Rug Weight Calculator

Rug Weight Calculator: Estimate Your Rug's Kilograms body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; background-color: #f8f9fa; color: #333; margin: 0; padding: 0; } .container { max-width: 1000px; margin: 20px auto; padding: 20px; background-color: #ffffff; border-radius: 8px; box-shadow: 0 2px 10px rgba(0, 74, 153, 0.1); } .calc-header { text-align: center; margin-bottom: 30px; color: #004a99; } .calc-header h1 { margin-bottom: 10px; } .calc-header p { font-size: 1.1em; color: #555; } .loan-calc-container { background-color: #eef5fa; padding: 25px; border-radius: 8px; margin-bottom: 30px; border: 1px solid #cce0f5; } .input-group { margin-bottom: 20px; display: flex; flex-direction: column; align-items: flex-start; } .input-group label { display: block; font-weight: bold; margin-bottom: 8px; color: #004a99; font-size: 0.95em; } .input-group input[type="number"], .input-group select { width: 100%; padding: 10px 12px; border: 1px solid #ced4da; border-radius: 4px; box-sizing: border-box; font-size: 1em; transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out; } .input-group input[type="number"]:focus, .input-group select:focus { border-color: #004a99; box-shadow: 0 0 0 0.2rem rgba(0, 74, 153, 0.25); outline: none; } .input-group .helper-text { font-size: 0.85em; color: #6c757d; margin-top: 5px; } .input-group .error-message { color: #dc3545; font-size: 0.8em; margin-top: 5px; display: none; /* Hidden by default */ } .input-group.error input[type="number"], .input-group.error select { border-color: #dc3545; } .input-group.error .error-message { display: block; /* Shown when error class is present */ } .button-group { display: flex; justify-content: space-between; margin-top: 25px; flex-wrap: wrap; gap: 10px; } .btn { padding: 10px 20px; border: none; border-radius: 5px; font-size: 1em; cursor: pointer; font-weight: bold; transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out, transform 0.1s ease-in-out; text-align: center; flex: 1; min-width: 150px; } .btn-primary { background-color: #004a99; color: #ffffff; } .btn-primary:hover { background-color: #003f80; transform: translateY(-1px); } .btn-secondary { background-color: #6c757d; color: #ffffff; min-width: 120px; } .btn-secondary:hover { background-color: #5a6268; transform: translateY(-1px); } .btn-copy { background-color: #ffc107; color: #212529; min-width: 120px; } .btn-copy:hover { background-color: #e0a800; transform: translateY(-1px); } .result-display { background-color: #d4edda; color: #155724; padding: 25px; border-radius: 8px; border: 1px solid #c3e6cb; margin-top: 30px; text-align: center; } .result-display h2 { color: #004a99; margin-top: 0; margin-bottom: 15px; } .primary-result { font-size: 2.5em; font-weight: bold; margin-bottom: 10px; color: #28a745; } .intermediate-results { display: flex; justify-content: space-around; margin-bottom: 15px; flex-wrap: wrap; gap: 15px; } .intermediate-results div { text-align: center; } .intermediate-results span { display: block; font-size: 1.3em; font-weight: bold; color: #004a99; } .intermediate-results p { margin: 0; font-size: 0.9em; color: #555; } .formula-explanation { font-size: 0.9em; color: #6c757d; margin-top: 15px; padding-top: 10px; border-top: 1px dashed #ccc; } .chart-container { margin-top: 30px; padding: 20px; background-color: #f0f8ff; border-radius: 8px; border: 1px solid #d0e0f0; } .chart-container h3 { text-align: center; color: #004a99; margin-top: 0; margin-bottom: 20px; } canvas { display: block; margin: 0 auto; max-width: 100%; border-radius: 4px; } table { width: 100%; border-collapse: collapse; margin-top: 20px; background-color: #ffffff; box-shadow: 0 1px 3px rgba(0,0,0,0.05); } th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid #ddd; } th { background-color: #004a99; color: #ffffff; font-weight: bold; } tr:nth-child(even) { background-color: #f2f2f2; } .table-caption { font-size: 0.9em; color: #6c757d; text-align: center; margin-top: 10px; display: block; } .article-section { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; } .article-section:first-of-type { border-top: none; margin-top: 0; padding-top: 0; } .article-section h2, .article-section h3 { color: #004a99; margin-bottom: 15px; } .article-section h2 { font-size: 1.8em; border-bottom: 2px solid #004a99; padding-bottom: 5px; } .article-section h3 { font-size: 1.4em; } .article-section p, .article-section ul, .article-section ol { margin-bottom: 15px; color: #444; } .article-section ul { padding-left: 25px; } .article-section li { margin-bottom: 8px; } .faq-item { margin-bottom: 15px; padding: 10px; background-color: #fdfdfd; border-left: 3px solid #004a99; border-radius: 3px; } .faq-item strong { color: #004a99; display: block; margin-bottom: 5px; } .related-links { margin-top: 20px; padding: 15px; background-color: #f0f8ff; border-radius: 5px; border: 1px solid #d0e0f0; } .related-links ul { list-style: none; padding: 0; margin: 0; } .related-links li { margin-bottom: 10px; } .related-links a { color: #004a99; text-decoration: none; font-weight: bold; } .related-links a:hover { text-decoration: underline; } .related-links p { margin-bottom: 10px; font-style: italic; color: #555; } /* Responsive adjustments */ @media (max-width: 768px) { .container { margin: 10px; padding: 15px; } .btn { flex: 1 1 100%; /* Stack buttons on smaller screens */ min-width: unset; } .button-group { flex-direction: column; gap: 10px; } .intermediate-results { flex-direction: column; gap: 10px; } .intermediate-results div { border-bottom: 1px dashed #ccc; padding-bottom: 10px; } .intermediate-results div:last-child { border-bottom: none; padding-bottom: 0; } .calc-header h1 { font-size: 1.8em; } .primary-result { font-size: 2em; } }

Rug Weight Calculator

Effortlessly estimate the weight of your rug in kilograms based on its dimensions and material properties.

Enter the length of your rug in meters (e.g., 3).
Enter the width of your rug in meters (e.g., 2).
Wool (approx. 0.8 kg/m²) Synthetic (e.g., Polypropylene, Polyester) (approx. 1.2 kg/m²) Cotton/Viscose (approx. 1.5 kg/m²) Jute/Sisal (approx. 2.0 kg/m²) Natural Fiber (e.g., Seagrass, Bamboo) (approx. 0.5 kg/m²) Custom Select the primary material of your rug or choose 'Custom'.
Enter the density in kilograms per square meter (kg/m²).

Rug Weight Calculation Results

0.00 kg
0.00

Rug Area

0.0 kg/m²

Material Density

Area x Density

Calculation

The total weight of the rug is calculated by multiplying its surface area (Length x Width) by the density of its primary material.

Rug Weight vs. Material Density

Estimated rug weight for a 3m x 2m rug across different material densities.
Rug Dimension Unit Value
Rug Length Meters (m) 3.00
Rug Width Meters (m) 2.00
Area Square Meters (m²) 6.00
Material Density Kilograms per Square Meter (kg/m²) 0.8
Estimated Weight Kilograms (kg) 4.80
Summary of input values and calculated rug weight.

What is Rug Weight Estimation?

Rug weight estimation is the process of calculating how heavy a rug is likely to be, typically measured in kilograms. This is crucial for various practical reasons, including determining shipping costs, planning for installation and handling, understanding material quality, and even for inventory management by retailers and manufacturers. Unlike simple calculators, a rug weight calculator uses specific physical properties of the rug, namely its dimensions (length and width) and the density of its constituent materials, to derive an accurate estimate. This involves understanding that different fibers and construction methods result in varying weights per square meter.

Who should use a rug weight calculator?

  • Online Shoppers: To anticipate shipping fees and ease of handling upon delivery. High-value or custom rugs often have significant shipping costs tied to their weight.
  • E-commerce Sellers: To accurately quote shipping prices and manage logistics. Knowing the approximate weight helps in choosing appropriate shipping carriers and packaging.
  • Rug Manufacturers & Wholesalers: For inventory valuation, production planning, and bulk shipping logistics.
  • Interior Designers & Installers: To plan for the physical placement and installation of rugs, especially in large-scale projects.
  • Homeowners: When moving or purchasing large rugs, understanding the weight is important for personal transport or hiring moving services.

Common Misconceptions:

  • "All rugs of the same size weigh the same." This is false. Material (wool vs. synthetic vs. natural fibers), pile height, and weave density all significantly impact weight.
  • "Weight directly correlates to quality." While denser, heavier rugs made from natural fibers like wool are often perceived as higher quality, a lightweight rug made from premium silk could also be very high quality and valuable. Material and craftsmanship are better indicators of quality.
  • "Weight is only important for shipping." Weight impacts durability, sound absorption, and thermal insulation properties of a rug. Heavier rugs tend to lie flatter and are less prone to shifting.

Rug Weight Calculation Formula and Mathematical Explanation

The fundamental principle behind calculating rug weight is the relationship between volume, density, and mass. For a rug, we simplify this by considering its area and its material's areal density (weight per unit area).

The Formula

The core formula is:

Rug Weight (kg) = Rug Area (m²) × Material Density (kg/m²)

To use this formula, we first need to calculate the Rug Area:

Rug Area (m²) = Rug Length (m) × Rug Width (m)

Therefore, the complete calculation flow is:

  1. Measure the length and width of the rug in meters.
  2. Calculate the rug's area by multiplying its length by its width.
  3. Determine the approximate areal density (weight per square meter) of the rug's primary material. This value is often provided by manufacturers or can be estimated based on common material types.
  4. Multiply the calculated rug area by the material density to find the total estimated weight of the rug in kilograms.

Variable Explanations

Let's break down each component:

  • Rug Length (L): The longest dimension of the rug. Measured in meters (m).
  • Rug Width (W): The shorter dimension of the rug. Measured in meters (m).
  • Rug Area (A): The total surface area of the rug. Calculated as A = L × W. Measured in square meters (m²).
  • Material Density (D): This is the areal density, representing how much a square meter of the rug's material weighs. This accounts for the type of fiber, the thickness of the pile, and the tightness of the weave. Measured in kilograms per square meter (kg/m²).
  • Rug Weight (M): The final estimated total mass of the rug. Calculated as M = A × D. Measured in kilograms (kg).

Variables Table

Variable Meaning Unit Typical Range (for areal density)
Rug Length (L) The length of the rug Meters (m) N/A (User Input)
Rug Width (W) The width of the rug Meters (m) N/A (User Input)
Rug Area (A) Surface area of the rug Square Meters (m²) Calculated (L x W)
Material Density (D) Weight per unit area of rug material Kilograms per Square Meter (kg/m²) 0.5 – 3.0+ kg/m² (Varies widely)
Rug Weight (M) Total estimated weight of the rug Kilograms (kg) Calculated (A x D)

The rug weight calculator simplifies this by allowing users to input dimensions and select a material type, which maps to a pre-defined density value. This makes the calculation accessible without needing precise material specifications.

Practical Examples (Real-World Use Cases)

Understanding rug weight is essential for planning and budgeting. Here are a couple of practical scenarios:

Example 1: Shipping a Large Area Rug

Sarah purchased a large 4m x 3m Persian wool rug online. The estimated material density for this type of hand-knotted wool rug is around 1.3 kg/m². She needs to arrange shipping from the seller to her home.

  • Inputs:
  • Rug Length: 4 meters
  • Rug Width: 3 meters
  • Material Density: 1.3 kg/m² (Wool)

Calculation:

  • Rug Area = 4 m × 3 m = 12 m²
  • Rug Weight = 12 m² × 1.3 kg/m² = 15.6 kg

Result Interpretation: The rug weighs approximately 15.6 kilograms. This weight is significant enough that standard parcel shipping might be expensive. Sarah should inquire about freight options or check if the seller offers specific rug shipping services. Knowing this weight helps her budget accurately for the ~ $50-$100 shipping cost typically associated with items of this weight and size.

Example 2: Installing a Heavy Synthetic Rug in a Home Office

Mark is replacing the carpet in his home office with a durable 2.5m x 1.8m synthetic rug (e.g., polypropylene). He plans to install it himself and needs to know if he can move it alone.

  • Inputs:
  • Rug Length: 2.5 meters
  • Rug Width: 1.8 meters
  • Material Density: 1.1 kg/m² (Synthetic)

Calculation:

  • Rug Area = 2.5 m × 1.8 m = 4.5 m²
  • Rug Weight = 4.5 m² × 1.1 kg/m² = 4.95 kg

Result Interpretation: The rug weighs approximately 4.95 kg. This is a relatively light weight for its size. Mark can comfortably carry this rug by himself to his office for installation without needing assistance. This weight also suggests it will be easy to vacuum and maintain.

Using a reliable rug weight calculator like this one ensures accurate estimates for such decisions, preventing surprises related to logistics and handling.

How to Use This Rug Weight Calculator

Our intuitive Rug Weight Calculator is designed for ease of use. Follow these simple steps:

  1. Enter Rug Dimensions: Input the precise length and width of your rug into the respective fields. Ensure you are using meters (m) as the unit. If your measurements are in feet or centimeters, convert them first (1 meter ≈ 3.28 feet; 1 meter = 100 centimeters).
  2. Select Material Density: Choose the primary material of your rug from the dropdown list. Common options like Wool, Synthetic, Cotton, Jute, etc., are provided with typical areal density values (kg/m²). If your rug's material is not listed or you know its specific density, select 'Custom' and enter the exact value in kg/m² in the field that appears.
  3. Click 'Calculate Weight': Once all inputs are entered, click the 'Calculate Weight' button.

How to Read Results

The calculator will immediately display:

  • Primary Result (Total Weight): The most prominent number, shown in kilograms (kg), is the estimated total weight of your rug.
  • Intermediate Values: Below the main result, you'll find the calculated Rug Area (m²) and the Material Density (kg/m²) used in the calculation.
  • Formula Used: A brief description of the calculation performed (Area x Density).
  • Summary Table: A table reiterates your input values and the calculated results for clarity.
  • Chart: A visual representation showing how the rug's weight changes with different material densities.

Decision-Making Guidance

Use the calculated weight to make informed decisions:

  • Shipping Costs: Get accurate shipping quotes from carriers. A heavier rug will invariably cost more to ship.
  • Handling and Installation: Determine if you can move the rug yourself or if you'll need help. Very heavy rugs may require professional installation.
  • Underlayment Needs: While not directly calculated, heavier rugs may benefit from specific types of non-slip underlayment to prevent shifting.
  • Inventory Management: For businesses, this provides a quick estimate for stocktaking and warehousing space planning.

Don't forget to use the 'Copy Results' button to save or share the information easily. The 'Reset' button allows you to start fresh with default values.

Key Factors That Affect Rug Weight Results

While the core formula is straightforward, several factors can influence the actual weight of a rug compared to the calculator's estimate. Understanding these nuances helps in refining your expectations.

  1. Pile Height and Density: A rug with a very high pile (e.g., shag) or a dense, tightly knotted pile will weigh more per square meter than a flatweave rug of the same material. The 'Material Density' selected in the calculator is an average; actual pile characteristics can cause deviations.
  2. Material Composition: Even within categories like 'Wool' or 'Synthetic', there's variation. For example, different types of wool (e.g., Merino vs. coarser wool) have slightly different densities. Similarly, blends (e.g., wool-silk blend) will have a composite density not perfectly captured by a single selection.
  3. Backing Material: Most rugs have a backing (often made of jute, cotton, or synthetic latex). This backing adds extra weight. If the rug is particularly heavy due to its backing, the calculated weight might be slightly underestimated. This is a common factor in rug shipping cost estimation.
  4. Moisture Content: Natural fibers like wool and jute can absorb moisture from the air. A rug weighed in a humid environment might be slightly heavier than one weighed in a dry climate. This is usually a minor factor but can be relevant for precise measurements.
  5. Wear and Tear: An older rug might have lost some fibers or experienced compaction over time, potentially making it slightly lighter than its original manufactured weight.
  6. Manufacturing Tolerances: Like any manufactured product, there are slight variations in the exact dimensions and material density from one rug to another, even within the same production batch. Our calculator provides a close estimate, not an exact factory specification.

Factors like rug material quality and construction techniques indirectly influence density and thus weight, playing a role in both the feel and longevity of the rug.

Frequently Asked Questions (FAQ)

Q1: How accurate is this rug weight calculator?

A: The calculator provides a good estimate based on standard material densities and user-input dimensions. Accuracy depends on selecting the correct material density and precise measurements. For exact weights, the rug must be weighed on a scale.

Q2: What is a "typical" weight for a standard area rug (e.g., 2m x 3m)?

A: For a 2m x 3m rug (6 m²), the weight can range significantly: a lightweight natural fiber rug might be around 3 kg (6 m² * 0.5 kg/m²), while a dense wool rug could be 7.8 kg (6 m² * 1.3 kg/m²), or even higher for very plush rugs.

Q3: Does the calculator account for rug thickness?

A: Not directly. Thickness is implicitly factored into the 'Material Density' (kg/m²). Denser materials or thicker piles generally result in higher areal density values.

Q4: My rug feels much heavier than the calculator suggests. Why?

A: Possible reasons include: an underestimated material density, a very dense pile, a heavy backing material not accounted for, or moisture absorption. Double-check your inputs and material selection.

Q5: How do I convert rug dimensions from feet to meters?

A: Divide the measurement in feet by 3.281. For example, a 10ft rug is approximately 3.05 meters (10 / 3.281).

Q6: Is rug weight related to its value?

A: Sometimes indirectly. Hand-knotted rugs made from dense, high-quality materials like fine wool or silk tend to be heavier and more valuable. However, value is primarily determined by craftsmanship, design, material rarity, and condition, not solely weight.

Q7: Can I use this calculator for carpet tiles?

A: While the principle is the same (area x density), carpet tiles often have different density specifications and are usually sold by box or square meter, with weight per box specified. This calculator is best suited for area rugs.

Q8: How does rug weight affect thermal insulation?

A: Heavier rugs, particularly those made from dense natural fibers like wool, tend to offer better thermal insulation. They trap more air within their pile, helping to keep a room warmer in winter and cooler in summer. Understanding rug material properties helps evaluate this.

Related Tools and Internal Resources

var chartInstance = null; // Global variable to hold chart instance function getElement(id) { return document.getElementById(id); } function validateInput(inputId, errorId, min, max) { var input = getElement(inputId); var errorElement = getElement(errorId); var value = parseFloat(input.value); var isValid = true; errorElement.textContent = "; input.parentNode.classList.remove('error'); if (isNaN(value)) { errorElement.textContent = 'Please enter a valid number.'; input.parentNode.classList.add('error'); isValid = false; } else if (value <= 0) { errorElement.textContent = 'Value must be positive.'; input.parentNode.classList.add('error'); isValid = false; } else if (min !== undefined && value max) { errorElement.textContent = 'Value must be no more than ' + max + '.'; input.parentNode.classList.add('error'); isValid = false; } return isValid; } function calculateRugWeight() { var rugLengthInput = getElement("rugLength"); var rugWidthInput = getElement("rugWidth"); var materialDensitySelect = getElement("materialDensity"); var customDensityValueInput = getElement("customDensityValue"); var rugLengthError = getElement("rugLengthError"); var rugWidthError = getElement("rugWidthError"); var materialDensityError = getElement("materialDensityError"); var customDensityValueError = getElement("customDensityValueError"); var allValid = true; if (!validateInput("rugLength", "rugLengthError", 0.1)) allValid = false; if (!validateInput("rugWidth", "rugWidthError", 0.1)) allValid = false; var densityValue; var selectedDensityText = ""; if (materialDensitySelect.value === "custom") { if (!validateInput("customDensityValue", "customDensityValueError", 0.1)) { allValid = false; } else { densityValue = parseFloat(customDensityValueInput.value); selectedDensityText = densityValue.toFixed(2) + " kg/m² (Custom)"; } } else { densityValue = parseFloat(materialDensitySelect.value); var selectedOption = materialDensitySelect.options[materialDensitySelect.selectedIndex]; selectedDensityText = selectedOption.text.split('(')[1].replace(')',"); } if (!allValid) { getElement("results").style.display = "none"; return; } var rugLength = parseFloat(rugLengthInput.value); var rugWidth = parseFloat(rugWidthInput.value); var rugArea = rugLength * rugWidth; var totalWeight = rugArea * densityValue; getElement("totalWeight").textContent = totalWeight.toFixed(2) + " kg"; getElement("rugArea").textContent = rugArea.toFixed(2); getElement("selectedDensity").textContent = selectedDensityText; getElement("formulaUsed").textContent = "Area × Density"; getElement("results").style.display = "block"; // Update table getElement("tableLength").textContent = rugLength.toFixed(2); getElement("tableWidth").textContent = rugWidth.toFixed(2); getElement("tableArea").textContent = rugArea.toFixed(2); getElement("tableDensity").textContent = densityValue.toFixed(1); getElement("tableWeight").textContent = totalWeight.toFixed(2) + " kg"; updateChart(rugArea, densityValue, totalWeight); } function resetCalculator() { getElement("rugLength").value = "3"; getElement("rugWidth").value = "2"; getElement("materialDensity").value = "0.8"; // Default to Wool getElement("customDensityValue").value = "1.0"; getElement("customDensityGroup").style.display = "none"; getElement("materialDensityError").textContent = "; getElement("rugLengthError").textContent = "; getElement("rugWidthError").textContent = "; getElement("customDensityValueError").textContent = "; getElement("results").style.display = "none"; // Reset table values getElement("tableLength").textContent = "3.00"; getElement("tableWidth").textContent = "2.00"; getElement("tableArea").textContent = "6.00"; getElement("tableDensity").textContent = "0.8"; getElement("tableWeight").textContent = "4.80 kg"; // Reset chart if it exists if (chartInstance) { chartInstance.destroy(); chartInstance = null; } // Optionally re-render a blank canvas or default chart state initChart(); } function copyResults() { var totalWeight = getElement("totalWeight").textContent; var rugArea = getElement("rugArea").textContent; var selectedDensity = getElement("selectedDensity").textContent; var length = getElement("tableLength").textContent; var width = getElement("tableWidth").textContent; var density = getElement("tableDensity").textContent; var resultsText = "— Rug Weight Calculation Results —\n\n"; resultsText += "Estimated Weight: " + totalWeight + "\n"; resultsText += "Rug Area: " + rugArea + " m²\n"; resultsText += "Material Density: " + selectedDensity + "\n\n"; resultsText += "— Key Inputs —\n"; resultsText += "Rug Length: " + length + " m\n"; resultsText += "Rug Width: " + width + " m\n"; resultsText += "Material Density Used: " + density + " kg/m²\n"; resultsText += "\nCalculated using: Area x Density"; // Use a temporary textarea to copy text var textArea = document.createElement("textarea"); textArea.value = resultsText; 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 ? 'Results copied!' : 'Failed to copy results.'; // Optional: Show a temporary message to the user var tempMessage = document.createElement('div'); tempMessage.textContent = msg; tempMessage.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: #004a99; color: white; padding: 15px; border-radius: 5px; z-index: 1000;'; document.body.appendChild(tempMessage); setTimeout(function() { document.body.removeChild(tempMessage); }, 2000); } catch (err) { console.error('Fallback: Manual copy required.', err); var tempMessage = document.createElement('div'); tempMessage.textContent = 'Copy failed. Please copy manually.'; tempMessage.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: #dc3545; color: white; padding: 15px; border-radius: 5px; z-index: 1000;'; document.body.appendChild(tempMessage); setTimeout(function() { document.body.removeChild(tempMessage); }, 2000); } document.body.removeChild(textArea); } function initChart() { var ctx = getElement('weightChart').getContext('2d'); var dataSeries1 = []; // Weights for different densities var densities = [0.5, 0.8, 1.0, 1.1, 1.2, 1.3, 1.5, 1.8, 2.0, 2.5, 3.0]; // Example densities var rugArea = parseFloat(getElement("rugArea").textContent); if (isNaN(rugArea) || rugArea === 0) rugArea = 6.0; // Default area if calculation hasn't run densities.forEach(function(density) { dataSeries1.push({ x: density, y: rugArea * density }); }); chartInstance = new Chart(ctx, { type: 'line', data: { datasets: [{ label: 'Estimated Rug Weight (kg)', data: dataSeries1, borderColor: '#004a99', backgroundColor: 'rgba(0, 74, 153, 0.1)', tension: 0.1, fill: true }] }, options: { responsive: true, maintainAspectRatio: true, scales: { x: { title: { display: true, text: 'Material Density (kg/m²)' }, ticks: { callback: function(value) { return value + ' kg/m²'; } } }, y: { title: { display: true, text: 'Weight (kg)' }, beginAtZero: true } }, plugins: { 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; } } } } } }); } function updateChart(currentArea, currentDensity, currentWeight) { if (chartInstance) { chartInstance.destroy(); } var ctx = getElement('weightChart').getContext('2d'); var dataSeries1 = []; var densities = [0.5, 0.8, 1.0, 1.1, 1.2, 1.3, 1.5, 1.8, 2.0, 2.5, 3.0]; // Example densities // Use the actual area from the calculator or a default if not calculated yet var area = currentArea > 0 ? currentArea : parseFloat(getElement("rugArea").textContent) || 6.0; densities.forEach(function(density) { dataSeries1.push({ x: density, y: area * density }); }); // Add the current calculation point if it's not already in the example densities var densityExists = densities.some(function(d) { return d === currentDensity; }); if (!densityExists && currentDensity > 0) { dataSeries1.push({ x: currentDensity, y: currentWeight }); dataSeries1.sort(function(a, b) { return a.x – b.x; }); // Keep sorted by density } chartInstance = new Chart(ctx, { type: 'line', data: { datasets: [{ label: 'Estimated Rug Weight (kg)', data: dataSeries1, borderColor: '#004a99', backgroundColor: 'rgba(0, 74, 153, 0.1)', tension: 0.1, fill: true }] }, options: { responsive: true, maintainAspectRatio: true, scales: { x: { title: { display: true, text: 'Material Density (kg/m²)' }, ticks: { callback: function(value) { // Find the corresponding density value from dataSeries1 for this tick var dataPoint = dataSeries1.find(function(dp) { return dp.x === value; }); if (dataPoint) { return dataPoint.x.toFixed(1) + ' kg/m²'; } return value; // Fallback if no exact match found } } }, y: { title: { display: true, text: 'Weight (kg)' }, beginAtZero: true } }, plugins: { 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; } } } } } }); } // Handle showing/hiding custom density input getElement("materialDensity").onchange = function() { var customDensityGroup = getElement("customDensityGroup"); if (this.value === "custom") { customDensityGroup.style.display = "flex"; // Use flex to maintain input-group layout } else { customDensityGroup.style.display = "none"; } }; // Initial setup document.addEventListener('DOMContentLoaded', function() { initChart(); // Initialize chart on page load // Run calculation once on load to populate initial results if defaults are present calculateRugWeight(); });

Leave a Comment