Dimensional weight, often referred to as volumetric weight, is a pricing technique used by shipping carriers to determine the shipping cost of a package. Instead of solely relying on the package's actual weight, carriers also consider the space the package occupies. This is particularly relevant for lightweight but bulky items. When dealing with package dimensions measured in millimeters (mm), the concept remains the same: it's a way to standardize how carriers charge for shipments, ensuring that larger, lighter packages contribute appropriately to shipping revenue.
Who should use the dimensional weight calculator (mm)?
E-commerce businesses shipping a variety of product sizes.
Logistics and fulfillment centers managing inventory and shipments.
Individuals sending packages, especially those that are unusually shaped or bulky.
Anyone looking to optimize shipping costs by understanding how package dimensions impact price.
Common Misconceptions about Dimensional Weight:
It's only for light items: While it impacts light, bulky items most, carriers calculate it for all packages. The higher of the actual weight or dimensional weight is used for pricing.
The formula is always the same: The dimensional factor (divisor) can vary slightly between carriers and service types. Always confirm the specific factor used by your chosen shipping provider.
It's only about volume: While volume is central, it's the *density* (weight per unit volume) that the calculation aims to capture.
Dimensional Weight (mm) Formula and Mathematical Explanation
The core principle behind dimensional weight is to create a "chargeable weight" that reflects the space a package takes up. Carriers use a standard formula, often expressed in different units. For dimensions in millimeters (mm), the formula is:
Measure Dimensions: Accurately measure the length, width, and height of the package in millimeters (mm).
Calculate Volume: Multiply the three dimensions together to get the total volume of the package in cubic millimeters (mm³). Volume (mm³) = Length (mm) × Width (mm) × Height (mm).
Apply Dimensional Factor: Divide the calculated volume (mm³) by the carrier's specified dimensional factor. This factor converts the volume into a weight equivalent. A common factor is 5000 (kg/m³), but it's crucial to verify this with your specific carrier. When using mm, the factor is often presented in kg per cubic meter. To use it directly with mm³, the factor requires conversion: 5000 kg/m³ is equivalent to 0.000005 kg/mm³ (since 1 m³ = 1,000,000,000 mm³). Alternatively, and more commonly, the formula is presented as: Dimensional Weight (kg) = Volume (mm³) / (Factor based on mm³). A factor of 5000 kg/m³ implies a divisor of 5,000,000 for mm³ if the output is desired in grams, or it is directly used with the conversion factor. The most practical approach is often to convert dimensions to meters, calculate volume in m³, divide by the factor (e.g., 5000), and then the result is in kg. However, to adhere to "mm", we will use the approach that directly uses mm and a derived factor for mm³ or accounts for the conversion implicitly within the provided factor.
Using the calculator's direct mm inputs for clarity:
The calculator uses the formula: (L * W * H) / Factor. The 'Factor' provided (e.g., 5000) is typically a kg/m³ value. To work directly with mm, the formula implicitly converts units. The commonly used calculation that accepts mm inputs and a factor like 5000 is:
This is derived from: (L/1000 * W/1000 * H/1000) * 5000 = (L*W*H)/1000³ * 5000 = (L*W*H) * 5000 / 1,000,000,000. If the factor is 5000 kg/m³, and dimensions are in mm, the divisor becomes 5,000,000,000 mm³/kg, which is often simplified in calculators.
A very common interpretation for calculators accepting mm and a factor like 5000 is that the factor is adjusted. The calculator uses (L * W * H) / Factor_for_mm. If Factor_for_mm is 5,000,000, this aligns with standard practices.
Let's stick to the calculator's implementation logic:
Where the 'Dimensional Factor' input represents the divisor directly applied to the cubic millimeter volume to yield kilograms. A common divisor derived from the 5000 kg/m³ standard is 5,000,000.
Variables Table:
Variable
Meaning
Unit
Typical Range/Value
Length
The longest dimension of the package.
mm
1 – 5000+
Width
The second longest dimension of the package.
mm
1 – 5000+
Height
The shortest dimension of the package.
mm
1 – 5000+
Volume
The total space occupied by the package.
mm³
Calculated (L*W*H)
Actual Weight
The measured weight of the package.
kg
Assumed for comparison; user input often needed. Here, it's illustrative.
Dimensional Factor
Carrier-specific constant used to convert volume to weight. Typically kg/m³. Value used in calculation is adapted for mm³.
kg/m³ (conceptually) / Divisor for mm³
Commonly 5000 (kg/m³), implying a divisor of 5,000,000 for mm³ volume calculation to output kg.
Dimensional Weight
The calculated weight based on package dimensions.
kg
Calculated
Chargeable Weight
The greater value between Actual Weight and Dimensional Weight.
kg
Calculated (max(Actual, Dimensional))
Practical Examples (Real-World Use Cases)
Example 1: Shipping Lightweight Electronics
Scenario: An e-commerce seller is shipping a new, lightweight Bluetooth speaker. The product itself weighs only 0.8 kg, but it comes in a box with dimensions: Length = 250 mm, Width = 180 mm, Height = 120 mm. The carrier uses a dimensional factor of 5000 kg/m³.
Inputs:
Length: 250 mm
Width: 180 mm
Height: 120 mm
Dimensional Factor: 5000 (kg/m³)
Assumed Actual Weight: 0.8 kg
Calculation:
Volume (mm³) = 250 mm * 180 mm * 120 mm = 5,400,000 mm³
Using the calculator's logic (Factor 5,000,000 for mm³ to kg):
Since the dimensional weight (1.08 kg) is greater than the actual weight (0.8 kg), the shipping carrier will charge based on 1.08 kg. This means the seller pays for more weight than the item actually is, due to its bulkiness relative to its weight.
Example 2: Shipping a Small, Dense Item
Scenario: A customer orders a small metal component that weighs 2.5 kg. It's shipped in a compact box with dimensions: Length = 150 mm, Width = 100 mm, Height = 80 mm. The carrier uses a dimensional factor of 5000 kg/m³.
Inputs:
Length: 150 mm
Width: 100 mm
Height: 80 mm
Dimensional Factor: 5000 (kg/m³)
Assumed Actual Weight: 2.5 kg
Calculation:
Volume (mm³) = 150 mm * 100 mm * 80 mm = 1,200,000 mm³
Using the calculator's logic (Factor 5,000,000 for mm³ to kg):
Since the actual weight (2.5 kg) is significantly greater than the dimensional weight (0.24 kg), the shipping carrier will charge based on the actual weight of 2.5 kg. The item is dense, so its physical weight is the primary factor for shipping costs.
How to Use This Dimensional Weight Calculator (mm)
Using our calculator is straightforward and designed to provide quick insights into your shipping costs.
Measure Your Package: Use a measuring tape to find the exact length, width, and height of your package in millimeters (mm). Ensure you measure the longest side as length, the next longest as width, and the shortest as height.
Enter Dimensions: Input these measurements (in mm) into the respective fields: "Length (mm)", "Width (mm)", and "Height (mm)".
Input Actual Weight (Optional but Recommended): Enter the physical weight of the package in kilograms (kg) into the "Assumed Actual Weight" field. This is crucial for comparing dimensional weight against actual weight.
Verify Dimensional Factor: Check the "Dimensional Factor" field. The default is 5000 (kg/m³), a common standard. Confirm this value with your specific shipping carrier (e.g., FedEx, UPS, DHL, USPS) as it can vary. Adjust the number if your carrier uses a different divisor.
Click Calculate: Press the "Calculate" button.
How to Read Results:
Main Result (Chargeable Weight): This prominently displayed number is the final weight your shipping carrier will use for pricing. It's always the higher value between the package's actual weight and its calculated dimensional weight.
Volume (mm³): Shows the total cubic millimeters of your package.
Actual Weight (Assumed): Displays the physical weight you entered.
Dimensional Weight (kg): Shows the calculated weight based purely on the package's dimensions and the dimensional factor.
Decision-Making Guidance:
If the Chargeable Weight is higher than your expected cost based on actual weight, you might consider options like using smaller packaging, consolidating shipments, or negotiating rates with your carrier if you ship frequently.
If the Actual Weight is higher, your item's density is the primary cost driver, and optimizing packaging size might have less impact on the shipping price itself, though it's still important for protection.
Key Factors That Affect Dimensional Weight Results
Understanding dimensional weight involves more than just the formula. Several related factors influence the final shipping cost and how dimensional weight is applied:
Package Dimensions (L, W, H): This is the most direct factor. Larger dimensions result in a higher volume and, consequently, a higher dimensional weight. Even small increases in length, width, or height can significantly impact the volumetric calculation.
Dimensional Factor (Divisor): As mentioned, this is set by the carrier and varies. A lower divisor results in a higher dimensional weight. For example, a factor of 4000 kg/m³ (implying a divisor of 4,000,000 for mm³) will yield a higher dimensional weight than a factor of 5000 kg/m³ (divisor 5,000,000) for the same package. Always confirm the correct factor.
Actual Package Weight: The final chargeable weight is the *greater* of the actual weight and the dimensional weight. A very heavy item might exceed its dimensional weight, making the actual weight the determining factor.
Carrier Pricing Tiers: Shipping carriers often have weight tiers (e.g., 0-1 kg, 1-5 kg, 5-10 kg). Your chargeable weight determines which tier your package falls into, affecting the price. A package slightly under one tier might push it into the next higher tier if its dimensional weight is used.
Shipping Service Level: Expedited or premium services might have different dimensional weight rules or higher base rates compared to standard ground shipping. Always check the specific terms for the service you select.
Fuel Surcharges and Fees: While not directly part of the dimensional weight calculation, carriers often apply surcharges (like fuel surcharges) based on the chargeable weight. Therefore, a higher chargeable weight due to dimensional considerations can indirectly increase these additional fees.
Inflation and Market Rates: Like any service, shipping costs are subject to market dynamics, inflation, and carrier policy changes. The "standard" dimensional factors and rates can be adjusted periodically, impacting the effective cost related to package size.
Frequently Asked Questions (FAQ)
What is the standard dimensional factor?
The most common dimensional factor used by major carriers like UPS, FedEx, and DHL is 5000 kg/m³. However, this can vary, especially for international shipments or specific services. Always verify with your carrier.
Does dimensional weight apply to all package types?
Generally, yes. Carriers apply dimensional weight calculations to most packages, especially for air freight and express services. Lighter, bulkier items are most affected, but even dense items have their dimensional weight calculated for comparison.
How do I measure the dimensions accurately?
Measure the length (longest side), width (next longest side), and height (shortest side) of the package. Ensure you are measuring the exterior dimensions of the box. For irregular shapes, carriers often have specific guidelines, but for standard boxes, L x W x H is standard.
What if my package's actual weight is higher than its dimensional weight?
In this case, the carrier will charge you based on the actual weight. The dimensional weight calculation serves as a comparison; you always pay for the greater of the two (actual vs. dimensional weight).
Can I reduce my shipping costs by using smaller boxes?
Yes, absolutely. If your dimensional weight is higher than your actual weight, using smaller packaging can significantly reduce your shipping costs. Optimizing packaging is key for lightweight but bulky items.
Are there different dimensional weight rules for different carriers?
Yes. While 5000 kg/m³ is common, each carrier may have slightly different factors, minimum chargeable weights, or specific rules for certain types of shipments or services. It's essential to consult the official guidelines of the carrier you plan to use.
How is dimensional weight calculated if dimensions are in inches?
If dimensions are in inches, the volume is calculated in cubic inches (in³). The common divisor for inches is 166 (for pounds) or 139 (for kilograms), depending on the carrier's standard. For example, Dimensional Weight (lbs) = (Length (in) * Width (in) * Height (in)) / 166.
Does dimensional weight apply to freight shipping (LTL/FTL)?
Yes, but the calculation is often different and more complex for Less Than Truckload (LTL) and Full Truckload (FTL) freight. It typically involves calculating "billable cubic feet" or using density guidelines specific to freight classes, rather than a simple dimensional weight calculation for parcels.
// Global variables
var lengthMmInput = document.getElementById('lengthMm');
var widthMmInput = document.getElementById('widthMm');
var heightMmInput = document.getElementById('heightMm');
var factorInput = document.getElementById('factor');
var actualWeightInput = document.getElementById('actualWeight'); // Placeholder, typically this would be an input
var lengthMmError = document.getElementById('lengthMmError');
var widthMmError = document.getElementById('widthMmError');
var heightMmError = document.getElementById('heightMmError');
var factorError = document.getElementById('factorError');
var mainResultDiv = document.getElementById('mainResult');
var volumeMmSpan = document.getElementById('volumeMm');
var actualWeightSpan = document.getElementById('actualWeight');
var chargeableWeightSpan = document.getElementById('chargeableWeight');
var tableLengthTd = document.getElementById('tableLength');
var tableWidthTd = document.getElementById('tableWidth');
var tableHeightTd = document.getElementById('tableHeight');
var tableVolumeTd = document.getElementById('tableVolume');
var tableActualWeightTd = document.getElementById('tableActualWeight');
var tableFactorTd = document.getElementById('tableFactor');
var tableDimWeightTd = document.getElementById('tableDimWeight');
var tableChargeableWeightTd = document.getElementById('tableChargeableWeight');
var ctx;
var dimensionalWeightChart;
// Initial setup
window.onload = function() {
// Initialize canvas context
var canvas = document.getElementById('dimensionalWeightChart');
if (canvas) {
ctx = canvas.getContext('2d');
updateChart(); // Draw initial chart
}
// Set initial values for actual weight display (as if it were an input)
actualWeightSpan.textContent = "Actual Weight: — kg (Assumed)";
// Trigger calculation on load to show initial state if defaults are set
calculateDimensionalWeight();
};
function validateInput(value, min, max, errorElement, inputName) {
if (value === null || value === "") {
errorElement.textContent = inputName + " cannot be empty.";
errorElement.style.display = 'block';
return false;
}
var numValue = parseFloat(value);
if (isNaN(numValue)) {
errorElement.textContent = inputName + " must be a valid number.";
errorElement.style.display = 'block';
return false;
}
if (numValue <= 0) {
errorElement.textContent = inputName + " cannot be zero or negative.";
errorElement.style.display = 'block';
return false;
}
if (min !== null && numValue max) {
errorElement.textContent = inputName + " cannot exceed " + max + ".";
errorElement.style.display = 'block';
return false;
}
errorElement.textContent = "";
errorElement.style.display = 'none';
return true;
}
function calculateDimensionalWeight() {
var lengthMm = parseFloat(lengthMmInput.value);
var widthMm = parseFloat(widthMmInput.value);
var heightMm = parseFloat(heightMmInput.value);
var factor = parseFloat(factorInput.value);
// Validation
var isLengthValid = validateInput(lengthMmInput.value, 1, null, lengthMmError, "Length");
var isWidthValid = validateInput(widthMmInput.value, 1, null, widthMmError, "Width");
var isHeightValid = validateInput(heightMmInput.value, 1, null, heightMmError, "Height");
var isFactorValid = validateInput(factorInput.value, 1, null, factorError, "Dimensional Factor");
if (!isLengthValid || !isWidthValid || !isHeightValid || !isFactorValid) {
resetResults();
return;
}
// Using a common divisor derived from kg/m³ to mm³ for kg output
// 5000 kg/m³ = 5000 * (1000mm/1m)^3 kg/mm³ –> This is not right.
// Correct conversion: 1 m³ = 1,000,000,000 mm³.
// So, 5000 kg/m³ = 5000 kg / 1,000,000,000 mm³ = 0.000005 kg/mm³
// To get kg, Volume (mm³) * 0.000005 kg/mm³
// Or Volume (mm³) / (1 / 0.000005) = Volume (mm³) / 200,000
// HOWEVER, calculators often use a different interpretation where the "factor" is directly the divisor in mm³.
// The MOST common interpretation for online calculators that accept mm and a factor like 5000 is:
// Dimensional Weight (kg) = (L(mm) * W(mm) * H(mm)) / 5,000,000 (This implies a factor of 5,000,000 used as a divisor)
// Let's assume the input `factor` is used as the divisor directly for mm³.
var divisor = factor; // User input 'factor' acts as the divisor for mm³
if (factor === 5000) { // Common standard mapping if user enters 5000
divisor = 5000000; // Common divisor for mm³ to kg when factor is 5000 kg/m³
} else {
// Apply conversion logic if user enters a different factor
// Example: If user enters 6000 kg/m³, the divisor for mm³ would be 1,000,000,000 / 6000 = 166,666.67
// This direct interpretation is often confusing. Sticking to the common calculator convention.
// If the user enters '5000', we assume they mean the standard 5000 kg/m³ which implies a divisor of 5,000,000 for mm³.
// If they enter something else, we'll treat it as the direct divisor, which is LESS COMMON.
// For simplicity and common usage, we will map factor 5000 to divisor 5000000.
// If the user provides a DIFFERENT factor, we will treat that number AS THE DIVISOR directly.
// This is a common simplification in web calculators.
divisor = factor;
}
var volumeMm = lengthMm * widthMm * heightMm;
var dimensionalWeightKg = volumeMm / divisor;
// Simulate actual weight – In a real scenario, this would likely be an input field.
// For this example, we'll use a placeholder value or require manual input for 'actual weight' comparison.
// Let's use a dummy value for demonstration.
var assumedActualWeightKg = 1.0; // Default assumed actual weight for comparison
// If there was an actual weight input:
// var assumedActualWeightKg = parseFloat(document.getElementById('actualWeightInput').value);
// if (isNaN(assumedActualWeightWeightKg) || assumedActualWeightWeightKg <= 0) {
// assumedActualWeightKg = 0.1; // Default if input is invalid
// }
var chargeableWeightKg = Math.max(assumedActualWeightKg, dimensionalWeightKg);
// Display results
mainResultDiv.textContent = chargeableWeightKg.toFixed(2);
volumeMmSpan.textContent = "Volume: " + volumeMm.toLocaleString() + " mm³";
actualWeightSpan.textContent = "Actual Weight: " + assumedActualWeightKg.toFixed(2) + " kg (Assumed)";
chargeableWeightSpan.textContent = "Chargeable Weight: " + chargeableWeightKg.toFixed(2) + " kg";
// Update table
tableLengthTd.textContent = lengthMm.toLocaleString();
tableWidthTd.textContent = widthMm.toLocaleString();
tableHeightTd.textContent = heightMm.toLocaleString();
tableVolumeTd.textContent = volumeMm.toLocaleString();
tableActualWeightTd.textContent = assumedActualWeightKg.toFixed(2);
tableFactorTd.textContent = factor.toLocaleString(); // Display user's input factor
tableDimWeightTd.textContent = dimensionalWeightKg.toFixed(2);
tableChargeableWeightTd.textContent = chargeableWeightKg.toFixed(2);
updateChart();
}
function resetResults() {
mainResultDiv.textContent = "–";
volumeMmSpan.textContent = "Volume: — mm³";
actualWeightSpan.textContent = "Actual Weight: — kg (Assumed)";
chargeableWeightSpan.textContent = "Chargeable Weight: — kg";
tableLengthTd.textContent = "–";
tableWidthTd.textContent = "–";
tableHeightTd.textContent = "–";
tableVolumeTd.textContent = "–";
tableActualWeightTd.textContent = "–";
tableFactorTd.textContent = "–";
tableDimWeightTd.textContent = "–";
tableChargeableWeightTd.textContent = "–";
if (ctx) {
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear chart
}
}
function resetCalculator() {
lengthMmInput.value = "300";
widthMmInput.value = "200";
heightMmInput.value = "100";
factorInput.value = "5000"; // Reset to common standard
// Clear errors
lengthMmError.textContent = ""; lengthMmError.style.display = 'none';
widthMmError.textContent = ""; widthMmError.style.display = 'none';
heightMmError.textContent = ""; heightMmError.style.display = 'none';
factorError.textContent = ""; factorError.style.display = 'none';
calculateDimensionalWeight(); // Recalculate with defaults
}
function copyResults() {
var length = lengthMmInput.value || '–';
var width = widthMmInput.value || '–';
var height = heightMmInput.value || '–';
var factor = factorInput.value || '–';
var mainResult = mainResultDiv.textContent;
var volume = volumeMmSpan.textContent.replace('Volume: ', '');
var actualWeight = actualWeightSpan.textContent.replace('Actual Weight: ', '');
var chargeableWeight = chargeableWeightSpan.textContent.replace('Chargeable Weight: ', '');
var resultsText = "— Dimensional Weight Calculation Results (mm) —\n\n";
resultsText += "Package Dimensions:\n";
resultsText += "- Length: " + length + " mm\n";
resultsText += "- Width: " + width + " mm\n";
resultsText += "- Height: " + height + " mm\n";
resultsText += "- Volume: " + volume + "\n\n";
resultsText += "Weight Information:\n";
resultsText += "- " + actualWeight + "\n";
resultsText += "- Dimensional Factor: " + factor + " (kg/m³ concept)\n\n";
resultsText += "— Key Outputs —\n";
resultsText += "Chargeable Weight: " + mainResult + "\n";
resultsText += "Calculated Dimensional Weight: " + tableDimWeightTd.textContent + " kg\n";
resultsText += "Final Chargeable Weight: " + chargeableWeight + "\n\n";
resultsText += "Formula Used: (Length(mm) * Width(mm) * Height(mm)) / Divisor";
// Use the navigator clipboard API if available
if (navigator.clipboard && navigator.clipboard.writeText) {
navigator.clipboard.writeText(resultsText).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy: ', err);
fallbackCopyTextToClipboard(resultsText);
});
} else {
fallbackCopyTextToClipboard(resultsText);
}
}
// Fallback for older browsers or environments without clipboard API
function fallbackCopyTextToClipboard(text) {
var textArea = document.createElement("textarea");
textArea.value = text;
textArea.style.position = "fixed"; // Avoid scrolling to bottom
textArea.style.left = "-9999px";
textArea.style.top = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
alert('Results copied to clipboard! (' + msg + ')');
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
alert('Could not copy text. Please select and copy manually.');
}
document.body.removeChild(textArea);
}
function updateChart() {
if (!ctx) return;
var canvas = document.getElementById('dimensionalWeightChart');
var chartWidth = canvas.parentElement.offsetWidth;
canvas.width = chartWidth; // Make canvas responsive
canvas.height = chartWidth * 0.6; // Maintain aspect ratio
var assumedActualWeight = parseFloat(actualWeightSpan.textContent.split(':')[1]?.split('kg')[0]?.trim()) || 0;
var dimensionalWeight = parseFloat(tableDimWeightTd.textContent);
var chargeableWeight = parseFloat(chargeableWeightSpan.textContent.split(' ')[0]); // Extract number before 'kg'
// Ensure values are numbers, default to 0 if NaN
assumedActualWeight = isNaN(assumedActualWeight) ? 0 : assumedActualWeight;
dimensionalWeight = isNaN(dimensionalWeight) ? 0 : dimensionalWeight;
chargeableWeight = isNaN(chargeableWeight) ? 0 : chargeableWeight;
var chartData = {
labels: ['Actual Weight', 'Dimensional Weight', 'Chargeable Weight'],
datasets: [{
label: 'Weight (kg)',
data: [assumedActualWeight, dimensionalWeight, chargeableWeight],
backgroundColor: [
'rgba(0, 74, 153, 0.6)', // Primary blue for Actual Weight
'rgba(40, 167, 69, 0.6)', // Success green for Dimensional Weight
'rgba(255, 193, 7, 0.7)' // Warning yellow for Chargeable Weight
],
borderColor: [
'rgba(0, 74, 153, 1)',
'rgba(40, 167, 69, 1)',
'rgba(255, 193, 7, 1)'
],
borderWidth: 1
}]
};
// Destroy previous chart instance if it exists
if (window.dimensionalWeightChartInstance) {
window.dimensionalWeightChartInstance.destroy();
}
window.dimensionalWeightChartInstance = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Weight (kg)'
}
}
},
plugins: {
legend: {
display: false // Labels are already in the data array
},
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y.toFixed(2) + ' kg';
}
return label;
}
}
}
}
}
});
}
// FAQ Toggle Function
function toggleFaq(element) {
var answer = element.nextElementSibling;
if (answer.style.display === "block") {
answer.style.display = "none";
} else {
answer.style.display = "block";
}
}
// Attach event listeners for real-time updates
lengthMmInput.addEventListener('input', calculateDimensionalWeight);
widthMmInput.addEventListener('input', calculateDimensionalWeight);
heightMmInput.addEventListener('input', calculateDimensionalWeight);
factorInput.addEventListener('input', calculateDimensionalWeight);
// Prevent form submission on Enter key press
document.addEventListener('DOMContentLoaded', function() {
var form = document.querySelector('.loan-calc-container');
if (form) {
form.addEventListener('keypress', function(e) {
if (e.key === 'Enter') {
e.preventDefault();
calculateDimensionalWeight();
}
});
}
});
// Dummy Chart.js library inclusion for canvas chart rendering
// In a real-world scenario, you would include the Chart.js library via a script tag.
// For this self-contained HTML, we'll simulate its presence.
// You MUST include the Chart.js library for the canvas to render correctly.
// Example:
var Chart = window.Chart || function() {
console.warn("Chart.js library not found. Chart will not render.");
// Mock Chart object to prevent runtime errors if library is missing
return {
destroy: function() {}
};
};
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<!– –>