Metal Weight Calculator
Accurate Calculations for Metal Density and Weight
Select Metal
Steel
Aluminum
Copper
Brass
Iron
Lead
Gold
Silver
Choose the type of metal.
Select Shape
Rectangular Prism (Bar, Plate)
Cylinder (Rod, Pipe)
Sphere
Select the geometric shape of the metal piece.
Metric (kg, cm)
Imperial (lbs, inches)
Select the units for your dimensions and result.
Calculation Results
—
Volume: —
Density: —
Dimensions: —
Formula Used: Weight = Volume × Density. Volume is calculated based on the selected shape and dimensions.
| Metric | Value | Unit |
|---|---|---|
| Selected Metal | — | N/A |
| Selected Shape | — | N/A |
| Base Dimensions | — | |
| Calculated Volume | — | |
| Metal Density | — | |
| Calculated Weight | — |
Volume
Weight
Metal Weight Calculator: Precision Engineering and Material Estimation
{primary_keyword} is an essential tool for engineers, manufacturers, hobbyists, and procurement specialists who need to accurately estimate the mass of metallic components. Whether you are calculating the material required for a new project, verifying supplier invoices, or designing for weight constraints, a reliable metal weight calculator download and online tool is indispensable. This calculator simplifies complex geometric and material density calculations, providing immediate, actionable data. Understanding the weight of metal is critical for cost estimation, structural integrity, transportation logistics, and quality control in countless industries, from aerospace and automotive to jewelry and construction.
What is a Metal Weight Calculator?
A {primary_keyword} is a digital utility designed to compute the weight (or mass) of a given piece of metal based on its material type, dimensions, and shape. It leverages known physical properties of metals, primarily their density, and applies geometric formulas to determine volume, ultimately calculating the total weight. Many users search for a "metal weight calculator download" to integrate this functionality into their offline workflows or project management software, ensuring data privacy and accessibility without an internet connection.
Who Should Use It:
- Engineers & Designers: To specify material requirements and ensure components meet weight targets.
- Manufacturers: For inventory management, production planning, and quality assurance.
- Purchasing Managers: To verify the weight of received materials and manage costs.
- Fabricators: To estimate material needs for custom projects and optimize cutting.
- Hobbyists & Makers: For small-scale projects in metalworking, jewelry making, or model building.
- Students & Educators: To learn about material science, physics, and engineering principles.
Common Misconceptions:
- Weight is constant: Metal density can vary slightly with alloys and temperature, though for practical purposes, standard values are used.
- Shape doesn't matter: Volume calculation is shape-dependent; a block and a sphere of the same mass will have different dimensions.
- Online calculators are just estimates: Our calculator uses precise formulas and standard densities for high accuracy.
Metal Weight Calculator Formula and Mathematical Explanation
The core principle behind any {primary_keywor} is the fundamental relationship between mass, volume, and density:
Mass = Volume × Density
The calculator breaks this down into several steps:
- Determine Metal Density: Based on the user's selection (e.g., Steel, Aluminum, Copper), the calculator retrieves a standard density value for that metal.
- Calculate Volume: This is the most complex step, as it depends on the selected shape and its dimensions. The calculator uses specific geometric formulas for each shape.
- Calculate Mass (Weight): Once volume and density are known, they are multiplied to yield the final weight.
The units used (metric or imperial) are consistently applied throughout the calculation to ensure accurate results. For example, if using metric units (kg and cm), the density must be in kg/cm³ or a compatible unit, and the resulting volume will be in cm³. If imperial units (lbs and inches) are used, density might be in lbs/in³.
Variable Explanations:
| Variable | Meaning | Unit (Metric) | Unit (Imperial) | Typical Range |
|---|---|---|---|---|
| Metal Type | The specific metal or alloy being measured. | N/A | N/A | Common Metals (Steel, Al, Cu, etc.) |
| Shape | The geometric form of the metal piece. | N/A | N/A | Rectangular Prism, Cylinder, Sphere, etc. |
| Dimensions | Measurements defining the size of the shape (e.g., length, width, height, diameter, radius). | cm, mm | inches | Varies greatly based on application |
| Density | Mass per unit volume of the specific metal. | g/cm³, kg/m³ | lbs/in³, lbs/ft³ | ~0.00785 kg/cm³ (Steel) to ~21.45 kg/cm³ (Gold) |
| Volume | The amount of space occupied by the metal piece. | cm³, m³ | in³, ft³ | Calculated based on dimensions and shape |
| Weight (Mass) | The final calculated mass of the metal piece. | kg, g, tonnes | lbs, oz | Calculated result |
Volume Formulas by Shape:
- Rectangular Prism: Volume = Length × Width × Height
- Cylinder: Volume = π × Radius² × Height (or π × (Diameter/2)² × Height)
- Sphere: Volume = (4/3) × π × Radius³
Practical Examples (Real-World Use Cases)
The {primary_keyword} is versatile, serving numerous practical applications:
Example 1: Steel Plate for a Construction Project
A structural engineer needs to determine the weight of a steel plate to be used as a base for a support column. The plate dimensions are 120 cm long, 80 cm wide, and 2 cm thick. The metal is standard mild steel.
- Inputs:
- Metal Type: Steel
- Shape: Rectangular Prism
- Length: 120 cm
- Width: 80 cm
- Height (Thickness): 2 cm
- Units: Metric (kg, cm)
- Calculations:
- Volume = 120 cm × 80 cm × 2 cm = 19,200 cm³
- Density of Steel ≈ 7.85 g/cm³ (which is 0.00785 kg/cm³)
- Weight = 19,200 cm³ × 0.00785 kg/cm³ ≈ 150.72 kg
- Result Interpretation: The steel plate weighs approximately 150.72 kg. This is crucial for load calculations, transportation planning, and material costing. This accurate calculation helps avoid under or over-ordering materials.
Example 2: Aluminum Rod for a Machining Project
A machinist needs to know the weight of an aluminum rod to estimate material cost. The rod is 50 inches long with a diameter of 1.5 inches. The material is 6061 Aluminum.
- Inputs:
- Metal Type: Aluminum
- Shape: Cylinder
- Length: 50 inches
- Diameter: 1.5 inches
- Units: Imperial (lbs, inches)
- Calculations:
- Radius = Diameter / 2 = 1.5 inches / 2 = 0.75 inches
- Volume = π × (0.75 in)² × 50 in ≈ 3.14159 × 0.5625 in² × 50 in ≈ 88.36 in³
- Density of Aluminum ≈ 0.098 lbs/in³
- Weight = 88.36 in³ × 0.098 lbs/in³ ≈ 8.66 lbs
- Result Interpretation: The aluminum rod weighs approximately 8.66 lbs. This figure is vital for procurement, as it directly influences the cost of raw materials and helps manage project budgets effectively. This example highlights how the {primary_keyword} aids in precise financial planning.
How to Use This Metal Weight Calculator
Using our online {primary_keyword} is straightforward. Follow these steps for accurate metal weight estimations:
- Select Metal Type: Choose the specific metal (e.g., Steel, Aluminum, Copper) from the dropdown menu. This selects the correct density value for the calculation.
- Choose Shape: Select the geometric shape of your metal piece (e.g., Rectangular Prism, Cylinder, Sphere). This determines which volume formula will be used.
- Enter Dimensions: Based on the chosen shape, input the required dimensions (e.g., length, width, height, diameter, radius). Ensure you use the units specified by the helper text or your selected unit system.
- Select Units: Choose either 'Metric' (kilograms, centimeters) or 'Imperial' (pounds, inches) for your input dimensions and output weight. The calculator will handle conversions internally if necessary for density lookups.
- Click 'Calculate Weight': Once all fields are filled correctly, click the button. The calculator will process your inputs and display the results.
Reading Results:
- Primary Result: The most prominent number is your calculated metal weight.
- Intermediate Values: You'll see the calculated Volume, the Density of the selected metal, and the Dimensions used.
- Table Breakdown: A detailed table provides a full summary of all inputs and calculated values, including units.
- Chart: Visualizes the relationship between volume and weight.
Decision-Making Guidance:
- Procurement: Use the weight to order the precise amount of material needed, preventing waste and cost overruns.
- Engineering: Verify if a component meets weight specifications for its intended application (e.g., aerospace, automotive).
- Shipping: Estimate shipping costs accurately based on the total weight of metal parts.
- Costing: Accurately factor material costs into project quotes and budgets.
For offline use, consider the 'metal weight calculator download' option which provides the same functionality without internet dependency. This is particularly useful for field work or secure environments. You can [link to a download page, e.g., `/metal-calculator-download`] to get the offline version.
Key Factors That Affect Metal Weight Calculator Results
While the basic formula (Weight = Volume × Density) is simple, several factors can influence the accuracy and application of a metal weight calculator:
- Alloy Variations: The 'Steel' or 'Aluminum' selected represents a range of alloys. Different alloys of the same base metal can have slightly different densities, affecting the final weight. For highly critical applications, specifying the exact alloy designation is recommended.
- Temperature Effects: Metal density changes slightly with temperature. Most calculators use standard density values at room temperature. Significant temperature variations in application might require adjustments.
- Manufacturing Tolerances: Real-world metal parts rarely have perfect dimensions. Manufacturing variations (tolerances) in length, width, diameter, etc., will lead to slight differences between the calculated and actual weight. Using the nominal or average dimensions is typical.
- Hollow Shapes vs. Solid: Our calculator assumes solid shapes. If calculating the weight of a hollow tube or pipe, you must account for the inner dimensions to subtract the volume of the empty space. This requires using a modified calculation or a specialized calculator. You can learn more about [calculating pipe weight](related_link_1_url).
- Unit Consistency: Inconsistent unit usage (e.g., mixing cm and mm without conversion) is a common source of error. Always ensure all dimensions are in the same unit system before input, or rely on the calculator's unit selection feature.
- Density Data Accuracy: The accuracy of the calculator depends on the density data it uses. Reputable calculators reference standard engineering handbooks for these values. When looking for a [metal density chart](related_link_2_url), ensure the source is reliable.
- Rounding: Intermediate rounding during calculations can introduce small errors. Using high-precision calculations, as done by this tool, minimizes such issues.
- Corrosion or Coating: Surface treatments like plating or significant corrosion can add or remove a small amount of mass. This calculator typically deals with the base metal weight.
Frequently Asked Questions (FAQ)
Q1: What is the difference between weight and mass?
Technically, mass is the amount of matter in an object, while weight is the force exerted on that mass by gravity. In everyday use and in most calculators like this one, 'weight' is used interchangeably with 'mass'. The units (kg, lbs) typically refer to mass.
Q2: Can I use this calculator for alloys not listed?
While we provide common metals, you can often approximate by selecting a similar base metal or by finding the specific density of your alloy and inputting it if the calculator allowed custom density. For precise calculations, it's best to use a tool that supports custom density inputs or refer to specific alloy data sheets.
Q3: How accurate is the metal weight calculator download version?
The download version uses the exact same formulas and density data as the online version, ensuring identical accuracy. Its main advantage is offline accessibility.
Q4: What if my metal piece has a complex shape?
This calculator supports basic geometric shapes. For complex or irregular shapes, you might need to approximate the volume using simpler shapes, break the object into multiple simpler parts, or use specialized CAD software with volume calculation features. You might find resources on [calculating complex shapes](related_link_3_url) helpful.
Q5: Does the calculator account for material waste during cutting?
No, this calculator determines the theoretical weight of the final dimensions provided. It does not include factors like material waste from sawing, machining, or offcuts. You would need to add a buffer for waste based on your cutting process.
Q6: What density values are used?
We use standard, widely accepted density values for common metals and alloys, typically sourced from engineering references like Machinery's Handbook or material science databases. These are average values at room temperature.
Q7: Can I calculate the weight of sheet metal or thin plates?
Yes, simply select 'Rectangular Prism' and input the length, width, and thickness (which is the height in this case). Ensure your thickness dimension is entered correctly.
Q8: Is there a way to bulk calculate weights for multiple items?
Our online tool calculates one item at a time. For bulk calculations, a downloadable version or integration into a larger inventory system might be necessary. Consider exploring [inventory management solutions](related_link_4_url) if this is a frequent need.
Q9: What if I need to calculate the weight of scrap metal?
Scrap metal density can vary significantly due to contamination, oxidation, and inconsistent composition. While the calculator can provide a rough estimate if you assume a base metal, precise scrap metal weight calculation often requires physical weighing or specialized assaying.
Related Tools and Internal Resources
- Metal Weight Calculator Download: Get our precise calculator for offline use on your computer. Ideal for secure environments and frequent calculations.
- Material Density Converter: Quickly convert density values between different units (e.g., g/cm³ to lbs/in³). Essential for cross-referencing data.
- Sheet Metal Gauge Calculator: Determine the thickness and weight of sheet metal based on standard gauge numbers. Crucial for sheet metal fabrication projects.
- Metal Price Tracker: Stay updated on the fluctuating market prices of various metals. Essential for procurement and sales.
- Custom Metal Fabrication Guide: Learn about the processes involved in custom metal work, from design to finishing.
- Engineering Formulas Cheat Sheet: A collection of essential formulas for various engineering disciplines, including geometry and material science.
Enter the length of the object.
Enter the width of the object.
Enter the height or thickness.
`;
currentShapeDimensions = { length: 0, width: 0, height: 0 };
} else if (shape === 'cylinder') {
html += `
Enter the diameter of the cylinder.
Enter the height of the cylinder.
`;
currentShapeDimensions = { diameter: 0, cylHeight: 0 };
} else if (shape === 'sphere') {
html += `
Enter the diameter of the sphere.
`;
currentShapeDimensions = { sphereDiameter: 0 };
}
container.innerHTML = html;
}
function getInputValue(id) {
var element = document.getElementById(id);
if (!element) return null;
var value = parseFloat(element.value);
return isNaN(value) ? null : value;
}
function validateInput(id, value, min, max, errorMessageId, isRequired = true) {
var errorElement = document.getElementById(errorMessageId);
var inputGroupElement = document.getElementById(id + 'Group'); // Assuming id format like 'lengthGroup'
if (!errorElement || !inputGroupElement) return false;
errorElement.textContent = ";
errorElement.classList.remove('visible');
inputGroupElement.classList.remove('input-error');
if (isRequired && (value === null || value === ")) {
errorElement.textContent = 'This field is required.';
errorElement.classList.add('visible');
inputGroupElement.classList.add('input-error');
return false;
}
if (value !== null && value max) {
errorElement.textContent = `Value cannot be greater than ${max}.`;
errorElement.classList.add('visible');
inputGroupElement.classList.add('input-error');
return false;
}
return true;
}
function calculateWeight() {
// Clear previous chart
if (chartInstance) {
chartInstance.destroy();
chartInstance = null;
}
var metalType = document.getElementById('metalType').value;
var shape = document.getElementById('shape').value;
var unit = document.getElementById('unit').value;
var densityData = metalDensities[metalType];
var errors = false;
// Metal Type Validation
var metalTypeErrorElement = document.getElementById('metalTypeError');
var metalTypeGroupElement = document.getElementById('metalTypeGroup');
metalTypeErrorElement.textContent = ";
metalTypeGroupElement.classList.remove('input-error');
if (!metalType) {
metalTypeErrorElement.textContent = 'Please select a metal type.';
metalTypeErrorElement.classList.add('visible');
metalTypeGroupElement.classList.add('input-error');
errors = true;
}
// Shape Validation
var shapeErrorElement = document.getElementById('shapeError');
var shapeGroupElement = document.getElementById('shapeGroup');
shapeErrorElement.textContent = ";
shapeGroupElement.classList.remove('input-error');
if (!shape) {
shapeErrorElement.textContent = 'Please select a shape.';
shapeErrorElement.classList.add('visible');
shapeGroupElement.classList.add('input-error');
errors = true;
}
// Unit Validation (basic check, select should always have a value)
var unitErrorElement = document.getElementById('unitError');
var unitGroupElement = document.getElementById('unitGroup');
unitErrorElement.textContent = ";
unitGroupElement.classList.remove('input-error');
if (!unit) { // Should not happen with a default option
unitErrorElement.textContent = 'Please select units.';
unitErrorElement.classList.add('visible');
unitGroupElement.classList.add('input-error');
errors = true;
}
var volume = 0;
var dimensionsText = "";
var dimensionsUnit = "";
var volumeUnit = "";
// Dimension Inputs Validation and Volume Calculation
if (shape === 'rectangular_prism') {
var length = getInputValue('length');
var width = getInputValue('width');
var height = getInputValue('height');
if (!validateInput('length', length, 0.001, 10000, 'lengthError') ||
!validateInput('width', width, 0.001, 10000, 'widthError') ||
!validateInput('height', height, 0.001, 10000, 'heightError')) {
errors = true;
} else {
currentShapeDimensions = { length: length, width: width, height: height };
dimensionsText = length + " x " + width + " x " + height;
volume = length * width * height;
dimensionsUnit = unit === 'metric' ? 'cm' : 'inches';
volumeUnit = unit === 'metric' ? 'cm³' : 'in³';
}
} else if (shape === 'cylinder') {
var diameter = getInputValue('diameter');
var cylHeight = getInputValue('cylHeight');
if (!validateInput('diameter', diameter, 0.001, 10000, 'diameterError') ||
!validateInput('cylHeight', cylHeight, 0.001, 10000, 'cylHeightError')) {
errors = true;
} else {
currentShapeDimensions = { diameter: diameter, cylHeight: cylHeight };
var radius = diameter / 2;
dimensionsText = "Diameter: " + diameter + ", Height: " + cylHeight;
volume = Math.PI * Math.pow(radius, 2) * cylHeight;
dimensionsUnit = unit === 'metric' ? 'cm' : 'inches';
volumeUnit = unit === 'metric' ? 'cm³' : 'in³';
}
} else if (shape === 'sphere') {
var sphereDiameter = getInputValue('sphereDiameter');
if (!validateInput('sphereDiameter', sphereDiameter, 0.001, 10000, 'sphereDiameterError')) {
errors = true;
} else {
currentShapeDimensions = { sphereDiameter: sphereDiameter };
var radius = sphereDiameter / 2;
dimensionsText = "Diameter: " + sphereDiameter;
volume = (4/3) * Math.PI * Math.pow(radius, 3);
dimensionsUnit = unit === 'metric' ? 'cm' : 'inches';
volumeUnit = unit === 'metric' ? 'cm³' : 'in³';
}
}
if (errors) {
document.getElementById('primaryResult').textContent = '–';
document.getElementById('volumeResult').textContent = 'Volume: –';
document.getElementById('densityResult').textContent = 'Density: –';
document.getElementById('dimensionsResult').textContent = 'Dimensions: –';
updateTable('Calculation Failed', ", ", ", ", ");
return;
}
var density = 0;
var densityUnit = ";
var weight = 0;
var weightUnit = ";
if (unit === 'metric') {
density = densityData.density_metric;
densityUnit = densityData.unit_metric;
// Convert density from g/cm³ to kg/cm³ for calculation
weight = volume * (density / 1000);
weightUnit = 'kg';
} else { // Imperial
density = densityData.density_imperial;
densityUnit = densityData.unit_imperial;
weight = volume * density;
weightUnit = 'lbs';
}
// Rounding for display
var roundedVolume = volume.toFixed(3);
var roundedDensity = density.toFixed(3);
var roundedWeight = weight.toFixed(3);
// Update Results Display
document.getElementById('primaryResult').textContent = roundedWeight + ' ' + weightUnit;
document.getElementById('volumeResult').textContent = 'Volume: ' + roundedVolume + ' ' + volumeUnit;
document.getElementById('densityResult').textContent = 'Density: ' + roundedDensity + ' ' + densityUnit;
document.getElementById('dimensionsResult').textContent = 'Dimensions: ' + dimensionsText + ' (' + dimensionsUnit + ')';
// Update Table
updateTable(
densityData.name,
shape.replace('_', ' ').toUpperCase(),
dimensionsText,
dimensionsUnit,
roundedVolume,
volumeUnit,
roundedDensity,
densityUnit,
roundedWeight,
weightUnit
);
// Update Chart
updateChart(parseFloat(roundedVolume), parseFloat(roundedWeight), volumeUnit, weightUnit);
}
function updateTable(metal, shape, dims, dimUnit, vol, volUnit, dens, densUnit, weight, weightUnit) {
document.getElementById('tableMetalType').textContent = metal;
document.getElementById('tableShape').textContent = shape;
document.getElementById('tableDimensions').textContent = dims;
document.getElementById('tableDimensionsUnit').textContent = dimUnit;
document.getElementById('tableVolume').textContent = vol === " ? '–' : vol;
document.getElementById('tableVolumeUnit').textContent = volUnit;
document.getElementById('tableDensity').textContent = dens === " ? '–' : dens;
document.getElementById('tableDensityUnit').textContent = densUnit;
document.getElementById('tableWeight').textContent = weight === " ? '–' : weight;
document.getElementById('tableWeightUnit').textContent = weightUnit;
}
function updateChart(volume, weight, volumeUnit, weightUnit) {
var ctx = document.getElementById('weightChart').getContext('2d');
// Data for chart
var chartData = {
labels: ['Volume', 'Weight'],
datasets: [{
label: 'Volume (' + volumeUnit + ')',
data: [volume, 0], // Volume value, 0 for weight dataset
backgroundColor: 'rgba(0, 74, 153, 0.6)', // Primary color
borderColor: 'rgba(0, 74, 153, 1)',
borderWidth: 1
}, {
label: 'Weight (' + weightUnit + ')',
data: [0, weight], // Weight value, 0 for volume dataset
backgroundColor: 'rgba(40, 167, 69, 0.6)', // Success color
borderColor: 'rgba(40, 167, 69, 1)',
borderWidth: 1
}]
};
chartInstance = new Chart(ctx, {
type: 'bar', // Use bar chart for distinct values
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Value'
}
},
x: {
title: {
display: true,
text: 'Metric'
}
}
},
plugins: {
legend: {
display: false // Legend is shown via HTML below canvas
},
title: {
display: true,
text: 'Volume vs. Calculated Weight'
}
}
}
});
}
function copyResults() {
var primaryResult = document.getElementById('primaryResult').textContent;
var volumeResult = document.getElementById('volumeResult').textContent;
var densityResult = document.getElementById('densityResult').textContent;
var dimensionsResult = document.getElementById('dimensionsResult').textContent;
var tableMetalType = document.getElementById('tableMetalType').textContent;
var tableShape = document.getElementById('tableShape').textContent;
var tableDimensions = document.getElementById('tableDimensions').textContent;
var tableDimensionsUnit = document.getElementById('tableDimensionsUnit').textContent;
var tableVolume = document.getElementById('tableVolume').textContent;
var tableVolumeUnit = document.getElementById('tableVolumeUnit').textContent;
var tableDensity = document.getElementById('tableDensity').textContent;
var tableDensityUnit = document.getElementById('tableDensityUnit').textContent;
var tableWeight = document.getElementById('tableWeight').textContent;
var tableWeightUnit = document.getElementById('tableWeightUnit').textContent;
var assumptions = `Key Assumptions:\nMetal Type: ${tableMetalType}\nShape: ${tableShape}`;
var details = `Calculated Details:\nDimensions: ${tableDimensions} ${tableDimensionsUnit}\nVolume: ${tableVolume} ${tableVolumeUnit}\nDensity: ${tableDensity} ${tableDensityUnit}\nWeight: ${tableWeight} ${tableWeightUnit}`;
var textToCopy = `— Metal Weight Calculation Results —\n\nPrimary Result: ${primaryResult}\n\n${assumptions}\n\n${details}\n\n— End Results —`;
if (navigator.clipboard && window.isSecureContext) {
navigator.clipboard.writeText(textToCopy).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy text: ', err);
fallbackCopyTextToClipboard(textToCopy);
});
} else {
fallbackCopyTextToClipboard(textToCopy);
}
}
function fallbackCopyTextToClipboard(text) {
var textArea = document.createElement("textarea");
textArea.value = text;
textArea.style.position = "fixed";
textArea.style.top = "0";
textArea.style.left = "0";
textArea.style.width = "2em";
textArea.style.height = "2em";
textArea.style.padding = "0";
textArea.style.border = "none";
textArea.style.outline = "none";
textArea.style.boxShadow = "none";
textArea.style.background = "transparent";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
alert('Results copied to clipboard! (' + msg + ')');
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
alert('Failed to copy results. Please copy manually.');
}
document.body.removeChild(textArea);
}
function resetCalculator() {
document.getElementById('metalType').value = ";
document.getElementById('shape').value = ";
document.getElementById('unit').value = 'metric';
// Clear dynamic dimensions inputs
document.getElementById('dimensionsInputContainer').innerHTML = ";
currentShapeDimensions = {};
// Clear error messages
var errorElements = document.querySelectorAll('.error-message');
errorElements.forEach(function(el) {
el.textContent = ";
el.classList.remove('visible');
});
var inputGroupElements = document.querySelectorAll('.input-group');
inputGroupElements.forEach(function(el) {
el.classList.remove('input-error');
});
// Reset results display
document.getElementById('primaryResult').textContent = '–';
document.getElementById('volumeResult').textContent = 'Volume: –';
document.getElementById('densityResult').textContent = 'Density: –';
document.getElementById('dimensionsResult').textContent = 'Dimensions: –';
updateTable(",",",",",",",",",");
// Clear chart
if (chartInstance) {
chartInstance.destroy();
chartInstance = null;
}
// Re-initialize canvas context if needed, though destroy should handle it.
var canvas = document.getElementById('weightChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
// Initial setup
document.addEventListener('DOMContentLoaded', function() {
updateDimensionsInputs(); // Set up initial dimension fields based on default shape selection if any
// Attach event listener for shape change to update dimensions inputs
document.getElementById('shape').addEventListener('change', updateDimensionsInputs);
// Trigger initial calculation if defaults are set or to show placeholders
// calculateWeight(); // Can be called if you want initial calculation or just placeholders
});
// Simple Chart.js polyfill for older browsers if needed, but canvas API is usually available.
// For a production environment, consider a proper polyfill or check browser support.
// For this exercise, assuming modern browser with Canvas support.
// NOTE: This example does NOT include Chart.js library. Native canvas drawing is more complex.
// The below is a placeholder demonstrating how one *might* approach native canvas drawing
// IF Chart.js was not available and a simple bar was needed.
// For a real-world scenario, Chart.js or another library is recommended for ease of use.
// Placeholder for native Canvas drawing if Chart.js wasn't used (requires significant effort)
// This is NOT a working chart implementation, just conceptual.
// Replace with Chart.js inclusion or a full native canvas drawing implementation.
/*
function drawNativeChart(volume, weight, volumeUnit, weightUnit) {
var canvas = document.getElementById('weightChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear canvas
var barWidth = 50;
var barSpacing = 30;
var chartAreaWidth = canvas.width – 40; // Padding
var chartAreaHeight = canvas.height – 60; // Padding + Title space
var maxValue = Math.max(volume, weight);
var scaleY = chartAreaHeight / maxValue;
// Draw Volume Bar
ctx.fillStyle = 'rgba(0, 74, 153, 0.6)';
var volHeight = volume * scaleY;
ctx.fillRect(40, canvas.height – 20 – volHeight, barWidth, volHeight);
ctx.fillStyle = '#333';
ctx.fillText('Volume', 40, canvas.height – 5);
ctx.fillText(volume.toFixed(1) + ' ' + volumeUnit, 40, canvas.height – 25 – volHeight);
// Draw Weight Bar
ctx.fillStyle = 'rgba(40, 167, 69, 0.6)';
var weightHeight = weight * scaleY;
ctx.fillRect(40 + barWidth + barSpacing, canvas.height – 20 – weightHeight, barWidth, weightHeight);
ctx.fillStyle = '#333';
ctx.fillText('Weight', 40 + barWidth + barSpacing, canvas.height – 5);
ctx.fillText(weight.toFixed(1) + ' ' + weightUnit, 40 + barWidth + barSpacing, canvas.height – 25 – weightHeight);
// Add Title
ctx.fillStyle = '#004a99';
ctx.font = 'bold 16px sans-serif';
ctx.textAlign = 'center';
ctx.fillText('Volume vs. Calculated Weight', canvas.width / 2, 20);
}
*/
// NOTE: The provided code uses Chart.js for simplicity.
// If Chart.js is not available, the chart section will fail.
// For a truly native solution, the drawNativeChart function would need full implementation.