{ label: 'Base Gear Weight', data: [0], // Placeholder backgroundColor: '#6c757d', // Grey for base gear borderWidth: 1 }, { label: 'Consumables (Food & Water)', data: [0], // Placeholder backgroundColor: 'var(–primary-color)', // Primary color for consumables borderWidth: 1 }] }, options: { indexAxis: 'y', // Horizontal bars for better label readability responsive: true, maintainAspectRatio: false, scales: { x: { stacked: true, ticks: { beginAtZero: true, callback: function(value) { return value + ' kg'; } } }, y: { stacked: true } }, plugins: { legend: { display: false // Legend is provided separately }, tooltip: { callbacks: { label: function(context) { var label = context.dataset.label || ''; if (label) { label += ': '; } if (context.parsed.x !== null) { label += context.parsed.x + ' kg'; } return label; } } } } } }); } function updateChart(baseWeight, foodWeightPerDay, initialWaterCarry) { var dayOneTotalWeight = baseWeight + foodWeightPerDay + initialWaterCarry; var ctx = document.getElementById('weightBreakdownChart').getContext('2d'); if (!chartInstance) { initChartData(); // Initialize if not already done } // Update dataset with actual values chartInstance.data.datasets[0].data = [baseWeight]; // Base Gear Weight chartInstance.data.datasets[1].data = [foodWeightPerDay + initialWaterCarry]; // Consumables // Update total for scaling and display if needed chartInstance.options.scales.x.max = dayOneTotalWeight * 1.1; // Add some buffer chartInstance.update(); } // Initialize chart on load window.onload = function() { initChartData(); // Add event listeners for real-time updates var inputIds = ["shelterWeight", "sleepingBagWeight", "sleepingPadWeight", "backpackWeight", "stoveSystemWeight", "waterFilterWeight", "cookwareWeight", "clothingWeight", "toiletriesWeight", "miscGearWeight", "wornWeight", "foodWeight", "waterWeight", "tripDays"]; for (var i = 0; i < inputIds.length; i++) { document.getElementById(inputIds[i]).addEventListener('input', function() { // Clear previous error messages when user starts typing var errorId = this.id + "Error"; var errorElement = document.getElementById(errorId); if (errorElement) { errorElement.textContent = ""; errorElement.classList.remove('visible'); } calculateBaseWeight(); // Recalculate on any input change }); } // Initial calculation on load with default values calculateBaseWeight(); };

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