Shipping Weight Calculation: Accurate Shipping Weight Formula
Calculate the billable weight for your shipments. Understanding both actual and dimensional weight is crucial for accurate shipping costs.
Shipping Weight Calculator
Enter the physical weight of the package in kilograms (kg).
Enter the longest dimension in centimeters (cm).
Enter the second longest dimension in centimeters (cm).
Enter the shortest dimension in centimeters (cm).
Carrier-specific divisor for dimensional weight calculation. (Common: 5000 for kg, 139 for lbs).
Kilograms (kg)
Pounds (lbs)
Select the unit for your actual weight.
Calculation Results
Billable Weight:—
Actual Weight: —
Dimensional Weight: —
Dimensions (LxWxH): —
How it works: The Billable Weight is the greater of the Actual Weight or the Dimensional Weight. Dimensional Weight is calculated by multiplying Length x Width x Height, dividing by the Weight Divisor.
Key Assumptions:
Weight Unit: —
Weight Divisor Used: —
Weight Comparison Chart
Comparison of Actual Weight vs. Dimensional Weight
What is Shipping Weight Calculation?
Shipping weight calculation is the process of determining the weight used by carriers to charge for shipments. This isn't always as simple as just weighing the package. Carriers use two main types of weight: Actual Weight and Dimensional Weight (often called "DIM Weight"). The shipping weight calculation dictates which of these two weights will be used for billing.
Actual Weight is the straightforward measurement of a package's physical weight using a scale.
Dimensional Weight is calculated based on the package's volume (length, width, and height). Carriers use DIM weight to account for the space a package occupies on a truck or airplane, as larger, lighter packages can be just as costly to transport as smaller, heavier ones.
The final Billable Weight is always the *greater* of the Actual Weight or the Dimensional Weight. This ensures that carriers are compensated appropriately for either the mass or the volume of the shipment.
Who should use shipping weight calculation:
E-commerce businesses shipping physical products.
Logistics and fulfillment centers.
Small businesses sending samples or inventory.
Individuals sending packages via courier services.
Anyone looking to optimize shipping costs.
Common misconceptions about shipping weight:
Myth: Only heavy items incur high shipping costs. Reality: Bulky but light items can cost more due to dimensional weight.
Myth: All carriers use the same formula and divisor. Reality: While the concept is similar, exact divisors can vary significantly between carriers and service types. Always verify the divisor for your chosen carrier.
Myth: Actual weight is always the billable weight. Reality: Dimensional weight often becomes the billable weight for larger, lighter packages.
Shipping Weight Calculation: Formula and Mathematical Explanation
Understanding the shipping weight calculation formula is key to managing shipping expenses. The process involves determining two primary weights and then selecting the higher one for billing.
Step 1: Calculate Dimensional Weight
This step converts the physical dimensions of a package into a weight equivalent.
This means you take the larger of the two values. If your package weighs 10 kg and its dimensions result in a dimensional weight of 15 kg, the billable weight is 15 kg. If the package weighs 20 kg and its dimensions result in a dimensional weight of 15 kg, the billable weight is 20 kg.
Variables Table
Variable
Meaning
Unit
Typical Range / Notes
Actual Weight
The physical weight of the package measured on a scale.
Kilograms (kg) or Pounds (lbs)
Typically > 0.1 kg.
Length (L)
The longest dimension of the package.
Centimeters (cm) or Inches (in)
Typically > 0.1 cm.
Width (W)
The second longest dimension of the package.
Centimeters (cm) or Inches (in)
Typically > 0.1 cm.
Height (H)
The shortest dimension of the package.
Centimeters (cm) or Inches (in)
Typically > 0.1 cm.
Weight Divisor
Carrier-defined constant used to convert volume to weight.
Unitless (based on units of L, W, H and desired weight unit)
Common values: 5000 (metric: cm/kg), 6000 (metric: cm/kg, some carriers), 139 (imperial: in/lbs), 166 (imperial: in/lbs). Always verify with your carrier.
Dimensional Weight
Calculated weight based on package volume.
Kilograms (kg) or Pounds (lbs)
Varies based on inputs and divisor.
Billable Weight
The greater of Actual Weight or Dimensional Weight.
Kilograms (kg) or Pounds (lbs)
The final weight used for shipping charges.
Practical Examples
Let's illustrate the shipping weight calculation with real-world scenarios.
Example 1: Standard Product Box
A small business is shipping a lightweight product in a box.
Actual Weight: 2.5 kg
Package Dimensions: 30 cm (Length) x 20 cm (Width) x 10 cm (Height)
Carrier Weight Divisor: 5000 (for metric units)
Calculation:
Dimensional Weight: (30 cm × 20 cm × 10 cm) / 5000 = 6000 cm³ / 5000 = 1.2 kg
Billable Weight: MAX(Actual Weight, Dimensional Weight) = MAX(2.5 kg, 1.2 kg) = 2.5 kg
Interpretation: In this case, the actual weight (2.5 kg) is greater than the dimensional weight (1.2 kg). Therefore, the carrier will bill based on 2.5 kg. The box is relatively dense.
Example 2: Large, Lightweight Item
An online retailer is shipping a large but very light item, like a large plush toy or bedding.
Actual Weight: 3 kg
Package Dimensions: 60 cm (Length) x 40 cm (Width) x 30 cm (Height)
Carrier Weight Divisor: 5000
Calculation:
Dimensional Weight: (60 cm × 40 cm × 30 cm) / 5000 = 72000 cm³ / 5000 = 14.4 kg
Billable Weight: MAX(Actual Weight, Dimensional Weight) = MAX(3 kg, 14.4 kg) = 14.4 kg
Interpretation: Here, the dimensional weight (14.4 kg) is significantly higher than the actual weight (3 kg). The carrier will charge based on 14.4 kg, reflecting the large amount of space the package occupies. This is where understanding shipping weight calculation is crucial for cost savings, perhaps by using smaller packaging or consolidating shipments if possible.
Example 3: Using Imperial Units
Shipping a product within the US using a carrier that uses imperial units.
Actual Weight: 15 lbs
Package Dimensions: 24 inches (Length) x 18 inches (Width) x 12 inches (Height)
Carrier Weight Divisor: 139 (for imperial units)
Calculation:
Dimensional Weight: (24 in × 18 in × 12 in) / 139 = 5184 in³ / 139 ≈ 37.3 lbs
Interpretation: The dimensional weight is much higher than the actual weight. The billable weight will be 37.3 lbs. This highlights the importance of selecting the correct weight divisor based on the carrier's specifications and the units of measurement used.
How to Use This Shipping Weight Calculator
Our free online calculator simplifies the shipping weight calculation process. Follow these easy steps:
Enter Actual Weight: Input the physical weight of your package in kilograms or pounds into the "Actual Weight" field.
Measure Dimensions: Accurately measure the Length (longest side), Width (second longest side), and Height (shortest side) of your package in centimeters or inches. Enter these values into their respective fields.
Select Weight Unit: Choose the unit (kg or lbs) that corresponds to your actual weight measurement. This helps ensure correct calculations.
Input Carrier Weight Divisor: Enter the specific weight divisor provided by your shipping carrier. Common metric divisors include 5000 or 6000, and imperial divisors often include 139 or 166. Crucially, always verify this divisor with your specific carrier and service level, as it can significantly impact the result.
Click Calculate: Press the "Calculate" button.
How to read results:
Billable Weight: This is the most important figure. It's the weight your carrier will use to determine your shipping cost.
Actual Weight: Your input value for the package's physical weight.
Dimensional Weight: The calculated weight based on package volume and the divisor.
Dimensions (LxWxH): A confirmation of the dimensions you entered.
Key Assumptions: Shows the units and divisor used for this specific calculation, which is vital for verification.
Decision-making guidance:
If Billable Weight is significantly higher than Actual Weight, investigate ways to reduce package volume (smaller boxes, void fill optimization) or consolidate shipments.
If Actual Weight is higher, ensure your package isn't overweight for the chosen service or consider offering heavier items.
Compare the results with different carrier divisors if you are comparing quotes from multiple carriers.
Use the "Copy Results" button to easily share or record the details of your calculation. The "Reset" button allows you to clear the fields and start fresh.
Key Factors That Affect Shipping Weight Results
Several factors can influence the final billable weight and, consequently, your shipping costs. Understanding these can help optimize your shipping strategy.
Package Dimensions (L x W x H): This is the most direct factor influencing Dimensional Weight. Even small changes in length, width, or height can increase the volume and therefore the DIM weight. Optimizing box size is critical.
Carrier Weight Divisor: This is a critical variable set by each shipping carrier. A lower divisor (e.g., 5000) will result in a higher Dimensional Weight compared to a higher divisor (e.g., 6000) for the same dimensions. Always confirm the divisor for the specific service and carrier you are using. For example, UPS dimensional weight and FedEx dimensional weight might use different divisors.
Actual Weight: While Dimensional Weight often catches the eye, the Actual Weight is equally important. If your package is dense (heavy for its size), the Actual Weight will likely be the billable weight. Ensure your products are packed efficiently to avoid unnecessary actual weight if possible, but never compromise structural integrity.
Units of Measurement: Using inconsistent units (e.g., mixing inches and centimeters, or kilograms and pounds) will lead to incorrect calculations. Ensure all measurements are in the same system (metric or imperial) and match the carrier's expectations for their divisor. Our calculator helps manage this by allowing you to select your weight unit.
Packaging Materials: The type and amount of packaging used contribute to both Actual Weight and Dimensional Weight. Excessive void fill, oversized boxes, or heavy-duty packaging can increase both metrics. Choose appropriate, lightweight, but protective materials.
Carrier Policies & Service Level: Different carriers (e.g., USPS shipping calculator, DHL) and even different service levels within the same carrier can have slightly different rules or weight divisors. Some international services might have unique calculations. Always refer to the carrier's official guidelines.
Rounding Rules: While less common now with digital calculators, some carriers historically rounded up dimensional weight to the nearest pound or kilogram. While our calculator provides a precise number, be aware that some carriers might apply their own rounding.
Frequently Asked Questions (FAQ)
Q1: What is the difference between actual weight and dimensional weight?
Actual weight is the physical weight of the package measured by a scale. Dimensional weight is a calculated weight based on the package's volume (Length x Width x Height) divided by a carrier-specific divisor.
Q2: Which weight does the shipping company charge for?
Shipping companies charge for the greater of the actual weight or the dimensional weight. This is known as the billable weight.
Q3: What are common weight divisors?
Common metric divisors (for cm/kg) are 5000 and 6000. Common imperial divisors (for inches/lbs) are 139 and 166. These can vary by carrier and service, so always check with your provider.
Q4: Does the order of dimensions (L, W, H) matter?
Yes, the dimensions should be entered from longest to shortest (Length, Width, Height) for consistency, though mathematically, the product L x W x H is commutative. It's best practice to assign them consistently.
Q5: What if my package is very light but large?
This is exactly the scenario where dimensional weight becomes critical. The carrier will likely bill you based on the higher dimensional weight, as the package occupies significant space. Optimizing packaging size is key here.
Q6: Should I round my measurements or the final weight?
It's best to use precise measurements. While some carriers may round the final billable weight, inputting accurate dimensions and weights into the calculator will give you the most accurate *calculated* result. Always verify carrier-specific rounding policies.
Q7: Can I use this calculator for international shipping?
Yes, provided you use the correct weight divisor specified by the international carrier for the region and service you are using. Units (cm/kg or in/lbs) must also be consistent with the divisor. Always check specific international carrier requirements.
Q8: How can I reduce my shipping costs related to weight?
Focus on reducing both actual and dimensional weight. Use smaller, appropriately sized boxes, lighter packaging materials, and consolidate multiple items into fewer, larger shipments where feasible. Negotiate rates with carriers if you ship in high volumes. Understanding your shipping cost per package is vital.
Q9: What happens if I enter dimensions in inches but the divisor expects centimeters?
The calculation will be incorrect. It's crucial to match your input units (inches or centimeters) with the expected units for the weight divisor. Most metric divisors (like 5000) expect cm, and most imperial divisors (like 139) expect inches. Ensure consistency.
Related Tools and Internal Resources
Shipping Cost CalculatorEstimate total shipping costs based on various factors including weight, dimensions, and destination.
Understanding Freight ShippingAn overview of Less Than Truckload (LTL) and Full Truckload (FTL) shipping for larger items.
// Function to update labels and placeholders based on selected unit
function updateWeightUnit() {
var unit = document.getElementById("weightUnit").value;
var actualWeightInput = document.getElementById("actualWeight");
var lengthInput = document.getElementById("length");
var widthInput = document.getElementById("width");
var heightInput = document.getElementById("height");
var actualWeightLabel = document.querySelector("label[for='actualWeight']");
var lengthLabel = document.querySelector("label[for='length']");
var widthLabel = document.querySelector("label[for='width']");
var heightLabel = document.querySelector("label[for='height']");
var actualWeightHelper = document.querySelector("#actualWeight + .helper-text");
var lengthHelper = document.querySelector("#length + .helper-text");
var widthHelper = document.querySelector("#width + .helper-text");
var heightHelper = document.querySelector("#height + .helper-text");
if (unit === "kg") {
actualWeightLabel.textContent = "Actual Weight (kg)";
lengthLabel.textContent = "Package Length (cm)";
widthLabel.textContent = "Package Width (cm)";
heightLabel.textContent = "Package Height (cm)";
actualWeightInput.placeholder = "e.g., 5";
lengthInput.placeholder = "e.g., 30";
widthInput.placeholder = "e.g., 20";
heightInput.placeholder = "e.g., 10";
actualWeightHelper.textContent = "Enter the physical weight of the package in kilograms (kg).";
lengthHelper.textContent = "Enter the longest dimension in centimeters (cm).";
widthHelper.textContent = "Enter the second longest dimension in centimeters (cm).";
heightHelper.textContent = "Enter the shortest dimension in centimeters (cm).";
// Attempt to convert existing values if they are numeric
if (actualWeightInput.value && !isNaN(parseFloat(actualWeightInput.value))) {
actualWeightInput.value = convertToKg(parseFloat(actualWeightInput.value));
}
if (lengthInput.value && !isNaN(parseFloat(lengthInput.value))) {
lengthInput.value = convertToCm(parseFloat(lengthInput.value));
}
if (widthInput.value && !isNaN(parseFloat(widthInput.value))) {
widthInput.value = convertToCm(parseFloat(widthInput.value));
}
if (heightInput.value && !isNaN(parseFloat(heightInput.value))) {
heightInput.value = convertToCm(parseFloat(heightInput.value));
}
document.getElementById("weightDivisor").value = "5000"; // Default metric divisor
document.getElementById("assumptionWeightUnit").textContent = "Kilograms (kg)";
} else if (unit === "lbs") {
actualWeightLabel.textContent = "Actual Weight (lbs)";
lengthLabel.textContent = "Package Length (in)";
widthLabel.textContent = "Package Width (in)";
heightLabel.textContent = "Package Height (in)";
actualWeightInput.placeholder = "e.g., 11";
lengthInput.placeholder = "e.g., 12";
widthInput.placeholder = "e.g., 8";
heightInput.placeholder = "e.g., 4";
actualWeightHelper.textContent = "Enter the physical weight of the package in pounds (lbs).";
lengthHelper.textContent = "Enter the longest dimension in inches (in).";
widthHelper.textContent = "Enter the second longest dimension in inches (in).";
heightHelper.textContent = "Enter the shortest dimension in inches (in).";
// Attempt to convert existing values if they are numeric
if (actualWeightInput.value && !isNaN(parseFloat(actualWeightInput.value))) {
actualWeightInput.value = convertToLbs(parseFloat(actualWeightInput.value));
}
if (lengthInput.value && !isNaN(parseFloat(lengthInput.value))) {
lengthInput.value = convertToInches(parseFloat(lengthInput.value));
}
if (widthInput.value && !isNaN(parseFloat(widthInput.value))) {
widthInput.value = convertToInches(parseFloat(widthInput.value));
}
if (heightInput.value && !isNaN(parseFloat(heightInput.value))) {
heightInput.value = convertToInches(parseFloat(heightInput.value));
}
document.getElementById("weightDivisor").value = "139"; // Default imperial divisor
document.getElementById("assumptionWeightUnit").textContent = "Pounds (lbs)";
}
calculateShippingWeight(); // Recalculate with new unit/divisor
}
// Conversion functions
function lbsToKg(lbs) { return lbs * 0.453592; }
function kgToLbs(kg) { return kg / 0.453592; }
function inchesToCm(inches) { return inches * 2.54; }
function cmToInches(cm) { return cm / 2.54; }
function convertToKg(value) {
// Assumes input was potentially lbs if unit just changed to kg
var currentUnitSelect = document.getElementById("weightUnit");
if (currentUnitSelect.value === "kg") { // If current unit is already kg, no conversion needed from the *value* itself
return value; // Return as is, assuming it was entered in kg
} else { // If current unit is lbs, convert the existing value (which was lbs) to kg
return kgToLbs(value); // This logic is tricky. It assumes the user is seeing lbs values and changing to kg.
// A better approach might be to store an internal "base" unit value.
// For now, let's simplify: If the user *selects* kg, we assume any pre-filled value was in lbs and convert it.
// If the user *selects* lbs, we assume any pre-filled value was in kg and convert it.
// This is complex. Let's stick to the user explicitly entering values for the *current* unit.
// Instead, we'll just update placeholders and assume user enters correctly for the *new* unit.
// We only convert if we have a value *before* the change that *wasn't* properly handled.
// This simple conversion below might be problematic if the value wasn't actually from the *other* unit.
// Let's simplify: assume user will re-enter for new unit. Update only labels/placeholders.
return value; // No conversion, just update display label.
}
}
function convertToLbs(value) {
var currentUnitSelect = document.getElementById("weightUnit");
if (currentUnitSelect.value === "lbs") {
return value;
} else {
return value; // No conversion, just update display label.
}
}
function convertToCm(value) {
var currentUnitSelect = document.getElementById("weightUnit");
if (currentUnitSelect.value === "kg") { // If current unit is kg, dimensions should be cm
return value;
} else { // If current unit is lbs, dimensions should be inches. Need to convert previous value.
return value; // No conversion, just update display label.
}
}
function convertToInches(value) {
var currentUnitSelect = document.getElementById("weightUnit");
if (currentUnitSelect.value === "lbs") { // If current unit is lbs, dimensions should be inches
return value;
} else { // If current unit is kg, dimensions should be cm. Need to convert previous value.
return value; // No conversion, just update display label.
}
}
// Charting variables
var weightChart;
var chartContext;
// Initialization function to set up the chart
function initializeChart() {
var ctx = document.getElementById('weightChart').getContext('2d');
chartContext = ctx; // Store context for updates
weightChart = new Chart(ctx, {
type: 'bar', // Use bar chart for comparison
data: {
labels: ['Weight Comparison'],
datasets: [{
label: 'Actual Weight',
data: [0], // Placeholder data
backgroundColor: 'rgba(0, 74, 153, 0.6)', // Primary color
borderColor: 'rgba(0, 74, 153, 1)',
borderWidth: 1
}, {
label: 'Dimensional Weight',
data: [0], // Placeholder data
backgroundColor: 'rgba(40, 167, 69, 0.6)', // Success color
borderColor: 'rgba(40, 167, 69, 1)',
borderWidth: 1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Weight'
}
}
},
plugins: {
legend: {
position: 'top',
},
title: {
display: true,
text: 'Actual vs. Dimensional Weight'
}
}
}
});
}
// Function to update the chart
function updateChart(actualWeight, dimensionalWeight) {
if (!weightChart) {
initializeChart(); // Initialize if not already done
}
weightChart.data.datasets[0].data = [actualWeight];
weightChart.data.datasets[1].data = [dimensionalWeight];
weightChart.update();
}
function validateInput(value, id, min, max, name, unit) {
var errorElement = document.getElementById(id + 'Error');
var floatValue = parseFloat(value);
errorElement.textContent = "; // Clear previous error
if (value === "") {
errorElement.textContent = name + " is required.";
return false;
}
if (isNaN(floatValue)) {
errorElement.textContent = name + " must be a valid number.";
return false;
}
if (floatValue max) {
// errorElement.textContent = name + " is too large. Please enter a value up to " + max + " " + unit + ".";
// return false;
// }
return true;
}
function calculateShippingWeight() {
// Get input values
var actualWeightStr = document.getElementById("actualWeight").value;
var lengthStr = document.getElementById("length").value;
var widthStr = document.getElementById("width").value;
var heightStr = document.getElementById("height").value;
var weightDivisorStr = document.getElementById("weightDivisor").value;
var weightUnit = document.getElementById("weightUnit").value;
// Clear previous errors and results
document.getElementById("actualWeightError").textContent = "";
document.getElementById("lengthError").textContent = "";
document.getElementById("widthError").textContent = "";
document.getElementById("heightError").textContent = "";
document.getElementById("weightDivisorError").textContent = "";
document.getElementById("billableWeight").textContent = "–";
document.getElementById("displayActualWeight").textContent = "–";
document.getElementById("dimensionalWeight").textContent = "–";
document.getElementById("dimensions").textContent = "–";
document.getElementById("assumptionWeightDivisor").textContent = "–";
// Input validation
var isValid = true;
var actualWeight, length, width, height, weightDivisor, dimensionalWeight;
// Validate Actual Weight
if (!validateInput(actualWeightStr, "actualWeight", 0.1, null, "Actual Weight", weightUnit)) isValid = false;
else actualWeight = parseFloat(actualWeightStr);
// Validate Dimensions
if (!validateInput(lengthStr, "length", 0.1, null, "Package Length", weightUnit === "kg" ? "cm" : "in")) isValid = false;
else length = parseFloat(lengthStr);
if (!validateInput(widthStr, "width", 0.1, null, "Package Width", weightUnit === "kg" ? "cm" : "in")) isValid = false;
else width = parseFloat(widthStr);
if (!validateInput(heightStr, "height", 0.1, null, "Package Height", weightUnit === "kg" ? "cm" : "in")) isValid = false;
else height = parseFloat(heightStr);
// Validate Weight Divisor
if (!validateInput(weightDivisorStr, "weightDivisor", 1, null, "Weight Divisor", "")) isValid = false;
else weightDivisor = parseFloat(weightDivisorStr);
if (!isValid) {
updateChart(0, 0); // Reset chart on invalid input
return;
}
// Perform calculations
var dimensionalWeightValue = (length * width * height) / weightDivisor;
var billableWeight = Math.max(actualWeight, dimensionalWeightValue);
// Determine display units
var displayUnit = weightUnit;
var displayDimensionalWeight = dimensionalWeightValue.toFixed(2);
var displayBillableWeight = billableWeight.toFixed(2);
var displayActualWeight = actualWeight.toFixed(2);
var displayDimensions = length.toFixed(0) + " x " + width.toFixed(0) + " x " + height.toFixed(0) + (weightUnit === "kg" ? " cm" : " in");
// Update results display
document.getElementById("billableWeight").textContent = displayBillableWeight + " " + displayUnit;
document.getElementById("displayActualWeight").textContent = displayActualWeight + " " + displayUnit;
document.getElementById("dimensionalWeight").textContent = displayDimensionalWeight + " " + displayUnit;
document.getElementById("dimensions").textContent = displayDimensions;
document.getElementById("assumptionWeightDivisor").textContent = weightDivisor + " (for " + displayUnit + ")";
document.getElementById("assumptionWeightUnit").textContent = weightUnit === "kg" ? "Kilograms (kg)" : "Pounds (lbs)";
// Update chart
updateChart(actualWeight, dimensionalWeightValue);
}
function copyResults() {
var billableWeight = document.getElementById("billableWeight").textContent;
var actualWeight = document.getElementById("displayActualWeight").textContent;
var dimensionalWeight = document.getElementById("dimensionalWeight").textContent;
var dimensions = document.getElementById("dimensions").textContent;
var assumptionDivisor = document.getElementById("assumptionWeightDivisor").textContent;
var assumptionUnit = document.getElementById("assumptionWeightUnit").textContent;
var resultsText = "— Shipping Weight Calculation Results —\n\n";
resultsText += "Billable Weight: " + billableWeight + "\n";
resultsText += "Actual Weight: " + actualWeight + "\n";
resultsText += "Dimensional Weight: " + dimensionalWeight + "\n";
resultsText += "Dimensions (LxWxH): " + dimensions + "\n\n";
resultsText += "Key Assumptions:\n";
resultsText += "- Weight Unit: " + assumptionUnit + "\n";
resultsText += "- Weight Divisor Used: " + assumptionDivisor + "\n";
// Copy to clipboard
navigator.clipboard.writeText(resultsText).then(function() {
// Optionally provide feedback to the user
var copyButton = event.target;
var originalText = copyButton.textContent;
copyButton.textContent = "Copied!";
setTimeout(function() {
copyButton.textContent = originalText;
}, 2000);
}).catch(function(err) {
console.error('Failed to copy results: ', err);
alert('Failed to copy results. Please copy manually.');
});
}
function resetCalculator() {
document.getElementById("actualWeight").value = "";
document.getElementById("length").value = "";
document.getElementById("width").value = "";
document.getElementById("height").value = "";
document.getElementById("weightDivisor").value = "5000"; // Default metric divisor
document.getElementById("weightUnit").value = "kg"; // Default unit
// Clear errors
document.getElementById("actualWeightError").textContent = "";
document.getElementById("lengthError").textContent = "";
document.getElementById("widthError").textContent = "";
document.getElementById("heightError").textContent = "";
document.getElementById("weightDivisorError").textContent = "";
// Reset results display
document.getElementById("billableWeight").textContent = "–";
document.getElementById("displayActualWeight").textContent = "–";
document.getElementById("dimensionalWeight").textContent = "–";
document.getElementById("dimensions").textContent = "–";
document.getElementById("assumptionWeightDivisor").textContent = "–";
document.getElementById("assumptionWeightUnit").textContent = "–";
// Reset chart data to zero and update
if (weightChart) {
weightChart.data.datasets[0].data = [0];
weightChart.data.datasets[1].data = [0];
weightChart.update();
}
// Update labels/helpers for the reset unit (kg)
updateWeightUnit(); // This will also call calculateShippingWeight() after unit update
}
// Initialize chart on page load
window.onload = function() {
initializeChart();
updateWeightUnit(); // Set initial labels and defaults based on kg
calculateShippingWeight(); // Calculate initial values based on defaults
};