Enter the dimensions and material type to determine the weight of your aluminum component.
Solid Rectangular Bar
Solid Round Bar
Sheet
Tube
Angle
Select the shape of your aluminum.
cm
cm
cm
cm
cm
e.g., 100 cm
Results
Volume
—
Density
—
Assumed Alloy
—
Formula Used: Weight = Volume × Density
Volume is calculated based on the selected shape and dimensions.
What is Aluminum Weight Calculation?
Calculating the weight of aluminum is a fundamental process in engineering, manufacturing, and procurement. It involves determining the mass of a specific aluminum object based on its dimensions and the material's inherent density. This calculation is crucial for estimating material costs, planning structural loads, optimizing shipping weights, and ensuring that fabricated parts meet design specifications. Whether you're a designer specifying materials, a purchasing agent ordering stock, or a fabricator preparing a job, understanding how to calculate aluminum weight accurately is essential.
Who Should Use It:
Engineers, architects, machinists, welders, purchasing managers, procurement specialists, DIY enthusiasts, metal fabricators, and anyone involved in projects utilizing aluminum components will benefit from this calculation. It provides a clear understanding of the material's physical properties and associated costs.
Common Misconceptions:
A common misconception is that all aluminum is the same; however, different aluminum alloys have slightly different densities, which can affect the final weight. Another misconception is that simple geometric formulas always suffice, overlooking the need for precise measurements and the correct density value for the specific alloy. This calculator helps standardize the process and account for these variations.
Aluminum Weight Calculation Formula and Mathematical Explanation
The core principle behind calculating the weight of any material, including aluminum, is the relationship between volume, density, and mass (weight). The fundamental formula is:
Weight = Volume × Density
To use this formula effectively for aluminum, we need to:
Determine the Volume of the aluminum component based on its shape and dimensions.
Identify the correct Density of the specific aluminum alloy being used.
Volume Calculation by Shape
The calculation of volume depends heavily on the geometric shape of the aluminum part. Here are common shapes and their volume formulas:
Density is a measure of mass per unit volume. The density of aluminum varies slightly depending on the specific alloy and its temper (heat treatment). However, a commonly used standard value for many common aluminum alloys (like 6061) is approximately 2.70 grams per cubic centimeter (g/cm³). This calculator uses this standard value unless otherwise specified.
Weight Calculation Breakdown
Once the volume is calculated, multiply it by the density to get the weight in grams.
Weight (grams) = Volume (cm³) × 2.70 (g/cm³)
The result is typically converted to kilograms or pounds for practical use.
Variables Explained
Key Variables in Aluminum Weight Calculation
Variable
Meaning
Unit
Typical Range
Length (L)
The longest dimension of the aluminum piece.
cm
0.1 – 1000+
Width (W)
The second dimension for rectangular shapes.
cm
0.1 – 500+
Thickness (T)
The third dimension for rectangular shapes or sheet thickness.
cm
0.01 – 50+
Diameter (D)
The diameter of a round bar or the outer diameter of a tube.
cm
0.1 – 100+
Wall Thickness (WT)
The thickness of the material in a hollow shape (like a tube).
cm
0.01 – 20+
Volume (V)
The amount of space occupied by the aluminum.
cm³
Calculated
Density (ρ)
Mass per unit volume of aluminum.
g/cm³
~2.6 – 2.8 (standard ~2.70)
Weight (W)
The final mass of the aluminum component.
grams, kg, lbs
Calculated
Practical Examples (Real-World Use Cases)
Example 1: Calculating the Weight of an Aluminum Sheet
A manufacturer needs to order a sheet of aluminum for a custom enclosure.
Shape: Sheet
Length (L): 120 cm
Width (W): 60 cm
Thickness (T): 0.5 cm
Assumed Alloy Density: 2.70 g/cm³
Calculation:
Volume Calculation: V = L × W × T = 120 cm × 60 cm × 0.5 cm = 3600 cm³
Conversion to Kilograms: 9720 g / 1000 g/kg = 9.72 kg
Interpretation: The 120cm x 60cm x 0.5cm aluminum sheet weighs approximately 9.72 kg. This information is vital for quoting the material cost and planning for handling and transportation.
Example 2: Calculating the Weight of a Solid Aluminum Round Bar
An engineer needs to determine the weight of a solid aluminum rod used as a structural component.
Shape: Solid Round Bar
Diameter (D): 5 cm
Length (L): 200 cm
Assumed Alloy Density: 2.70 g/cm³
Calculation:
Radius (r): D / 2 = 5 cm / 2 = 2.5 cm
Volume Calculation: V = π × r² × L = π × (2.5 cm)² × 200 cm ≈ 3.14159 × 6.25 cm² × 200 cm ≈ 3927 cm³
Conversion to Kilograms: 10603 g / 1000 g/kg ≈ 10.60 kg
Interpretation: The 5cm diameter, 200cm long solid aluminum rod weighs approximately 10.60 kg. This helps in determining if the component is too heavy for its intended application or for calculating shipping expenses.
How to Use This Aluminum Weight Calculator
Our Aluminum Weight Calculator is designed for simplicity and accuracy. Follow these steps to get your weight calculation instantly.
Select Aluminum Shape: Choose the correct shape of your aluminum component from the dropdown menu (e.g., Solid Rectangular Bar, Sheet, Tube).
Enter Dimensions: Input the required dimensions based on the selected shape. The calculator will prompt you for Length, Width, Thickness, Diameter, or Wall Thickness as appropriate. Ensure your units are consistent (e.g., all in centimeters).
Specify Overall Length: Enter the total length of the aluminum piece.
Calculate: Click the "Calculate Weight" button.
How to Read Results:
The calculator will display:
Primary Result (Weight): The total estimated weight of your aluminum component, shown prominently in kilograms.
Volume: The calculated volume in cubic centimeters (cm³).
Density: The assumed density used in the calculation (typically 2.70 g/cm³ for common alloys).
Assumed Alloy: Indicates the standard alloy density used.
Decision-Making Guidance: Use the calculated weight to:
Estimate material costs.
Verify structural integrity and load-bearing capacity.
Plan for shipping and logistics.
Compare different material options.
The "Copy Results" button allows you to easily transfer the key figures for documentation or sharing. Use the "Reset" button to clear the fields and start a new calculation.
Key Factors That Affect Aluminum Weight Results
While the core formula (Weight = Volume × Density) is straightforward, several factors can influence the accuracy and final result of your aluminum weight calculation:
Specific Aluminum Alloy: The most significant factor after volume is the density, which varies slightly between different aluminum alloys (e.g., 1xxx series vs. 6xxx series vs. 7xxx series). Common alloys like 6061 have a density around 2.70 g/cm³, but others might range from 2.6 to 2.8 g/cm³. Always try to use the density specific to your alloy for precise calculations.
Dimensional Accuracy: The precision of your measurements is paramount. Small errors in length, width, thickness, or diameter can lead to noticeable discrepancies in the calculated volume and, subsequently, the weight, especially for large components. Ensure measurements are taken carefully using calibrated tools.
Units Consistency: Inconsistent units (e.g., mixing centimeters and millimeters without conversion) will lead to drastically incorrect volume and weight calculations. This calculator assumes dimensions are entered in centimeters (cm), and the density is in grams per cubic centimeter (g/cm³). Always double-check your input units.
Hollow vs. Solid Parts: For hollow shapes like tubes, accurately measuring both the outer diameter and wall thickness (or inner diameter) is critical. An incorrect wall thickness will significantly alter the calculated volume and weight.
Tolerances and Manufacturing Variations: Real-world aluminum products often have manufacturing tolerances. A "10 cm" bar might actually be 10.05 cm or 9.98 cm. For critical applications, consider these tolerances when calculating maximum or minimum expected weights.
Surface Treatments/Coatings: While usually negligible for weight calculations, thick coatings (like anodizing or powder coating) add a small amount of mass. For most bulk calculations, this is ignored, but for highly precise applications, it might be a minor consideration.
Temperature Effects: Density changes slightly with temperature due to thermal expansion. However, for typical ambient temperature calculations in engineering and procurement, this effect is negligible and generally not factored into standard weight calculations.
Frequently Asked Questions (FAQ)
What is the standard density of aluminum?
The standard density commonly used for many aluminum alloys (like 6061) is approximately 2.70 grams per cubic centimeter (g/cm³). This is equivalent to about 168.5 pounds per cubic foot (lb/ft³).
How do I calculate the weight of a complex aluminum shape?
For complex or irregular shapes, you can approximate the volume by breaking the shape down into simpler geometric components (rectangles, cylinders, etc.), calculating the volume of each, summing them up, and then multiplying by the density. Alternatively, advanced CAD software can often calculate the volume and weight directly from the 3D model.
Does the type of aluminum alloy matter for weight calculation?
Yes, slightly. While the standard density is around 2.70 g/cm³, different alloys can have densities ranging from approximately 2.6 g/cm³ to 2.8 g/cm³. For highly precise weight calculations, it's best to find the specific density for the alloy you are using. Our calculator uses a standard value for general estimations.
What units should I use for dimensions?
This calculator is designed to work with dimensions entered in centimeters (cm). The resulting volume will be in cubic centimeters (cm³), and the weight will be calculated in grams, then converted to kilograms (kg). Ensure all your dimension inputs are in the same unit (cm) for accurate results.
How accurate is this calculator?
The calculator's accuracy depends on the correctness of your input dimensions and the accuracy of the assumed density (2.70 g/cm³). If your specific aluminum alloy has a different density or if your measurements have significant tolerances, the calculated weight will be an estimate.
Can I calculate the weight of aluminum scrap?
For scrap, it's more challenging as the shape is irregular. You would need to estimate the total volume of the scrap pile or container and multiply by the density. Often, scrap metal is sold by weight directly, bypassing volumetric calculations.
What is the difference between weight and mass?
Technically, weight is a force (mass × gravity), while mass is the amount of matter. In common usage, "weight" often refers to mass. This calculator computes mass, typically expressed in kilograms or pounds.
How does aluminum's weight compare to steel?
Aluminum is significantly lighter than steel. On average, aluminum has a density of about 2.70 g/cm³, while steel's density is around 7.85 g/cm³. This means aluminum is roughly one-third the weight of steel for the same volume, making it ideal for applications where weight reduction is critical.
Calculate the surface area of various geometric shapes for finishing or coating estimations.
var standardDensity = 2.70; // g/cm³ for common aluminum alloys
var densityUnit = "g/cm³";
var primaryResultElement = document.getElementById("primary-result");
var volumeResultElement = document.getElementById("volumeResult");
var densityResultElement = document.getElementById("densityResult");
var alloyResultElement = document.getElementById("alloyResult");
var resultSection = document.getElementById("result-section");
var inputs = [
document.getElementById("dimension1"),
document.getElementById("dimension2"),
document.getElementById("dimension3"),
document.getElementById("diameter"),
document.getElementById("wallThickness"),
document.getElementById("length")
];
var shapeSelect = document.getElementById("shape");
var dim1Group = document.getElementById("dim1-group");
var dim2Group = document.getElementById("dim2-group");
var dim3Group = document.getElementById("dim3-group");
var diameterGroup = document.getElementById("diameter-group");
var wallThicknessGroup = document.getElementById("wall-thickness-group");
function updateUnits() {
var selectedShape = shapeSelect.value;
var dim1Label = dim1Group.querySelector('label');
var dim2Label = dim2Group.querySelector('label');
var dim3Label = dim3Group.querySelector('label');
var dim1UnitSpan = document.getElementById("dim1-unit");
var dim2UnitSpan = document.getElementById("dim2-unit");
var dim3UnitSpan = document.getElementById("dim3-unit");
var diameterUnitSpan = document.getElementById("diameter-unit");
var wallThicknessUnitSpan = document.getElementById("wallThickness-unit");
var lengthInput = document.getElementById("length");
var lengthUnitSpan = lengthInput.nextElementSibling;
dim1Group.style.display = 'block';
dim2Group.style.display = 'block';
dim3Group.style.display = 'block';
diameterGroup.style.display = 'none';
wallThicknessGroup.style.display = 'none';
if (selectedShape === "solid_rectangular_bar") {
dim1Label.textContent = "Length (L)";
dim1UnitSpan.textContent = "cm";
dim2Label.textContent = "Width (W)";
dim2UnitSpan.textContent = "cm";
dim3Label.textContent = "Thickness (T)";
dim3UnitSpan.textContent = "cm";
lengthInput.previousElementSibling.textContent = "Overall Length";
lengthUnitSpan.textContent = "cm";
} else if (selectedShape === "solid_round_bar") {
dim1Label.textContent = "Diameter (D)";
dim1UnitSpan.textContent = "cm";
dim2Group.style.display = 'none';
dim3Group.style.display = 'none';
diameterGroup.style.display = 'block';
diameterUnitSpan.textContent = "cm";
lengthInput.previousElementSibling.textContent = "Length (L)";
lengthUnitSpan.textContent = "cm";
} else if (selectedShape === "sheet") {
dim1Label.textContent = "Length (L)";
dim1UnitSpan.textContent = "cm";
dim2Label.textContent = "Width (W)";
dim2UnitSpan.textContent = "cm";
dim3Label.textContent = "Thickness (T)";
dim3UnitSpan.textContent = "cm";
lengthInput.previousElementSibling.textContent = "Sheet Length";
lengthUnitSpan.textContent = "cm";
} else if (selectedShape === "tube") {
dim1Label.textContent = "Outer Diameter (OD)";
dim1UnitSpan.textContent = "cm";
dim2Label.textContent = "Wall Thickness (WT)";
dim2UnitSpan.textContent = "cm";
dim3Group.style.display = 'none';
diameterGroup.style.display = 'block';
diameterUnitSpan.textContent = "cm";
wallThicknessGroup.style.display = 'block';
wallThicknessUnitSpan.textContent = "cm";
lengthInput.previousElementSibling.textContent = "Tube Length";
lengthUnitSpan.textContent = "cm";
} else if (selectedShape === "angle") {
dim1Label.textContent = "Leg 1 Length (L1)";
dim1UnitSpan.textContent = "cm";
dim2Label.textContent = "Leg 2 Length (L2)";
dim2UnitSpan.textContent = "cm";
dim3Label.textContent = "Thickness (T)";
dim3UnitSpan.textContent = "cm";
lengthInput.previousElementSibling.textContent = "Angle Length";
lengthUnitSpan.textContent = "cm";
}
// Clear previous results and errors when shape changes
clearResultsAndErrors();
}
function clearResultsAndErrors() {
primaryResultElement.textContent = "–";
volumeResultElement.textContent = "–";
densityResultElement.textContent = "–";
alloyResultElement.textContent = "–";
resultSection.style.display = "none";
var errorMessages = document.querySelectorAll(".error-message");
for (var i = 0; i < errorMessages.length; i++) {
errorMessages[i].style.display = "none";
errorMessages[i].textContent = "";
}
// Clear input field borders
for (var i = 0; i < inputs.length; i++) {
inputs[i].style.borderColor = "#ced4da";
}
document.getElementById("dimension1").style.borderColor = "#ced4da";
document.getElementById("dimension2").style.borderColor = "#ced4da";
document.getElementById("dimension3").style.borderColor = "#ced4da";
document.getElementById("diameter").style.borderColor = "#ced4da";
document.getElementById("wallThickness").style.borderColor = "#ced4da";
document.getElementById("length").style.borderColor = "#ced4da";
}
function validateInput(element, min, max) {
var value = parseFloat(element.value);
var errorElement = document.getElementById(element.id + "-error");
var isValid = true;
if (isNaN(value) || element.value.trim() === "") {
errorElement.textContent = "Please enter a valid number.";
errorElement.style.display = "block";
element.style.borderColor = "#dc3545";
isValid = false;
} else if (value <= 0) {
errorElement.textContent = "Value must be positive.";
errorElement.style.display = "block";
element.style.borderColor = "#dc3545";
isValid = false;
} else if (min !== undefined && value max) {
errorElement.textContent = "Value cannot be greater than " + max + ".";
errorElement.style.display = "block";
element.style.borderColor = "#dc3545";
isValid = false;
} else {
errorElement.textContent = "";
errorElement.style.display = "none";
element.style.borderColor = "#ced4da"; // Default border color
}
return isValid;
}
function calculateVolume() {
var selectedShape = shapeSelect.value;
var dim1 = parseFloat(document.getElementById("dimension1").value);
var dim2 = parseFloat(document.getElementById("dimension2").value);
var dim3 = parseFloat(document.getElementById("dimension3").value);
var diameter = parseFloat(document.getElementById("diameter").value);
var wallThickness = parseFloat(document.getElementById("wallThickness").value);
var length = parseFloat(document.getElementById("length").value);
var volume = 0;
if (selectedShape === "solid_rectangular_bar" || selectedShape === "sheet") {
volume = dim1 * dim2 * dim3;
} else if (selectedShape === "solid_round_bar") {
var radius = dim1 / 2;
volume = Math.PI * radius * radius * length;
} else if (selectedShape === "tube") {
var outerRadius = diameter / 2;
var innerRadius = outerRadius – wallThickness;
if (innerRadius <= 0) return -1; // Invalid tube dimensions
volume = Math.PI * (outerRadius * outerRadius – innerRadius * innerRadius) * length;
} else if (selectedShape === "angle") {
// For angle, we assume a standard equal leg angle for simplicity in this calculator
// Volume = Area * Length
// Area of Angle = (Leg1 * Thickness) + (Leg2 – Thickness) * Thickness
var leg1 = dim1;
var leg2 = dim2;
var thickness = dim3;
var area = (leg1 * thickness) + ((leg2 – thickness) * thickness);
volume = area * length;
}
return volume;
}
function calculateWeight() {
clearResultsAndErrors(); // Clear previous errors before re-validating
var isValid = true;
var shape = shapeSelect.value;
// Validate dimensions based on shape
if (shape === "solid_rectangular_bar" || shape === "sheet") {
isValid = validateInput(document.getElementById("dimension1"), 0.01) && isValid; // L
isValid = validateInput(document.getElementById("dimension2"), 0.01) && isValid; // W
isValid = validateInput(document.getElementById("dimension3"), 0.01) && isValid; // T
} else if (shape === "solid_round_bar") {
isValid = validateInput(document.getElementById("dimension1"), 0.01) && isValid; // D
// Dimension 2 and 3 are hidden and not validated here
} else if (shape === "tube") {
isValid = validateInput(document.getElementById("dimension1"), 0.01) && isValid; // OD
isValid = validateInput(document.getElementById("dimension2"), 0.01) && isValid; // WT
// Dimension 3 is hidden
} else if (shape === "angle") {
isValid = validateInput(document.getElementById("dimension1"), 0.01) && isValid; // Leg 1
isValid = validateInput(document.getElementById("dimension2"), 0.01) && isValid; // Leg 2
isValid = validateInput(document.getElementById("dimension3"), 0.01) && isValid; // Thickness
}
isValid = validateInput(document.getElementById("length"), 0.01) && isValid; // Overall Length
if (!isValid) {
return; // Stop calculation if any validation fails
}
var volume = calculateVolume();
if (volume === -1) { // Special case for invalid tube dimensions
var errorElement = document.getElementById("dimension2-error"); // Error for Wall Thickness
errorElement.textContent = "Wall thickness cannot be greater than or equal to the outer radius.";
errorElement.style.display = "block";
document.getElementById("dimension2").style.borderColor = "#dc3545";
return;
}
var weightGrams = volume * standardDensity;
var weightKg = weightGrams / 1000;
primaryResultElement.textContent = weightKg.toFixed(3) + " kg";
volumeResultElement.textContent = volume.toFixed(2) + " cm³";
densityResultElement.textContent = standardDensity.toFixed(2) + " " + densityUnit;
alloyResultElement.textContent = "Standard (approx. 2.70 g/cm³)";
resultSection.style.display = "block";
updateChart(volume, weightKg);
}
function resetCalculator() {
shapeSelect.value = "solid_rectangular_bar";
document.getElementById("dimension1").value = "";
document.getElementById("dimension2").value = "";
document.getElementById("dimension3").value = "";
document.getElementById("diameter").value = "";
document.getElementById("wallThickness").value = "";
document.getElementById("length").value = "";
updateUnits(); // Reset labels and visibility
clearResultsAndErrors();
resetChart();
}
function copyResults() {
var resultText = "— Aluminum Weight Calculation Results —\n\n";
resultText += "Shape: " + shapeSelect.options[shapeSelect.selectedIndex].text + "\n";
var shape = shapeSelect.value;
if (shape === "solid_rectangular_bar" || shape === "sheet") {
resultText += "Length (L): " + document.getElementById("dimension1").value + " cm\n";
resultText += "Width (W): " + document.getElementById("dimension2").value + " cm\n";
resultText += "Thickness (T): " + document.getElementById("dimension3").value + " cm\n";
} else if (shape === "solid_round_bar") {
resultText += "Diameter (D): " + document.getElementById("dimension1").value + " cm\n";
resultText += "Length (L): " + document.getElementById("length").value + " cm\n";
} else if (shape === "tube") {
resultText += "Outer Diameter (OD): " + document.getElementById("dimension1").value + " cm\n";
resultText += "Wall Thickness (WT): " + document.getElementById("dimension2").value + " cm\n";
resultText += "Length (L): " + document.getElementById("length").value + " cm\n";
} else if (shape === "angle") {
resultText += "Leg 1 (L1): " + document.getElementById("dimension1").value + " cm\n";
resultText += "Leg 2 (L2): " + document.getElementById("dimension2").value + " cm\n";
resultText += "Thickness (T): " + document.getElementById("dimension3").value + " cm\n";
resultText += "Length: " + document.getElementById("length").value + " cm\n";
}
resultText += "\n— Calculated Values —\n";
resultText += "Weight: " + primaryResultElement.textContent + "\n";
resultText += "Volume: " + volumeResultElement.textContent + "\n";
resultText += "Density Used: " + densityResultElement.textContent + "\n";
resultText += "Assumed Alloy: " + alloyResultElement.textContent + "\n";
resultText += "\n— Key Assumptions —\n";
resultText += "Standard Aluminum Density: " + standardDensity + " g/cm³\n";
resultText += "Dimensions entered in centimeters (cm).\n";
try {
var textArea = document.createElement("textarea");
textArea.value = resultText;
document.body.appendChild(textArea);
textArea.select();
document.execCommand("copy");
document.body.removeChild(textArea);
alert("Results copied to clipboard!");
} catch (err) {
alert("Failed to copy results. Please copy manually.");
}
}
// Chart related variables
var ctx;
var myChart;
var chartData = {
labels: ['Volume', 'Weight'],
datasets: [{
label: 'Calculated Values',
data: [0, 0],
backgroundColor: [
'rgba(0, 74, 153, 0.6)', // Primary color for Volume
'rgba(40, 167, 69, 0.6)' // Success color for Weight
],
borderColor: [
'rgba(0, 74, 153, 1)',
'rgba(40, 167, 69, 1)'
],
borderWidth: 1
}]
};
function setupChart() {
var chartCanvas = document.getElementById('weightChart');
if (!chartCanvas) return; // Canvas not found
ctx = chartCanvas.getContext('2d');
myChart = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
plugins: {
title: {
display: true,
text: 'Volume vs. Calculated Weight',
font: {
size: 16
}
},
legend: {
position: 'bottom',
}
},
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Value'
}
},
x: {
title: {
display: true,
text: 'Metric'
}
}
}
}
});
}
function updateChart(volume, weightKg) {
if (!myChart) {
setupChart(); // Ensure chart is set up
}
if (myChart && ctx) {
// Ensure the x-axis labels are correctly set
chartData.labels = ['Volume (' + volume.toFixed(2) + ' cm³)', 'Weight (' + weightKg.toFixed(3) + ' kg)'];
myChart.data.datasets[0].data[0] = volume;
myChart.data.datasets[0].data[1] = weightKg * 1000; // Convert kg to grams for comparison if density is g/cm³
// Or keep weight in kg and adjust y-axis scale if needed. Let's stick to kg for weight value.
// myChart.data.datasets[0].data[1] = weightKg; // Assuming y-axis can handle different scales or is contextually understood. For bars, it's better if comparable units or clearly labelled.
// For better visual comparison, let's scale weight to match volume units conceptually, or use kg directly for weight.
// Let's use kg for weight for clarity, and cm³ for volume. The scale will adjust.
myChart.data.datasets[0].data[0] = volume; // Volume in cm³
myChart.data.datasets[0].data[1] = weightKg; // Weight in kg
myChart.data.labels = ['Volume', 'Weight']; // Reset labels for clarity
// Update y-axis title to reflect the primary unit (kg for weight)
myChart.options.scales.y.title.text = 'Value (cm³ for Volume, kg for Weight)';
myChart.update();
}
}
function resetChart() {
if (myChart) {
chartData.datasets[0].data = [0, 0];
myChart.update();
}
}
function toggleFaq(element) {
var content = element.nextElementSibling;
if (content.style.display === "block") {
content.style.display = "none";
} else {
content.style.display = "block";
}
}
// Initial setup
document.addEventListener("DOMContentLoaded", function() {
updateUnits(); // Set initial labels and visibility
// setupChart(); // Setup chart on load
// Add event listeners for real-time validation
inputs.forEach(function(input) {
input.addEventListener('input', function() {
// Basic check for positive number on input change
var value = parseFloat(this.value);
var errorElement = document.getElementById(this.id + "-error");
if (isNaN(value) || value <= 0) {
if (this.value.trim() !== "") { // Only show error if not empty but invalid
errorElement.textContent = "Value must be positive.";
errorElement.style.display = "block";
this.style.borderColor = "#dc3545";
} else {
errorElement.style.display = "none";
this.style.borderColor = "#ced4da";
}
} else {
errorElement.style.display = "none";
this.style.borderColor = "#ced4da";
}
});
});
});
// Re-initialize chart setup and update logic after the canvas element is guaranteed to be in the DOM
document.addEventListener("DOMContentLoaded", function() {
setupChart();
// Trigger an initial calculation if fields have default values or are meant to be pre-filled
// For this calculator, we'll var the user trigger the first calculation.
});