Mild Steel Tube Weight Calculator & Guide
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Mild Steel Tube Weight Calculator
Calculation Results
—
Volume (cm³)
—
Steel Density (g/cm³)
—
Weight (kg)
—
Formula: The weight of a mild steel tube is calculated by finding its volume and multiplying it by the density of steel. For hollow tubes, we calculate the volume of the outer shape and subtract the volume of the inner hollow space.
Weight vs. Length Impact
Impact of tube length on total weight.
Common Mild Steel Tube Weights (per meter)
| Tube Type |
OD/Width (mm) |
Height (mm) |
Wall (mm) |
Weight (kg/m) |
What is Mild Steel Tube Weight Calculation?
The mild steel tube weight calculator is an essential tool for engineers, fabricators, construction professionals, and anyone working with steel tubing. It provides an accurate estimation of the mass of a given length of steel tube based on its dimensions and material properties. Mild steel, also known as carbon steel, is a widely used material due to its affordability, strength, and workability. Understanding the weight of these tubes is crucial for material procurement, structural design, transportation logistics, and ensuring safety in various applications.
Who should use it?
- Fabricators & Manufacturers: To estimate raw material needs, cost of goods, and shipping weights.
- Structural Engineers: To determine load-bearing capacities and ensure designs meet safety standards.
- Procurement Specialists: To accurately order steel tubes and manage inventory.
- Logistics & Transportation: To plan for shipping weight and capacity.
- DIY Enthusiasts: For projects involving steel tubing, to understand material handling and costs.
Common Misconceptions:
- Weight is uniform for all steel: While mild steel has a standard density, variations in alloy composition can slightly affect weight. However, for most practical purposes, a standard density is used.
- Thickness is the only factor: Tube weight is a function of its outer dimensions, wall thickness, and length. Ignoring any of these can lead to significant inaccuracies.
- Online calculators are always precise: While generally accurate, precision depends on the quality of input data and the calculator's underlying formula. Minor deviations might occur due to manufacturing tolerances.
Mild Steel Tube Weight Formula and Mathematical Explanation
The core principle behind calculating the weight of a mild steel tube involves determining the volume of the steel material used and multiplying it by the density of mild steel. The formula accounts for the hollow nature of the tube.
Derivation Steps:
- Calculate the volume of the solid outer shape.
- Calculate the volume of the hollow inner space.
- Subtract the inner volume from the outer volume to get the steel volume.
- Multiply the steel volume by the density of mild steel.
Mathematical Formula:
Weight = (Volume of Steel) × (Density of Steel)
Volume of Steel = (Volume of Outer Shape) – (Volume of Inner Hollow)
For a Round Tube:
Outer Volume = π × (Outer Diameter / 2)² × Length
Inner Diameter = Outer Diameter – (2 × Wall Thickness)
Inner Volume = π × (Inner Diameter / 2)² × Length
Steel Volume = Outer Volume – Inner Volume
Weight = [π × ((OD/2)² – ((OD – 2*WT)/2)²)] × Length × Density
For a Square or Rectangular Tube:
Outer Area = Width × Height
Outer Volume = Outer Area × Length
Inner Width = Width – (2 × Wall Thickness)
Inner Height = Height – (2 × Wall Thickness)
Inner Area = Inner Width × Inner Height
Inner Volume = Inner Area × Length
Steel Volume = Outer Volume – Inner Volume
Weight = [(Width × Height) – ((Width – 2*WT) × (Height – 2*WT))] × Length × Density
Variable Explanations:
| Variable |
Meaning |
Unit |
Typical Range/Value |
| OD |
Outer Diameter |
mm |
10 – 1000+ |
| Width |
Width of the tube's cross-section |
mm |
10 – 1000+ |
| Height |
Height of the tube's cross-section |
mm |
10 – 1000+ |
| WT |
Wall Thickness |
mm |
1 – 20+ |
| Length |
Total length of the tube |
mm |
100 – 12000+ |
| π (Pi) |
Mathematical constant |
Unitless |
3.14159 |
| Density of Mild Steel |
Mass per unit volume of mild steel |
g/cm³ |
~7.85 |
Note: Units are converted internally for calculation (e.g., mm to cm) to align with density units.
Practical Examples (Real-World Use Cases)
Example 1: Structural Frame Fabrication
A fabrication workshop is building a structural frame using round mild steel tubes. They need to estimate the total weight for lifting and handling.
- Tube Type: Round
- Outer Diameter (OD): 76.2 mm (3 inches)
- Wall Thickness (WT): 3.6 mm
- Length: 3000 mm (3 meters)
Calculation Steps (Simplified):
- Convert all dimensions to cm: OD = 7.62 cm, WT = 0.36 cm, Length = 30 cm.
- Outer Radius = 7.62 / 2 = 3.81 cm
- Inner Diameter = 7.62 – (2 * 0.36) = 6.9 cm
- Inner Radius = 6.9 / 2 = 3.45 cm
- Steel Volume = [π × (3.81² – 3.45²)] × 30 cm
- Steel Volume ≈ [3.14159 × (14.5161 – 11.9025)] × 30 cm
- Steel Volume ≈ [3.14159 × 2.6136] × 30 cm ≈ 8.2107 × 30 cm³ ≈ 246.32 cm³
- Weight = 246.32 cm³ × 7.85 g/cm³ ≈ 1933.6 g
- Weight ≈ 1.93 kg
Result Interpretation: Each 3-meter section of this 3-inch mild steel tube weighs approximately 1.93 kg. This information is vital for determining the total weight of the frame and planning the lifting equipment required.
Example 2: Rectangular Tubing for a Gate
A contractor is constructing a large, ornamental gate using rectangular steel tubing and needs to confirm the weight for transportation and installation.
- Tube Type: Rectangular
- Width: 100 mm
- Height: 50 mm
- Wall Thickness (WT): 4 mm
- Length: 2400 mm (2.4 meters)
Calculation Steps (Simplified):
- Convert to cm: Width = 10 cm, Height = 5 cm, WT = 0.4 cm, Length = 24 cm.
- Outer Area = 10 cm × 5 cm = 50 cm²
- Inner Width = 10 – (2 × 0.4) = 9.2 cm
- Inner Height = 5 – (2 × 0.4) = 4.2 cm
- Inner Area = 9.2 cm × 4.2 cm = 38.64 cm²
- Steel Volume = (50 cm² – 38.64 cm²) × 24 cm
- Steel Volume = 11.36 cm² × 24 cm = 272.64 cm³
- Weight = 272.64 cm³ × 7.85 g/cm³ ≈ 2140.2 g
- Weight ≈ 2.14 kg
Result Interpretation: Each 2.4-meter length of this rectangular tube weighs about 2.14 kg. Knowing this allows the contractor to accurately estimate the total weight of the gate and coordinate transport logistics.
How to Use This Mild Steel Tube Weight Calculator
Using our mild steel tube weight calculator is straightforward. Follow these simple steps:
- Select Tube Type: Choose 'Round', 'Square', or 'Rectangular' from the dropdown menu.
- Enter Dimensions:
- For Round tubes, input the 'Outer Diameter (OD)'.
- For Square or Rectangular tubes, input both 'Width' and 'Height'. The calculator will dynamically show/hide these fields based on your selection.
- Enter the 'Wall Thickness' for all tube types.
- Enter the 'Length' of the tube section you wish to calculate.
Ensure all measurements are in millimeters (mm).
- View Results: As you input the values, the results will update automatically in real-time.
- Primary Result (Weight): The total weight of the tube section in kilograms (kg).
- Volume (cm³): The calculated volume of the steel material.
- Steel Density (g/cm³): The assumed density of mild steel used in the calculation.
- Understand the Formula: A brief explanation of the calculation is provided below the results.
- Analyze Charts & Tables: Explore the visualisations to understand how length impacts weight and compare common tube sizes.
- Reset or Copy: Use the 'Reset' button to clear the fields and start over. Use the 'Copy Results' button to copy the key figures to your clipboard.
Decision-Making Guidance: The calculated weight helps in making informed decisions regarding material purchasing (avoiding over/under-ordering), structural integrity assessments, transportation planning, and cost estimations. For example, if the calculated weight exceeds the capacity of available lifting equipment, you may need to re-evaluate the design or source shorter lengths.
Key Factors That Affect Mild Steel Tube Weight Results
While the calculator provides a precise result based on input dimensions, several real-world factors can influence the actual weight of mild steel tubes:
- Manufacturing Tolerances: Steel tubes are manufactured within specific tolerance limits for dimensions (diameter, width, height, wall thickness). Slight variations from the nominal size can lead to minor discrepancies in weight. Our calculator uses the exact input values, assuming no deviation.
- Steel Grade and Composition: Although we use a standard density for mild steel (~7.85 g/cm³), different grades of steel might have slightly different densities due to variations in carbon content and other alloying elements. This calculator assumes a consistent density.
- Surface Coatings/Finishes: If the tube is coated with paint, galvanization, or other materials, this will add a small amount of weight not accounted for in this calculator. This tool calculates the weight of the steel itself.
- Tube Length Variations: Similar to dimensional tolerances, the actual length of a supplied tube might vary slightly from the ordered length. This can impact the total weight, especially for long runs.
- Internal Condition: While unlikely for standard tubes, significant internal scale, rust, or debris could theoretically add negligible weight. This calculator assumes a clean internal profile.
- Temperature Effects: Steel expands when heated and contracts when cooled. While this effect is usually minimal at ambient temperatures, extreme temperature variations could theoretically alter dimensions slightly, affecting precise weight calculations. For most practical applications, this is negligible.
Frequently Asked Questions (FAQ)
Q1: What is the standard density of mild steel used in calculations?
A: The commonly accepted density for mild steel is approximately 7.85 grams per cubic centimeter (g/cm³), which is equivalent to 7850 kilograms per cubic meter (kg/m³).
Q2: Does the calculator account for different steel alloys?
A: This calculator uses a standard density for mild steel. While different steel alloys can have slightly varying densities, 7.85 g/cm³ is a widely accepted average for mild steel used in structural applications. For highly specialized alloys, a specific density might be required.
Q3: Can I calculate the weight for a tube with non-uniform wall thickness?
A: No, this calculator assumes a uniform wall thickness around the entire cross-section. For tubes with significant variations, a more complex calculation or averaging method would be needed.
Q4: How accurate is the mild steel tube weight calculation?
A: The calculator is highly accurate based on the provided dimensions and the standard density of steel. Real-world accuracy depends on manufacturing tolerances and the exact steel composition.
Q5: What units does the calculator use for input and output?
A: Inputs for dimensions (diameter, width, height, wall thickness, length) should be in millimeters (mm). The output weight is provided in kilograms (kg).
Q6: Can I calculate the weight of a solid steel bar using this?
A: This calculator is designed for hollow tubes. For solid bars, you would effectively set the inner diameter or subtract zero wall thickness, but a dedicated solid bar calculator would be simpler.
Q7: What does the chart show?
A: The chart dynamically illustrates how increasing the length of a tube affects its total weight, assuming constant cross-sectional dimensions.
Q8: Is the steel density value adjustable?
A: This version uses a fixed value for mild steel density (7.85 g/cm³) for simplicity and common use cases. Advanced versions might include an option to input a custom density.
Related Tools and Internal Resources
var steelDensity = 7.85; // g/cm³
function updateTubeDimensionInputs() {
var tubeType = document.getElementById("tubeType").value;
var diameterGroup = document.getElementById("diameterGroup");
var widthGroup = document.getElementById("widthGroup");
var heightGroup = document.getElementById("heightGroup");
if (tubeType === "round") {
diameterGroup.style.display = "block";
widthGroup.style.display = "none";
heightGroup.style.display = "none";
} else if (tubeType === "square") {
diameterGroup.style.display = "none";
widthGroup.style.display = "block";
heightGroup.style.display = "block";
document.getElementById("height").value = document.getElementById("width").value; // Make square by default
} else { // rectangular
diameterGroup.style.display = "none";
widthGroup.style.display = "block";
heightGroup.style.display = "block";
}
}
function isValidNumber(value) {
return !isNaN(parseFloat(value)) && isFinite(value);
}
function updateCalculator() {
// — Input Validation —
var errors = {
diameter: ",
width: ",
height: ",
wallThickness: ",
length: "
};
var tubeType = document.getElementById("tubeType").value;
var diameter = document.getElementById("diameter").value;
var width = document.getElementById("width").value;
var height = document.getElementById("height").value;
var wallThickness = document.getElementById("wallThickness").value;
var length = document.getElementById("length").value;
if (tubeType === "round") {
if (!isValidNumber(diameter) || parseFloat(diameter) <= 0) {
errors.diameter = "Please enter a valid positive number for Outer Diameter.";
}
} else { // square or rectangular
if (!isValidNumber(width) || parseFloat(width) <= 0) {
errors.width = "Please enter a valid positive number for Width.";
}
if (!isValidNumber(height) || parseFloat(height) <= 0) {
errors.height = "Please enter a valid positive number for Height.";
}
if (tubeType === "square" && isValidNumber(width) && isValidNumber(height) && parseFloat(width) !== parseFloat(height)) {
// Suggest correction for square
document.getElementById("height").value = document.getElementById("width").value;
height = document.getElementById("height").value; // Update local variable
}
}
if (!isValidNumber(wallThickness) || parseFloat(wallThickness) <= 0) {
errors.wallThickness = "Please enter a valid positive number for Wall Thickness.";
}
if (!isValidNumber(length) || parseFloat(length) <= 0) {
errors.length = "Please enter a valid positive number for Length.";
}
document.getElementById("diameterError").textContent = errors.diameter;
document.getElementById("widthError").textContent = errors.width;
document.getElementById("heightError").textContent = errors.height;
document.getElementById("wallThicknessError").textContent = errors.wallThickness;
document.getElementById("lengthError").textContent = errors.length;
// — Calculation Logic —
var isValid = true;
var od = 0, w = 0, h = 0, wt = 0, l = 0;
var innerDiameter = 0, innerWidth = 0, innerHeight = 0;
var outerArea = 0, innerArea = 0, steelVolumeCm3 = 0;
var weightKg = 0;
var volumeCm3 = 0;
if (tubeType === "round") {
od = parseFloat(diameter);
wt = parseFloat(wallThickness);
l = parseFloat(length);
if (!errors.diameter && !errors.wallThickness && !errors.length) {
innerDiameter = od – (2 * wt);
if (innerDiameter <= 0) {
errors.wallThickness = "Wall thickness is too large for the given diameter.";
isValid = false;
} else {
var outerRadius = od / 2;
var innerRadius = innerDiameter / 2;
// Convert mm to cm for volume calculation to match density unit
var outerRadiusCm = outerRadius / 10;
var innerRadiusCm = innerRadius / 10;
var lengthCm = l / 10;
var outerVolumeCm3 = Math.PI * Math.pow(outerRadiusCm, 2) * lengthCm;
var innerVolumeCm3 = Math.PI * Math.pow(innerRadiusCm, 2) * lengthCm;
steelVolumeCm3 = outerVolumeCm3 – innerVolumeCm3;
volumeCm3 = steelVolumeCm3; // Use this for display
weightKg = steelVolumeCm3 * steelDensity / 1000; // Convert g to kg
}
} else {
isValid = false;
}
} else { // square or rectangular
w = parseFloat(width);
h = parseFloat(height);
wt = parseFloat(wallThickness);
l = parseFloat(length);
if (!errors.width && !errors.height && !errors.wallThickness && !errors.length) {
innerWidth = w – (2 * wt);
innerHeight = h – (2 * wt);
if (innerWidth <= 0 || innerHeight e === ")) {
document.getElementById("primaryResult").textContent = weightKg.toFixed(3) + " kg";
document.getElementById("volumeResult").textContent = volumeCm3.toFixed(2) + " cm³";
document.getElementById("densityResult").textContent = steelDensity.toFixed(2) + " g/cm³";
document.getElementById("weightResult").textContent = weightKg.toFixed(3) + " kg";
populateChartAndTable(weightKg);
} else {
document.getElementById("primaryResult").textContent = "Invalid Input";
document.getElementById("volumeResult").textContent = "–";
document.getElementById("densityResult").textContent = "–";
document.getElementById("weightResult").textContent = "–";
clearChart();
}
}
function resetCalculator() {
document.getElementById("tubeType").value = "round";
document.getElementById("diameter").value = "50";
document.getElementById("width").value = "50";
document.getElementById("height").value = "50";
document.getElementById("wallThickness").value = "3";
document.getElementById("length").value = "1000"; // Reset to 1 meter
// Clear errors
document.getElementById("diameterError").textContent = ";
document.getElementById("widthError").textContent = ";
document.getElementById("heightError").textContent = ";
document.getElementById("wallThicknessError").textContent = ";
document.getElementById("lengthError").textContent = ";
updateTubeDimensionInputs();
updateCalculator();
}
function copyResults() {
var primaryResult = document.getElementById("primaryResult").textContent;
var volumeResult = document.getElementById("volumeResult").textContent;
var densityResult = document.getElementById("densityResult").textContent;
var weightResult = document.getElementById("weightResult").textContent;
if (primaryResult === "–" || primaryResult === "Invalid Input") {
alert("No valid results to copy.");
return;
}
var tubeType = document.getElementById("tubeType").value;
var diameter = document.getElementById("diameter").value;
var width = document.getElementById("width").value;
var height = document.getElementById("height").value;
var wallThickness = document.getElementById("wallThickness").value;
var length = document.getElementById("length").value;
var assumptions = "Assumptions:\n";
assumptions += "- Steel Density: " + densityResult + "\n";
var inputSummary = "Inputs:\n";
inputSummary += "- Tube Type: " + tubeType.charAt(0).toUpperCase() + tubeType.slice(1) + "\n";
if (tubeType === "round") {
inputSummary += "- Outer Diameter (OD): " + diameter + " mm\n";
} else {
inputSummary += "- Width: " + width + " mm\n";
inputSummary += "- Height: " + height + " mm\n";
}
inputSummary += "- Wall Thickness: " + wallThickness + " mm\n";
inputSummary += "- Length: " + length + " mm\n";
var resultText = "Mild Steel Tube Weight Calculation Results:\n\n";
resultText += primaryResult + " (Total Weight)\n\n";
resultText += "Details:\n";
resultText += "- Steel Volume: " + volumeResult + "\n";
resultText += "- Steel Density: " + densityResult + "\n";
resultText += "- Calculated Weight: " + weightResult + "\n\n";
resultText += inputSummary + "\n";
resultText += assumptions;
try {
navigator.clipboard.writeText(resultText).then(function() {
alert("Results copied to clipboard!");
}, function(err) {
console.error("Failed to copy: ", err);
alert("Failed to copy results. Please copy manually.");
});
} catch (e) {
console.error("Clipboard API not available: ", e);
alert("Clipboard API not available. Please copy manually.");
}
}
// — Charting —
var weightChart;
var chartContext;
function populateChartAndTable(currentWeightKg) {
var tubeType = document.getElementById("tubeType").value;
var diameter = parseFloat(document.getElementById("diameter").value);
var width = parseFloat(document.getElementById("width").value);
var height = parseFloat(document.getElementById("height").value);
var wallThickness = parseFloat(document.getElementById("wallThickness").value);
var length = parseFloat(document.getElementById("length").value);
var chartData = {
labels: [], // Lengths in meters
datasets: [{
label: 'Tube Weight (kg)',
data: [], // Weights in kg
borderColor: 'rgb(0, 74, 153)',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: true,
tension: 0.1
}]
};
var lengthsToChart = [0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5]; // in meters
if (length < 5000) { // If user entered length is less than 5m, scale dynamically
lengthsToChart = [];
for (var i = 0.5; i <= length / 1000; i += 0.5) {
lengthsToChart.push(i);
}
if(lengthsToChart.length === 0) lengthsToChart.push(length/1000);
}
// Populate Table Body
var tableBody = document.getElementById("weightTableBody");
tableBody.innerHTML = ''; // Clear existing rows
var commonSizes = [];
if (tubeType === "round") {
commonSizes = [
{ name: "Round", od: 25, wt: 2 }, { name: "Round", od: 32, wt: 2.5 }, { name: "Round", od: 42, wt: 3 },
{ name: "Round", od: 48.3, wt: 3.2 }, { name: "Round", od: 60.3, wt: 3.6 }, { name: "Round", od: 76.1, wt: 4 },
{ name: "Round", od: 88.9, wt: 4.5 }, { name: "Round", od: 114.3, wt: 5 }
];
} else if (tubeType === "square") {
commonSizes = [
{ name: "Square", dim: 25, wt: 2 }, { name: "Square", dim: 30, wt: 3 }, { name: "Square", dim: 40, wt: 3 },
{ name: "Square", dim: 50, wt: 3 }, { name: "Square", dim: 60, wt: 4 }, { name: "Square", dim: 75, wt: 4 },
{ name: "Square", dim: 100, wt: 5 }
];
} else { // rectangular
commonSizes = [
{ name: "Rectangular", w: 50, h: 25, wt: 2 }, { name: "Rectangular", w: 50, h: 30, wt: 3 },
{ name: "Rectangular", w: 60, h: 40, wt: 3 }, { name: "Rectangular", w: 75, h: 50, wt: 4 },
{ name: "Rectangular", w: 100, h: 50, wt: 4 }, { name: "Rectangular", w: 100, h: 100, wt: 5 },
{ name: "Rectangular", w: 150, h: 100, wt: 6 }
];
}
for (var i = 0; i < commonSizes.length; i++) {
var currentRow = tableBody.insertRow();
var cell1 = currentRow.insertCell(0);
var cell2 = currentRow.insertCell(1);
var cell3 = currentRow.insertCell(2);
var cell4 = currentRow.insertCell(3);
var cell5 = currentRow.insertCell(4);
var commonSize = commonSizes[i];
var calculatedWeightPerMeter = calculateWeightPerMeter(commonSize, tubeType);
cell1.textContent = commonSize.name;
cell2.textContent = commonSize.od || commonSize.dim || commonSize.w || "-";
cell3.textContent = commonSize.h || "-";
cell4.textContent = commonSize.wt || "-";
cell5.textContent = calculatedWeightPerMeter.toFixed(3) + " kg";
// Add to chart data if it matches current selection
if (commonSize.name === tubeType) {
if (tubeType === "round" && commonSize.od === diameter && commonSize.wt === wallThickness) {
// This is the currently selected tube, add its data points
chartData.labels.push(length / 1000 + "m");
chartData.datasets[0].data.push(currentWeightKg);
} else if (tubeType !== "round" && commonSize.w === width && commonSize.h === height && commonSize.wt === wallThickness) {
// This is the currently selected tube, add its data points
chartData.labels.push(length / 1000 + "m");
chartData.datasets[0].data.push(currentWeightKg);
}
}
}
// Ensure the current tube's data point is included if not already
var currentLengthMeter = length / 1000;
if (!chartData.labels.includes(currentLengthMeter + "m")) {
chartData.labels.push(currentLengthMeter + "m");
chartData.datasets[0].data.push(currentWeightKg);
}
// Sort chart data by length
var combined = [];
for (var j = 0; j < chartData.labels.length; j++) {
combined.push({ label: chartData.labels[j], data: chartData.datasets[0].data[j] });
}
combined.sort(function(a, b) {
return parseFloat(a.label.replace('m', '')) – parseFloat(b.label.replace('m', ''));
});
chartData.labels = combined.map(function(item) { return item.label; });
chartData.datasets[0].data = combined.map(function(item) { return item.data; });
// Initialize or update chart
if (weightChart) {
weightChart.data = chartData;
weightChart.update();
} else {
chartContext = document.getElementById('weightChart').getContext('2d');
weightChart = new Chart(chartContext, {
type: 'line',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: { display: true, text: 'Weight (kg)' }
},
x: {
title: { display: true, text: 'Length (m)' }
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y.toFixed(3) + ' kg';
}
return label;
}
}
}
}
}
});
}
}
function calculateWeightPerMeter(dims, type) {
var w = 0, h = 0, od = 0, wt = 0;
var lengthMeter = 1; // Calculate for 1 meter
if (type === "round") {
od = dims.od;
wt = dims.wt;
var innerDiameter = od – (2 * wt);
if (innerDiameter <= 0) return 0; // Invalid dimensions
var outerRadiusCm = (od / 2) / 10;
var innerRadiusCm = (innerDiameter / 2) / 10;
var lengthCm = lengthMeter * 100; // 1 meter = 100 cm
var outerVolumeCm3 = Math.PI * Math.pow(outerRadiusCm, 2) * lengthCm;
var innerVolumeCm3 = Math.PI * Math.pow(innerRadiusCm, 2) * lengthCm;
var steelVolumeCm3 = outerVolumeCm3 – innerVolumeCm3;
return (steelVolumeCm3 * steelDensity) / 1000; // in kg
} else { // square or rectangular
w = dims.dim || dims.w;
h = dims.dim || dims.h;
wt = dims.wt;
var innerWidth = w – (2 * wt);
var innerHeight = h – (2 * wt);
if (innerWidth <= 0 || innerHeight <= 0) return 0; // Invalid dimensions
var widthCm = w / 10;
var heightCm = h / 10;
var innerWidthCm = innerWidth / 10;
var innerHeightCm = innerHeight / 10;
var lengthCm = lengthMeter * 100; // 1 meter = 100 cm
var outerVolumeCm3 = widthCm * heightCm * lengthCm;
var innerVolumeCm3 = innerWidthCm * innerHeightCm * lengthCm;
var steelVolumeCm3 = outerVolumeCm3 – innerVolumeCm3;
return (steelVolumeCm3 * steelDensity) / 1000; // in kg
}
}
function clearChart() {
if (weightChart) {
weightChart.data.labels = [];
weightChart.data.datasets.forEach(function(dataset) {
dataset.data = [];
});
weightChart.update();
}
}
// Initial setup
document.addEventListener("DOMContentLoaded", function() {
updateTubeDimensionInputs();
resetCalculator(); // Set default values and calculate initial state
});