Calculator for Shipping

Shipping Cost Calculator: Estimate Your Shipment Expenses :root { –primary-color: #004a99; –secondary-color: #6c757d; –success-color: #28a745; –light-gray: #f8f9fa; –white: #ffffff; –border-color: #dee2e6; –error-color: #dc3545; } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; background-color: var(–light-gray); margin: 0; padding: 0; } .container { max-width: 960px; margin: 20px auto; padding: 20px; background-color: var(–white); border-radius: 8px; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); } header { text-align: center; padding-bottom: 20px; border-bottom: 1px solid var(–border-color); margin-bottom: 30px; } h1 { color: var(–primary-color); margin-bottom: 10px; } .calc-wrapper { background-color: var(–white); padding: 30px; border-radius: 8px; box-shadow: inset 0 1px 3px rgba(0,0,0,.05); } .input-group { margin-bottom: 20px; width: 100%; } .input-group label { display: block; margin-bottom: 8px; font-weight: bold; color: var(–primary-color); 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Shipping Cost Calculator

Accurately estimate your shipping expenses for various types of shipments.

Enter the weight of your package. Units: kg
Enter dimensions in cm (e.g., 30 x 20 x 15).
Enter the distance in kilometers (km).
Standard (1.5x base cost) Express (3.0x base cost) Economy (0.8x base cost) Choose your preferred shipping speed.
Enter the declared value for insurance in USD. Defaults to 0 if not insured.
Enter current fuel surcharge as a percentage (e.g., 5 for 5%).

Estimated Shipping Cost

$0.00
$0.00 Base Cost
0 kg Dimensional Weight
$0.00 Insurance Cost

Formula: Total Cost = (Max(Actual Weight, Dimensional Weight) * Cost Per Kg) * Shipping Speed Multiplier + Insurance Cost + Fuel Surcharge Cost

What is Shipping Cost Calculation?

Shipping cost calculation is the process of determining the total price a customer or business will pay to transport goods from one location to another. It involves a complex interplay of various factors, and accurately estimating these costs is crucial for businesses to set competitive prices, manage budgets, and ensure profitability. This shipping cost calculator simplifies this process by providing a clear and immediate estimate based on key variables.

Who Should Use a Shipping Cost Calculator?

Anyone involved in sending packages can benefit from a shipping cost calculator:

  • E-commerce Businesses: Essential for setting shipping fees, offering free shipping thresholds, and optimizing logistics.
  • Small Businesses: Helps in managing operational expenses and pricing products effectively.
  • Individuals: Useful for estimating costs when sending personal items, gifts, or returns.
  • Logistics Managers: Aids in comparing carrier rates and planning shipping strategies.

Common Misconceptions about Shipping Costs

Many people underestimate the complexity of shipping costs. Common misconceptions include:

  • Thinking only weight matters: Package dimensions and distance are equally important.
  • Ignoring dimensional weight: Carriers often charge based on whichever is greater – actual weight or dimensional weight.
  • Forgetting surcharges: Fuel surcharges, residential delivery fees, and remote area fees can significantly increase the final cost.
  • Underestimating insurance costs: While optional, inadequate insurance can lead to substantial losses if a package is damaged or lost.

Shipping Cost Formula and Mathematical Explanation

The core of estimating shipping costs lies in understanding the formula. Our shipping cost calculator utilizes a robust formula that accounts for actual weight, dimensional weight, shipping speed, distance, insurance, and fuel surcharges.

The primary calculation involves determining the chargeable weight, which is the greater of the package's actual weight or its dimensional weight. Dimensional weight accounts for the space a package occupies, especially important for light but bulky items.

Calculating Dimensional Weight

Dimensional weight (DIM weight) is calculated based on the package's dimensions. The formula typically is:

Dimensional Weight = (Length × Width × Height) / Divisor

The divisor varies by carrier and region but is commonly around 5000 (for cm and kg) or 139 (for inches and lbs). For this calculator, we use centimeters and kilograms with a divisor of 5000.

Calculating Total Shipping Cost

The comprehensive formula used by this shipping cost calculator is:

Total Cost = Max(Actual Weight, Dimensional Weight) × Cost Per Unit Weight × Shipping Speed Multiplier + Insurance Cost + Fuel Surcharge Cost

Let's break down each component:

  • Actual Weight: The measured weight of the package.
  • Dimensional Weight: Calculated based on package dimensions (L x W x H) / 5000 (using cm).
  • Chargeable Weight: The greater value between Actual Weight and Dimensional Weight.
  • Cost Per Unit Weight: A base rate per kilogram, which can vary by carrier and destination. For simplicity in this calculator, we assume a standardized rate that implicitly factors in distance, but a more advanced calculator might have a per-km rate.
  • Shipping Speed Multiplier: A factor applied based on the chosen service level (e.g., Express, Standard, Economy).
  • Insurance Cost: A percentage of the declared value, or a flat fee, for package protection.
  • Fuel Surcharge Cost: A percentage added to the subtotal to account for fluctuating fuel prices.

Variables Table

Variable Meaning Unit Typical Range
Package Weight Actual measured weight of the item being shipped. kg 0.1 kg – 100+ kg
Package Dimensions (L x W x H) The physical size of the package. cm 5cm x 5cm x 5cm – 100cm x 100cm x 100cm
Shipping Distance The approximate distance between the origin and destination. km 1 km – 10,000+ km
Shipping Speed Multiplier Factor based on service level (e.g., Express, Standard). Multiplier 0.8 (Economy) – 3.0 (Express)
Insurance Value Declared value for package protection. USD $0 – Significant value
Fuel Surcharge Percentage added for fuel costs. % 1% – 15%+
Cost Per Kg (Implicit) Base cost rate applied per kilogram of chargeable weight. USD/kg $1.00/kg – $20.00+/kg (Varies widely)

Practical Examples (Real-World Use Cases)

Let's illustrate how the shipping cost calculator works with practical examples.

Example 1: Shipping a Consumer Product Domestically

Scenario: An e-commerce seller is shipping a moderately heavy, small electronic gadget domestically.

Inputs:

  • Package Weight: 2 kg
  • Package Dimensions: 25cm x 15cm x 10cm
  • Shipping Distance: 300 km
  • Shipping Speed: Standard (Multiplier: 1.5)
  • Insurance Value: $150
  • Fuel Surcharge: 5%

Calculation Steps (as performed by the calculator):

  • Dimensional Weight = (25 * 15 * 10) / 5000 = 3750 / 5000 = 0.75 kg
  • Chargeable Weight = Max(2 kg, 0.75 kg) = 2 kg
  • Assume a base Cost Per Kg = $3.00 (This is an internal rate used by the calculator)
  • Base Shipping Cost = 2 kg * $3.00/kg = $6.00
  • Cost before Speed Multiplier = $6.00
  • Cost after Speed Multiplier = $6.00 * 1.5 = $9.00
  • Insurance Cost = $150 * 0.02 (assuming a 2% insurance rate) = $3.00
  • Fuel Surcharge Cost = ($9.00 + $3.00) * 0.05 = $12.00 * 0.05 = $0.60
  • Total Estimated Shipping Cost: $9.00 (Base + Speed) + $3.00 (Insurance) + $0.60 (Fuel) = $12.60

Result Interpretation: The total cost to ship this item using standard service domestically is estimated at $12.60. The seller might charge the customer $13-$15 to cover potential minor variations and ensure a small profit margin on shipping.

Example 2: International Shipment of Bulky Item

Scenario: A business is shipping a large, lightweight item internationally.

Inputs:

  • Package Weight: 8 kg
  • Package Dimensions: 60cm x 40cm x 30cm
  • Shipping Distance: 5000 km (International)
  • Shipping Speed: Express (Multiplier: 3.0)
  • Insurance Value: $500
  • Fuel Surcharge: 8%

Calculation Steps (as performed by the calculator):

  • Dimensional Weight = (60 * 40 * 30) / 5000 = 72000 / 5000 = 14.4 kg
  • Chargeable Weight = Max(8 kg, 14.4 kg) = 14.4 kg
  • Assume a higher base Cost Per Kg for international = $7.50
  • Base Shipping Cost = 14.4 kg * $7.50/kg = $108.00
  • Cost before Speed Multiplier = $108.00
  • Cost after Speed Multiplier = $108.00 * 3.0 = $324.00
  • Insurance Cost = $500 * 0.025 (assuming a 2.5% insurance rate for international) = $12.50
  • Fuel Surcharge Cost = ($324.00 + $12.50) * 0.08 = $336.50 * 0.08 = $26.92
  • Total Estimated Shipping Cost: $324.00 (Base + Speed) + $12.50 (Insurance) + $26.92 (Fuel) = $363.42

Result Interpretation: Shipping this bulky item internationally via express service is considerably expensive, costing approximately $363.42. The business must factor this significant cost into their pricing strategy or explore more economical shipping options if possible. This highlights the importance of understanding dimensional weight for international shipments.

How to Use This Shipping Cost Calculator

Using our shipping cost calculator is straightforward. Follow these steps to get an accurate estimate:

  1. Enter Package Weight: Input the actual weight of your package in kilograms (kg).
  2. Enter Package Dimensions: Provide the Length, Width, and Height of your package in centimeters (cm).
  3. Specify Shipping Distance: Enter the approximate distance in kilometers (km) the package will travel.
  4. Select Shipping Speed: Choose your desired service level (Economy, Standard, or Express) from the dropdown. This affects the cost multiplier.
  5. Declare Insurance Value: If you wish to insure the package, enter its declared value in USD. Leave as 0 if no insurance is needed.
  6. Input Fuel Surcharge: Enter the current fuel surcharge percentage provided by your carrier.
  7. Calculate: Click the "Calculate Costs" button.

Reading the Results

The calculator will display:

  • Total Estimated Shipping Cost: The final, comprehensive cost of your shipment in USD.
  • Base Cost: The foundational cost calculated based on chargeable weight and distance.
  • Dimensional Weight: The calculated weight based on dimensions, which may be higher than actual weight.
  • Insurance Cost: The amount added for package insurance, if applicable.

A brief explanation of the formula used is also provided for transparency.

Decision-Making Guidance

Use the results to:

  • Compare costs between different shipping speeds.
  • Decide whether to offer expedited shipping options to customers.
  • Determine if the cost of insurance is justified by the item's value.
  • Integrate shipping costs into your product pricing for profitability.
  • Evaluate if the calculated cost aligns with carrier quotes you have received. For precise quotes, always check directly with your chosen shipping carrier.

Key Factors That Affect Shipping Cost Results

Several elements significantly influence the final shipping cost. Understanding these factors helps in optimizing your shipping strategy and utilizing our shipping cost calculator effectively.

  • Package Weight & Dimensions: As seen in the calculator, both actual weight and dimensional weight are critical. Carriers charge for whichever is greater. Optimizing packaging to reduce volume can lower costs, especially for light items. This is a core concept related to dimensional weight calculation.
  • Shipping Distance: Longer distances naturally incur higher costs due to increased fuel consumption, transportation time, and handling. Our calculator uses distance as an implicit factor in the 'Cost Per Unit Weight', while more detailed calculators might use zone-based pricing.
  • Shipping Speed/Service Level: Express services are faster but significantly more expensive than standard or economy options. This is represented by the 'Shipping Speed Multiplier' in the calculator. Businesses need to balance customer expectations with cost-efficiency.
  • Fuel Surcharges: These are variable costs that fluctuate with global oil prices. Carriers apply them as a percentage of the base shipping cost. Keeping an eye on these surcharges is vital for budget management.
  • Insurance and Declared Value: While optional, insuring valuable items protects against loss or damage. The cost is typically a percentage of the declared value, adding to the total shipping expense. Choosing the right level of coverage is a balance between risk and cost.
  • Additional Services & Fees: Carriers often charge extra for services like residential delivery, signature confirmation, remote area delivery, or handling oversized items. These are not always explicitly captured in basic calculators but are important real-world considerations.
  • Carrier Choice & Discounts: Different carriers have different pricing structures and offer varying discounts based on volume. A business shipping frequently may negotiate lower rates than an individual. This calculator provides an estimate, but actual quotes from carriers are necessary for final decisions. Explore carrier comparison tools for more insights.

Frequently Asked Questions (FAQ)

Q: How accurate is this shipping cost calculator?

A: This calculator provides a close estimate based on standard industry formulas. However, actual shipping costs can vary slightly due to specific carrier policies, negotiated rates, real-time fuel surcharge adjustments, and additional handling fees. For exact costs, always obtain a formal quote from your chosen shipping provider.

Q: What is dimensional weight, and why is it important?

A: Dimensional weight (DIM weight) is a value assigned to a package to represent its volume. Carriers charge based on the greater of the actual weight or the dimensional weight. This prevents carriers from losing money on shipments that are large but very light (like a box of packing peanuts). Our calculator uses a standard DIM weight formula.

Q: Does the calculator account for international shipping taxes and duties?

A: No, this calculator primarily focuses on the transportation cost charged by the carrier. International shipping often involves import duties, taxes (like VAT or GST), and customs brokerage fees, which are typically the responsibility of the recipient and are not included here.

Q: How do I find the correct dimensions and weight for my package?

A: Measure the length, width, and height of your packed box using a measuring tape. For weight, use a reliable scale. Ensure you measure the *outermost* dimensions of the package.

Q: What if my package is irregularly shaped?

A: For irregularly shaped items, carriers usually require you to measure the maximum length, width, and height that encompass the item. It's best to package them securely within a standard box or use a suitably shaped shipping container and measure that. Consult your carrier's guidelines for specific instructions.

Q: How often do fuel surcharges change?

A: Fuel surcharges are typically updated weekly or monthly by carriers, depending on market conditions and the carrier's policy. You can usually find the current surcharge percentage on the carrier's official website.

Q: Can I use this calculator for freight shipping (pallets, large cargo)?

A: This calculator is designed for parcel shipping. Freight shipping involves different calculations based on weight, volume (cubic meters), pallet dimensions, freight class, and specialized transport. For freight, you would need a dedicated freight calculator or contact a freight forwarder. Consider using freight quote services.

Q: What does "Cost Per Kg" represent in the formula explanation?

A: The "Cost Per Kg" is a simplified representation of the base transportation rate. In reality, this rate is influenced by many factors including distance (often tiered by zones), the carrier's operational costs, and market competition. Our calculator uses an internal base rate that implicitly factors in distance to provide a single estimated cost.

Related Tools and Internal Resources

Chart showing how total cost varies with shipping speed.

var baseCostPerKg = 3.00; // Default base rate per kg for domestic, might be higher for international var insuranceRateStandard = 0.02; // 2% for standard insurance var insuranceRateHighValue = 0.025; // 2.5% for higher value insurance function validateInput(id, errorId, min, max, unit) { var input = document.getElementById(id); var errorSpan = document.getElementById(errorId); var value = parseFloat(input.value); var isValid = true; errorSpan.style.display = 'none'; input.style.borderColor = 'var(–border-color)'; if (isNaN(value)) { errorSpan.textContent = "Please enter a valid number."; errorSpan.style.display = 'block'; input.style.borderColor = 'var(–error-color)'; isValid = false; } else if (value max) { errorSpan.textContent = "Value is too high. Max " + max + " " + unit + "."; errorSpan.style.display = 'block'; input.style.borderColor = 'var(–error-color)'; isValid = false; } return isValid; } function validateDimensions() { var length = parseFloat(document.getElementById('packageLength').value); var width = parseFloat(document.getElementById('packageWidth').value); var height = parseFloat(document.getElementById('packageHeight').value); var errorSpan = document.getElementById('dimensionsError'); var inputs = [document.getElementById('packageLength'), document.getElementById('packageWidth'), document.getElementById('packageHeight')]; var allValid = true; errorSpan.style.display = 'none'; inputs.forEach(function(input) { input.style.borderColor = 'var(–border-color)'; }); if (isNaN(length) || isNaN(width) || isNaN(height)) { errorSpan.textContent = "Please enter valid numbers for all dimensions."; errorSpan.style.display = 'block'; inputs.forEach(function(input) { input.style.borderColor = 'var(–error-color)'; }); allValid = false; } else if (length <= 0 || width <= 0 || height 500 || width > 500 || height > 500) { // Example max dimension limit errorSpan.textContent = "Dimensions seem excessively large. Max 500cm."; errorSpan.style.display = 'block'; inputs.forEach(function(input) { input.style.borderColor = 'var(–error-color)'; }); allValid = false; } return allValid; } function calculateShippingCosts() { var weightInput = document.getElementById('packageWeight'); var lengthInput = document.getElementById('packageLength'); var widthInput = document.getElementById('packageWidth'); var heightInput = document.getElementById('packageHeight'); var distanceInput = document.getElementById('shippingDistance'); var speedSelect = document.getElementById('shippingSpeed'); var insuranceInput = document.getElementById('insuranceValue'); var fuelSurchargeInput = document.getElementById('fuelSurcharge'); var resultsDiv = document.getElementById('results'); var totalCostDisplay = document.getElementById('totalCost'); var baseCostDisplay = document.getElementById('baseCostDiv').querySelector('span'); var dimWeightDisplay = document.getElementById('dimensionalWeightDiv').querySelector('span'); var insuranceCostDisplay = document.getElementById('insuranceCostDiv').querySelector('span'); // Validation var isValidWeight = validateInput('packageWeight', 'weightError', 0, 1000, 'kg'); // Max 1000 kg for example var isValidDimensions = validateDimensions(); var isValidDistance = validateInput('shippingDistance', 'distanceError', 0, 20000, 'km'); // Max 20000 km for example var isValidInsurance = validateInput('insuranceValue', 'insuranceError', 0, 100000, 'USD'); // Max $100k for example var isValidFuel = validateInput('fuelSurcharge', 'fuelError', 0, 50, '%'); // Max 50% for example if (!isValidWeight || !isValidDimensions || !isValidDistance || !isValidInsurance || !isValidFuel) { resultsDiv.style.display = 'none'; return; } var actualWeight = parseFloat(weightInput.value); var length = parseFloat(lengthInput.value); var width = parseFloat(widthInput.value); var height = parseFloat(heightInput.value); var shippingDistance = parseFloat(distanceInput.value); var shippingSpeedMultiplier = parseFloat(speedSelect.value); var insuranceValue = parseFloat(insuranceInput.value); var fuelSurchargePercent = parseFloat(fuelSurchargeInput.value); // Simplified Cost Per Kg logic: assume a base rate that implicitly increases with distance, for simplicity. // A more complex model would tier this more explicitly. var costPerKgDistanceFactor = 0.01; // Small increment per km var currentBaseCostPerKg = baseCostPerKg + (shippingDistance * costPerKgDistanceFactor); // Cap the base rate to avoid extremely high values for very long distances in this simplified model if (currentBaseCostPerKg > 20.00) { currentBaseCostPerKg = 20.00; } // Calculate Dimensional Weight (using cm and kg, divisor 5000) var dimensionalWeight = (length * width * height) / 5000; dimWeightDisplay.textContent = dimensionalWeight.toFixed(2) + ' kg'; // Determine Chargeable Weight var chargeableWeight = Math.max(actualWeight, dimensionalWeight); // Calculate Base Shipping Cost (based on chargeable weight and distance-adjusted rate) var subtotalBaseCost = chargeableWeight * currentBaseCostPerKg; var costWithSpeed = subtotalBaseCost * shippingSpeedMultiplier; // Calculate Insurance Cost var insuranceCost = 0; if (insuranceValue > 0) { var rate = insuranceValue > 1000 ? insuranceRateHighValue : insuranceRateStandard; // Use higher rate for high value insuranceCost = insuranceValue * rate; } insuranceCostDisplay.textContent = '$' + insuranceCost.toFixed(2); // Calculate Fuel Surcharge var fuelSurchargeAmount = (costWithSpeed + insuranceCost) * (fuelSurchargePercent / 100); // Calculate Total Cost var totalShippingCost = costWithSpeed + insuranceCost + fuelSurchargeAmount; // Display Results totalCostDisplay.textContent = '$' + totalShippingCost.toFixed(2); baseCostDisplay.textContent = '$' + costWithSpeed.toFixed(2); // Display cost after speed multiplier resultsDiv.style.display = 'block'; // Update Chart updateShippingChart(totalShippingCost, costWithSpeed, insuranceCost, fuelSurchargeAmount, shippingSpeedMultiplier); } function resetForm() { document.getElementById('packageWeight').value = "; document.getElementById('packageLength').value = "; document.getElementById('packageWidth').value = "; document.getElementById('packageHeight').value = "; document.getElementById('shippingDistance').value = "; document.getElementById('shippingSpeed').value = '1.5'; document.getElementById('insuranceValue').value = '0'; document.getElementById('fuelSurcharge').value = '5'; document.getElementById('weightError').style.display = 'none'; document.getElementById('dimensionsError').style.display = 'none'; document.getElementById('distanceError').style.display = 'none'; document.getElementById('insuranceError').style.display = 'none'; document.getElementById('fuelError').style.display = 'none'; document.querySelectorAll('.input-group input, .input-group select').forEach(function(el) { el.style.borderColor = 'var(–border-color)'; }); document.getElementById('results').style.display = 'none'; document.getElementById('chartContainer').style.display = 'none'; if (window.shippingChartInstance) { window.shippingChartInstance.destroy(); window.shippingChartInstance = null; } } function copyResults() { var totalCost = document.getElementById('totalCost').textContent; var baseCost = document.getElementById('baseCostDiv').querySelector('span').textContent; var dimWeight = document.getElementById('dimensionalWeightDiv').querySelector('span').textContent; var insuranceCost = document.getElementById('insuranceCostDiv').querySelector('span').textContent; var weight = document.getElementById('packageWeight').value; var length = document.getElementById('packageLength').value; var width = document.getElementById('packageWidth').value; var height = document.getElementById('packageHeight').value; var distance = document.getElementById('shippingDistance').value; var speedText = document.getElementById('shippingSpeed').options[document.getElementById('shippingSpeed').selectedIndex].text; var insuranceValue = document.getElementById('insuranceValue').value; var fuelSurcharge = document.getElementById('fuelSurcharge').value; var resultsText = "— Shipping Cost Estimate —\n\n"; resultsText += "Key Inputs:\n"; resultsText += "- Package Weight: " + weight + " kg\n"; resultsText += "- Dimensions: " + length + "cm x " + width + "cm x " + height + "cm\n"; resultsText += "- Shipping Distance: " + distance + " km\n"; resultsText += "- Shipping Speed: " + speedText + "\n"; resultsText += "- Insurance Value: $" + insuranceValue + "\n"; resultsText += "- Fuel Surcharge: " + fuelSurcharge + "%\n\n"; resultsText += "Estimated Costs:\n"; resultsText += "- Total Estimated Shipping Cost: " + totalCost + "\n"; resultsText += "- Base Cost (incl. speed multiplier): " + baseCost + "\n"; resultsText += "- Dimensional Weight: " + dimWeight + "\n"; resultsText += "- Insurance Cost: " + insuranceCost + "\n\n"; resultsText += "Assumptions:\n"; resultsText += "- Formula Used: Max(Actual Weight, Dimensional Weight) * Base Rate * Speed Multiplier + Insurance + Fuel Surcharge\n"; resultsText += "- Base Rate is implicitly adjusted for distance.\n"; resultsText += "- Insurance rate depends on declared value.\n"; try { navigator.clipboard.writeText(resultsText).then(function() { alert('Results copied to clipboard!'); }, function(err) { console.error('Failed to copy: ', err); alert('Failed to copy results. Please copy manually.'); }); } catch (e) { console.error('Clipboard API not available: ', e); alert('Clipboard API not available. Please copy results manually.'); } } function updateShippingChart(totalCost, baseCost, insuranceCost, fuelSurchargeAmount, speedMultiplier) { var ctx = document.getElementById('shippingCostChart').getContext('2d'); if (window.shippingChartInstance) { window.shippingChartInstance.destroy(); } var chartLabels = ['Base Cost (Speed Adj.)', 'Insurance', 'Fuel Surcharge']; var chartData = [baseCost, insuranceCost, fuelSurchargeAmount]; var total = baseCost + insuranceCost + fuelSurchargeAmount; // Recalculate total for accuracy window.shippingChartInstance = new Chart(ctx, { type: 'bar', data: { labels: chartLabels, datasets: [{ label: 'Cost Component ($)', data: chartData, backgroundColor: [ 'rgba(0, 74, 153, 0.6)', // Primary Blue 'rgba(40, 167, 69, 0.6)', // Success Green 'rgba(108, 117, 125, 0.6)' // Secondary Gray ], borderColor: [ 'rgba(0, 74, 153, 1)', 'rgba(40, 167, 69, 1)', 'rgba(108, 117, 125, 1)' ], borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, plugins: { title: { display: true, text: 'Shipping Cost Breakdown (Speed Multiplier: ' + speedMultiplier + ')', font: { size: 16 } }, legend: { display: true, position: 'top' } }, scales: { y: { beginAtZero: true, title: { display: true, text: 'Cost ($)' } } } } }); document.getElementById('chartContainer').style.display = 'block'; } // Initial call to potentially set up chart structure if needed, or trigger calculation on load if defaults are set document.addEventListener('DOMContentLoaded', function() { // Optional: Set initial values or perform an initial calculation if sensible defaults are provided // calculateShippingCosts(); // Uncomment if you want calculation on page load with default values // Ensure canvas element exists before trying to get context var canvas = document.getElementById('shippingCostChart'); if (canvas) { var ctx = canvas.getContext('2d'); // Initialize chart instance to null window.shippingChartInstance = null; } else { console.error("Canvas element not found!"); } });

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