Aluminium Rectangular Pipe Weight Calculator

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Aluminium Rectangular Pipe Weight Calculator

Calculate Aluminium Rectangular Pipe Weight

Enter the outer width of the rectangular pipe in millimeters.
Enter the outer height of the rectangular pipe in millimeters.
Enter the thickness of the pipe wall in millimeters.
Enter the total length of the pipe in millimeters.

Calculation Results

Inner Width (mm):
Inner Height (mm):
Cross-Sectional Area (mm²):
Volume (mm³):
Weight (kg):
Weight = Volume × Density. Density of Aluminium ≈ 2.7 g/cm³ (2700 kg/m³ or 0.0000027 g/mm³).
Volume = (Outer Area – Inner Area) × Length. Outer Area = Outer Width × Outer Height. Inner Area = Inner Width × Inner Height.
Assumptions: Uniform wall thickness, pure aluminium density.
Weight vs. Pipe Length and Wall Thickness
Weight Calculation Breakdown
Parameter Unit Value
Outer Width mm
Outer Height mm
Wall Thickness mm
Pipe Length mm
Inner Width mm
Inner Height mm
Cross-Sectional Area mm²
Volume mm³
Weight kg

What is an Aluminium Rectangular Pipe Weight Calculator?

What is an Aluminium Rectangular Pipe Weight Calculator?

An aluminium rectangular pipe weight calculator is a specialized digital tool designed to quickly and accurately determine the mass of a given aluminium rectangular pipe. This calculator is indispensable for engineers, fabricators, architects, procurement specialists, and DIY enthusiasts who need to estimate the weight of aluminium profiles for various applications. By inputting key dimensions such as outer width, outer height, wall thickness, and pipe length, the calculator computes the total weight, factoring in the density of aluminium. This aluminium rectangular pipe weight calculator simplifies complex calculations, saving time and reducing the potential for errors in material estimation and costing.

This tool is crucial for anyone involved in projects where the precise quantity and weight of aluminium are important. This includes structural design, manufacturing, shipping, and cost analysis. It helps in understanding material requirements, planning logistics, ensuring structural integrity, and managing project budgets effectively. The accuracy provided by an aluminium rectangular pipe weight calculator is paramount for successful project execution.

A common misconception is that all aluminium alloys have the same density. While the density of aluminium is generally around 2.7 g/cm³, different alloys can have slight variations. This calculator typically uses this standard density value for simplicity. Another misconception is that the internal dimensions are always directly proportional to the outer ones; this is true, but the interaction with wall thickness needs precise calculation, which this aluminium rectangular pipe weight calculator handles.

Aluminium Rectangular Pipe Weight Formula and Mathematical Explanation

The calculation of the weight of an aluminium rectangular pipe relies on fundamental geometric principles and the density of aluminium. The core idea is to determine the volume of the aluminium material itself and then multiply it by its density. Here's a step-by-step breakdown:

  1. Calculate Inner Dimensions: Since the pipe has a certain wall thickness, the internal dimensions will be smaller than the external ones.
    • Inner Width = Outer Width – (2 × Wall Thickness)
    • Inner Height = Outer Height – (2 × Wall Thickness)
  2. Calculate Outer Cross-Sectional Area: This is the area of the rectangle defined by the outer dimensions.
    • Outer Area = Outer Width × Outer Height
  3. Calculate Inner Cross-Sectional Area: This is the area of the rectangle defined by the inner dimensions.
    • Inner Area = Inner Width × Inner Height
  4. Calculate Cross-Sectional Area of Aluminium: This is the area of the aluminium material itself in a cross-section.
    • Cross-Sectional Area = Outer Area – Inner Area
  5. Calculate Volume of Aluminium: Multiply the cross-sectional area of the aluminium by the length of the pipe.
    • Volume = Cross-Sectional Area × Pipe Length
  6. Calculate Weight: Multiply the volume of aluminium by its density.
    • Weight = Volume × Density

The density of aluminium is a critical factor. The standard density for most common aluminium alloys is approximately 2.7 grams per cubic centimeter (g/cm³). When working with millimeters, this translates to 0.0000027 grams per cubic millimeter (g/mm³), or more conveniently, 2700 kilograms per cubic meter (kg/m³). For this calculator, we will use a density value compatible with the input units (e.g., 0.0000027 g/mm³ if length and dimensions are in mm, to yield weight in grams, which is then converted to kg).

Variables Table

Variable Meaning Unit Typical Range
Outer Width (W_o) The external width of the rectangular pipe. mm 5 – 1000+
Outer Height (H_o) The external height of the rectangular pipe. mm 5 – 1000+
Wall Thickness (t) The thickness of the pipe wall. Must be less than half of the smaller outer dimension. mm 0.5 – 50+
Pipe Length (L) The total length of the pipe. mm 10 – 10000+
Inner Width (W_i) The calculated internal width of the pipe. mm Calculated
Inner Height (H_i) The calculated internal height of the pipe. mm Calculated
Cross-Sectional Area (A) The area of the aluminium material in the pipe's cross-section. mm² Calculated
Volume (V) The total volume of the aluminium material in the pipe. mm³ Calculated
Density (ρ) The mass per unit volume of aluminium. g/mm³ ~0.0000027 (for 2.7 g/cm³)
Weight (Wt) The total mass of the pipe. kg Calculated

Practical Examples (Real-World Use Cases)

Example 1: Fabrication of a Support Frame

A workshop is fabricating a rectangular support frame for a small industrial machine. They need to determine the weight of the aluminium rectangular pipes they will use.

  • Pipe Dimensions: 60mm (Outer Width) × 40mm (Outer Height) × 4mm (Wall Thickness)
  • Pipe Length: 2500mm

Using the aluminium rectangular pipe weight calculator:

  • Input: Outer Width = 60, Outer Height = 40, Wall Thickness = 4, Pipe Length = 2500
  • Outputs:
    • Inner Width = 60 – (2 * 4) = 52 mm
    • Inner Height = 40 – (2 * 4) = 32 mm
    • Cross-Sectional Area = (60*40) – (52*32) = 2400 – 1664 = 736 mm²
    • Volume = 736 mm² * 2500 mm = 1,840,000 mm³
    • Weight = 1,840,000 mm³ * 0.0000027 g/mm³ ≈ 4968 grams = 4.97 kg

Interpretation: Each 2.5-meter section of this pipe weighs approximately 4.97 kg. This information is vital for calculating the total material cost, planning for safe lifting and handling during fabrication, and ensuring the frame can support the intended load. A procurement manager can use this to order the exact amount of material needed, preventing overspending or shortages. This is a key use of an aluminium rectangular pipe weight calculator.

Example 2: Architectural Cladding Project

An architectural firm is designing a facade element that uses aluminium rectangular pipes as decorative and structural components. They need to estimate the total weight for structural load calculations and shipping logistics.

  • Pipe Dimensions: 100mm (Outer Width) × 50mm (Outer Height) × 5mm (Wall Thickness)
  • Total Project Length: 150 meters (which is 150,000 mm)

Using the aluminium rectangular pipe weight calculator for a single segment and then scaling:

  • Input: Outer Width = 100, Outer Height = 50, Wall Thickness = 5, Pipe Length = 1000 (for unit calculation)
  • Outputs for 1 meter (1000mm):
    • Inner Width = 100 – (2 * 5) = 90 mm
    • Inner Height = 50 – (2 * 5) = 40 mm
    • Cross-Sectional Area = (100*50) – (90*40) = 5000 – 3600 = 1400 mm²
    • Volume = 1400 mm² * 1000 mm = 1,400,000 mm³
    • Weight = 1,400,000 mm³ * 0.0000027 g/mm³ ≈ 3780 grams = 3.78 kg per meter
  • Total Weight Calculation: 3.78 kg/meter × 150 meters = 567 kg

Interpretation: Each meter of this pipe weighs approximately 3.78 kg. For the entire project requiring 150 meters, the total weight is about 567 kg. This weight is critical for the structural engineer to calculate the load on the building's primary structure and facade supports. It also informs the shipping company about the total mass to be transported, helping in planning the logistics and ensuring compliance with transportation regulations. This demonstrates the practical application of an aluminium rectangular pipe weight calculator in larger projects.

How to Use This Aluminium Rectangular Pipe Weight Calculator

Using this aluminium rectangular pipe weight calculator is straightforward. Follow these simple steps to get your weight estimation instantly:

  1. Input Outer Dimensions: Enter the exact external width and height of the rectangular pipe in millimeters (mm) into the respective fields ("Outer Width" and "Outer Height").
  2. Input Wall Thickness: Provide the thickness of the aluminium wall in millimeters (mm) in the "Wall Thickness" field. Ensure this value is realistic and less than half of the smallest outer dimension.
  3. Input Pipe Length: Enter the total length of the pipe you are calculating the weight for, also in millimeters (mm), into the "Pipe Length" field.
  4. Click "Calculate Weight": Once all fields are filled with valid numerical data, click the "Calculate Weight" button.

How to Read Results:

  • Primary Result (Highlighted): The most prominent display shows the total calculated weight of the aluminium pipe in kilograms (kg).
  • Intermediate Values: Below the primary result, you will find key calculated values: Inner Width, Inner Height, Cross-Sectional Area (of the aluminium material), and Volume (of the aluminium material). These provide a breakdown of the calculation process.
  • Table Breakdown: A detailed table summarizes all input parameters and calculated results for a comprehensive overview.
  • Formula Explanation: A brief explanation of the underlying formula (Weight = Volume × Density) and assumptions is provided for transparency.

Decision-Making Guidance:

  • Procurement: Use the total weight to order the precise amount of aluminium needed for your project, optimizing material costs.
  • Structural Engineering: The calculated weight helps in determining the load imposed by the aluminium components on the overall structure.
  • Logistics and Handling: Knowing the weight per meter or per section aids in planning shipping, transportation, and safe manual or mechanical handling.
  • Budgeting: Estimate the cost of aluminium materials more accurately by multiplying the total weight by the current market price per kilogram.

Use the "Reset" button to clear all fields and start fresh. The "Copy Results" button allows you to easily transfer the calculated data to reports, spreadsheets, or other documents. This aluminium rectangular pipe weight calculator aims to be a reliable tool for your material estimation needs.

Key Factors That Affect Aluminium Rectangular Pipe Weight Results

While the aluminium rectangular pipe weight calculator provides a precise calculation based on input dimensions, several real-world factors can influence the actual weight and its implications:

  1. Aluminium Alloy: The density of aluminium varies slightly depending on the specific alloy used (e.g., 6061, 7075). While this calculator uses a standard density of approximately 2.7 g/cm³, some specialized alloys might have densities that differ by a small percentage. Always confirm the alloy if extreme precision is required for critical applications. This is a key assumption in any aluminium rectangular pipe weight calculator.
  2. Manufacturing Tolerances: Real-world pipes may not have perfectly uniform wall thicknesses or exact outer dimensions as specified. Slight deviations due to manufacturing processes can lead to minor variations in the actual weight compared to the calculated weight.
  3. Surface Treatments and Coatings: If the aluminium pipe undergoes processes like anodizing, powder coating, or painting, these add a thin layer of material, increasing the overall weight. The calculator does not account for these added layers.
  4. Internal Features: Some specialized rectangular profiles might have internal ribs, chamfers, or varying internal structures that affect the volume of material used. This calculator assumes a simple hollow rectangular prism with consistent wall thickness.
  5. Temperature Variations: Materials expand and contract with temperature. While the effect on density and dimensions for aluminium at typical ambient temperatures is minimal for most practical purposes, it can become relevant in extreme temperature environments. The calculator assumes standard conditions.
  6. Measurement Accuracy: The accuracy of the final weight calculation is directly dependent on the precision of the measurements entered into the calculator. Inaccurate input dimensions will lead to inaccurate weight estimates. Double-checking measurements is crucial.
  7. Scrap and Offcuts: When fabricating, there will inevitably be offcuts and waste. While the calculator determines the weight of the usable pipe, project planning must account for the total material purchased, including waste, which often increases the overall project material cost.

Understanding these factors helps in interpreting the calculator's output and making informed decisions regarding material procurement and project planning. For mission-critical applications, consulting material specifications and potentially performing physical weight checks might be necessary.

Frequently Asked Questions (FAQ)

What is the standard density of aluminium used in this calculator?

This calculator uses the standard density of aluminium, which is approximately 2.7 grams per cubic centimeter (g/cm³). This is equivalent to 2700 kg/m³ or 0.0000027 g/mm³.

Can this calculator be used for round or square aluminium pipes?

No, this specific calculator is designed only for aluminium rectangular pipe weight. Separate calculators or formulas are needed for round (tubes) or square (which is a special case of rectangular, but the formula might be simplified) profiles.

What if my pipe has a non-uniform wall thickness?

This calculator assumes a uniform wall thickness for all sides. For pipes with significantly non-uniform walls, you would need to use a more complex calculation, possibly averaging the thickness or breaking the profile into simpler geometric shapes.

Does the calculator account for different aluminium alloys?

No, this calculator uses a single, standard density value for aluminium. While common alloys have very similar densities, significant differences may exist for specialized alloys. For high-precision work with specific alloys, consult their material data sheets.

What are the units for the inputs and outputs?

All linear dimensions (Outer Width, Outer Height, Wall Thickness, Pipe Length) should be entered in millimeters (mm). The output weight is provided in kilograms (kg).

Why is the inner dimension calculated as Outer Dimension – 2 * Wall Thickness?

Because the wall thickness exists on both sides of the dimension. For width, there's a wall on the left and a wall on the right. For height, there's a wall on the top and a wall on the bottom. Subtracting twice the wall thickness correctly determines the internal space.

What happens if I enter a wall thickness that is too large?

If the wall thickness is so large that the calculated inner dimension becomes zero or negative (i.e., twice the wall thickness is greater than or equal to the outer dimension), the calculation might produce erroneous results or indicate an invalid input. The calculator should ideally flag such inputs as invalid.

How accurate is the weight calculation?

The accuracy depends on the precision of your input measurements and the consistency of the aluminium's density. For most standard applications, this calculator provides a highly accurate estimate. For aerospace or critical structural components, verify with specific material certifications.

Related Tools and Internal Resources

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var innerHeight = outerHeight – (2 * wallThickness); var outerArea = outerWidth * outerHeight; var innerArea = innerWidth * innerHeight; var crossSectionalArea = outerArea – innerArea; var volume = crossSectionalArea * pipeLength; // Density of Aluminium in g/mm³ (2.7 g/cm³ = 2700 kg/m³ = 0.0000027 g/mm³) var aluminiumDensity = 0.0000027; var weightInGrams = volume * aluminiumDensity; var weightInKg = weightInGrams / 1000; // Update results display document.getElementById("innerWidthResult").textContent = formatNumber(innerWidth) + " mm"; document.getElementById("innerHeightResult").textContent = formatNumber(innerHeight) + " mm"; document.getElementById("crossSectionalAreaResult").textContent = formatNumber(crossSectionalArea) + " mm²"; document.getElementById("volumeResult").textContent = formatNumber(volume) + " mm³"; document.getElementById("weightResult").textContent = formatNumber(weightInKg) + " kg"; document.getElementById("primary-result").textContent = formatNumber(weightInKg) + " kg"; // Update table document.getElementById("tableOuterWidth").textContent = formatNumber(outerWidth); document.getElementById("tableOuterHeight").textContent = formatNumber(outerHeight); document.getElementById("tableWallThickness").textContent = formatNumber(wallThickness); document.getElementById("tablePipeLength").textContent = formatNumber(pipeLength); document.getElementById("tableInnerWidth").textContent = formatNumber(innerWidth); document.getElementById("tableInnerHeight").textContent = formatNumber(innerHeight); document.getElementById("tableCrossSectionalArea").textContent = formatNumber(crossSectionalArea); document.getElementById("tableVolume").textContent = formatNumber(volume); document.getElementById("tableWeight").textContent = formatNumber(weightInKg); document.getElementById("results-container").style.display = "block"; updateChart(outerWidth, outerHeight, wallThickness, pipeLength); } function resetCalculator() { document.getElementById("outerWidth").value = "60"; document.getElementById("outerHeight").value = "40"; 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var assumptions = "Assumptions: Uniform wall thickness, pure aluminium density (2.7 g/cm³)."; var resultsText = "Aluminium Rectangular Pipe Weight Calculation:\n\n"; resultsText += "Primary Result (Weight): " + primaryResult + "\n"; resultsText += "—————————————-\n"; resultsText += "Inner Width: " + innerWidth + "\n"; resultsText += "Inner Height: " + innerHeight + "\n"; resultsText += "Cross-Sectional Area: " + crossSectionalArea + "\n"; resultsText += "Volume: " + volume + "\n"; resultsText += "Weight: " + weight + "\n\n"; resultsText += assumptions; // Use a temporary textarea to copy 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 to clipboard!' : 'Copying failed!'; console.log(msg); // Optionally provide user feedback alert(msg); } catch (err) { console.error('Fallback: Oops, unable to copy', err); alert('Copying failed. Please copy manually.'); } document.body.removeChild(textArea); } // Charting Logic var myChart = null; function updateChart(outerWidth, outerHeight, wallThickness, pipeLength) { var canvas = document.getElementById('weightChart'); if (!canvas) return; var ctx = canvas.getContext('2d'); if (!ctx) return; // Destroy previous chart instance if it exists if (myChart) { myChart.destroy(); } var dataPointsLength = 5; // Number of data points for length variation var dataPointsThickness = 5; // Number of data points for thickness variation var lengths = []; var weightsByLength = []; var baseLength = pipeLength > 0 ? pipeLength : 1000; // Use input length or default var lengthStep = baseLength / (dataPointsLength – 1); for (var i = 0; i < dataPointsLength; i++) { var currentLength = baseLength – (i * lengthStep); if (currentLength <= 0) currentLength = 1; // Avoid zero or negative length lengths.push(currentLength); var innerW = outerWidth – (2 * wallThickness); var innerH = outerHeight – (2 * wallThickness); var area = (outerWidth * outerHeight) – (innerW * innerH); var vol = area * currentLength; var weight = vol * 0.0000027 / 1000; // kg weightsByLength.push(weight); } // Sort lengths and weights for a cleaner chart for (var i = 0; i < lengths.length; i++) { for (var j = i + 1; j < lengths.length; j++) { if (lengths[i] 0 ? wallThickness : 1; // Use input thickness or default var thicknessStep = baseThickness / (dataPointsThickness – 1); for (var i = 0; i < dataPointsThickness; i++) { var currentThickness = baseThickness – (i * thicknessStep); if (currentThickness <= 0) currentThickness = 0.1; // Avoid zero or negative thickness thicknesses.push(currentThickness); var innerW = outerWidth – (2 * currentThickness); var innerH = outerHeight – (2 * currentThickness); // Ensure inner dimensions are not negative if (innerW < 0) innerW = 0; if (innerH < 0) innerH = 0; var area = (outerWidth * outerHeight) – (innerW * innerH); var vol = area * pipeLength; var weight = vol * 0.0000027 / 1000; // kg weightsByThickness.push(weight); } // Sort thicknesses and weights for a cleaner chart for (var i = 0; i < thicknesses.length; i++) { for (var j = i + 1; j < thicknesses.length; j++) { if (thicknesses[i] < thicknesses[j]) { var tempThk = thicknesses[i]; thicknesses[i] = thicknesses[j]; thicknesses[j] = tempThk; var tempWgt = weightsByThickness[i]; weightsByThickness[i] = weightsByThickness[j]; weightsByThickness[j] = tempWgt; } } } // Combine data for a multi-series chart if desired, or choose one focus // For simplicity, let's show Length variation and Thickness variation separately or combined. // We'll use Length variation as primary series and Thickness variation as secondary, adjusting x-axis labels carefully. // For demonstration, let's create a chart showing weight vs length // and another conceptual series representing weight vs thickness. // A single chart with two distinct series on potentially different scales or with careful labeling is needed. // Let's focus on weight vs length for the primary series on the chart. // And for the second series, we can show how weight changes if we *hypothetically* increase thickness while keeping length constant (this can be confusing). // A better approach is to show weight for two different pipe lengths or two different thicknesses. // Let's simplify: Chart will show Weight vs Pipe Length for the *current* wall thickness. // And then a second series showing Weight vs Wall Thickness for the *current* pipe length. var chartLabels = []; var dataSeries1 = []; // Weight vs Length var dataSeries2 = []; // Weight vs Thickness // Generate labels and data for Weight vs Length var minLen = 100; // Min length for chart display var maxLen = pipeLength * 2; // Max length for chart display var lenStep = (maxLen – minLen) / 4; // 5 points including start and end for (var i = 0; i < 5; i++) { var currentLen = minLen + i * lenStep; var innerW = outerWidth – (2 * wallThickness); var innerH = outerHeight – (2 * wallThickness); if (innerW < 0) innerW = 0; if (innerH < 0) innerH = 0; var area = (outerWidth * outerHeight) – (innerW * innerH); var vol = area * currentLen; var weight = vol * 0.0000027 / 1000; // kg dataSeries1.push(weight); chartLabels.push(currentLen.toFixed(0) + " mm"); } // Generate labels and data for Weight vs Thickness var minThk = 0.5; // Min thickness for chart display var maxThk = Math.min(outerWidth, outerHeight) / 2 – 0.5; // Max thickness before invalid if (maxThk = outerWidth || 2 * currentThicknessPlus1 >= outerHeight) { currentThicknessPlus1 = Math.min(outerWidth, outerHeight) / 2 – 0.1; // Adjust if invalid } var chartLabelsLength = []; var dataSeriesWeightVsLength = []; var dataSeriesWeightVsThicker = []; var numPoints = 5; var lengthRangeMin = 500; // mm var lengthRangeMax = pipeLength * 2; // mm if (lengthRangeMax < lengthRangeMin) lengthRangeMax = lengthRangeMin + 1000; var lengthStepCalc = (lengthRangeMax – lengthRangeMin) / (numPoints – 1); for (var i = 0; i < numPoints; i++) { var currentLength = lengthRangeMin + i * lengthStepCalc; chartLabelsLength.push(currentLength.toFixed(0)); // Series 1: Current thickness var innerW1 = outerWidth – (2 * wallThickness); var innerH1 = outerHeight – (2 * wallThickness); if (innerW1 < 0) innerW1 = 0; if (innerH1 < 0) innerH1 = 0; var area1 = (outerWidth * outerHeight) – (innerW1 * innerH1); var vol1 = area1 * currentLength; var weight1 = vol1 * 0.0000027 / 1000; // kg dataSeriesWeightVsLength.push(weight1); // Series 2: Thickness + 1mm var innerW2 = outerWidth – (2 * currentThicknessPlus1); var innerH2 = outerHeight – (2 * currentThicknessPlus1); if (innerW2 < 0) innerW2 = 0; if (innerH2 < 0) innerH2 = 0; var area2 = (outerWidth * outerHeight) – (innerW2 * innerH2); var vol2 = area2 * currentLength; var weight2 = vol2 * 0.0000027 / 1000; // kg dataSeriesWeightVsThicker.push(weight2); } myChart = new Chart(ctx, { type: 'line', data: { labels: chartLabelsLength, datasets: [{ label: 'Weight vs. Length (Current Thickness)', data: dataSeriesWeightVsLength, borderColor: 'rgba(0, 74, 153, 1)', backgroundColor: 'rgba(0, 74, 153, 0.2)', fill: false, tension: 0.1 }, { label: 'Weight vs. Length (Thickness + 1mm)', data: dataSeriesWeightVsThicker, borderColor: 'rgba(28, 134, 211, 1)', // A slightly lighter blue backgroundColor: 'rgba(28, 134, 211, 0.2)', fill: false, tension: 0.1 }] }, options: { responsive: true, maintainAspectRatio: true, scales: { x: { title: { display: true, text: 'Pipe Length (mm)' } }, 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; } } } } } }); } // Toggle FAQ answers function toggleFaq(element) { var answer = element.nextElementSibling; if (answer.style.display === "block") { answer.style.display = "none"; } else { answer.style.display = "block"; } } // Event Listeners document.getElementById("calculateBtn").onclick = calculateWeight; document.getElementById("resetBtn").onclick = resetCalculator; document.getElementById("copyBtn").onclick = copyResults; // Initial calculation on load with default values window.onload = function() { // Ensure chart canvas is ready before attempting to draw var canvas = document.getElementById('weightChart'); if (canvas) { // Make sure canvas has dimensions, default to something reasonable if CSS doesn't provide it initially canvas.width = canvas.offsetWidth || 600; canvas.height = canvas.offsetHeight || 300; if (canvas.getContext) { updateChart(60, 40, 4, 1000); // Initial call to draw chart } else { console.error("Canvas context not supported."); } } else { console.error("Canvas element not found."); } calculateWeight(); // Trigger initial calculation };

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