Visualizing how Weight changes with varying Volume at a constant Density (or vice versa).
Density-Volume-Weight Table
Material Properties Overview
Material
Density (kg/m³)
Specific Volume (m³/kg)
Example Weight (kg) for 1 m³
Water
1000
0.001
1000
Aluminum
2700
0.00037
2700
Steel
7850
0.000127
7850
Gold
19300
0.0000518
19300
Air (sea level)
1.225
0.816
1.225
What is a Density Volume Weight Calculator?
{primary_keyword} refers to the fundamental relationship between three crucial physical properties of matter: density, volume, and weight (or more accurately, mass). Understanding this relationship is vital across numerous scientific, engineering, and industrial fields. A density volume weight calculator is an online tool designed to help users quickly and accurately compute any one of these values when the other two are known. It simplifies complex calculations, making them accessible to professionals and students alike. By inputting two known values (e.g., weight and volume), the calculator can instantly derive the third (density) or solve for any other combination.
Material Scientists and Engineers: For material characterization, quality control, and design processes.
Students: To assist with physics and chemistry coursework, helping to grasp core concepts.
Manufacturers and Industrial Designers: For calculating material usage, product weight, and space requirements.
Logistics and Shipping Professionals: To estimate cargo weight and volume for efficient transport planning.
Hobbyists and DIY Enthusiasts: For projects involving materials where precise measurements are needed (e.g., crafting, metalworking).
Academics and Researchers: For quick estimations and data validation in experiments.
Common Misconceptions
A common misconception is the interchangeable use of "weight" and "mass". While often used synonymously in everyday language, they are distinct. Mass is the amount of matter in an object, a fundamental property, while weight is the force of gravity acting upon that mass. This calculator primarily deals with mass, which is proportional to weight under standard gravitational conditions. Another misconception is assuming density is constant for a given material; it can vary slightly with temperature and pressure, although for most practical purposes, standard values are used.
Density Volume Weight Formula and Mathematical Explanation
The relationship between density, volume, and weight (mass) is elegantly defined by a simple yet powerful formula. This formula forms the backbone of our density volume weight calculator.
The Core Formula
The fundamental equation is:
Density = Mass / Volume
In symbols, this is often represented as:
ρ = m / V
Where:
ρ (rho) represents density.
m represents mass (often referred to as weight in common usage).
V represents volume.
Deriving Other Variables
By rearranging this basic formula, we can solve for mass or volume:
To calculate Mass (Weight): If you know the density and volume, you can find the mass using: Mass = Density × Volume ( m = ρ × V )
To calculate Volume: If you know the mass and density, you can find the volume using: Volume = Mass / Density ( V = m / ρ )
Variable Explanations and Units
Understanding the units is critical for accurate calculations. The calculator allows for various common units, but consistency is key.
Highly variable, from nanoliters to cubic kilometers.
Density (ρ)
Mass per unit of volume. Indicates how compact the matter is.
Kilograms per cubic meter (kg/m³), Grams per cubic centimeter (g/cm³), Pounds per cubic foot (lb/ft³), Specific Gravity (dimensionless, relative to water)
Ranges from extremely low (gases like Hydrogen) to very high (heavy metals like Osmium).
Note: Specific Gravity is the ratio of a substance's density to the density of a reference substance, usually water (approx. 1000 kg/m³ or 1 g/cm³). For liquids and solids, Specific Gravity is numerically very close to density in g/cm³ or kg/L.
Example 1: Calculating the Weight of a Steel Block
Scenario: An engineer needs to know the weight of a solid steel block with specific dimensions for structural analysis. The steel has a known density.
Given:
Material: Steel
Density of Steel (ρ): Approximately 7850 kg/m³
Dimensions of the block: Length = 2 meters, Width = 1 meter, Height = 0.5 meters
Step 1: Calculate Volume
Volume (V) = Length × Width × Height
V = 2 m × 1 m × 0.5 m = 1 m³
Step 2: Use the Calculator (or formula) to find Weight
We know Density (7850 kg/m³) and Volume (1 m³). We want to calculate Mass.
Mass (m) = Density (ρ) × Volume (V)
m = 7850 kg/m³ × 1 m³ = 7850 kg
Result: The steel block weighs 7850 kg. This is crucial for understanding load-bearing capacities and shipping costs.
Example 2: Determining the Volume of a Liquid
Scenario: A chemist has a precisely measured amount of a chemical solution and knows its density. They need to determine the volume it occupies for an experiment.
Given:
Substance: Chemical Solution
Mass of Solution (m): 500 grams (g)
Density of Solution (ρ): 1.2 g/cm³
Step 1: Use the Calculator (or formula) to find Volume
We know Mass (500 g) and Density (1.2 g/cm³). We want to calculate Volume.
Volume (V) = Mass (m) / Density (ρ)
V = 500 g / 1.2 g/cm³ ≈ 416.67 cm³
Step 2: Convert Units if necessary
The result is in cubic centimeters (cm³). If the experiment requires milliliters (mL), note that 1 cm³ = 1 mL.
So, V ≈ 416.67 mL
Result: The 500g of chemical solution occupies approximately 416.67 cubic centimeters or milliliters. This helps in accurately measuring reagents for reactions.
Example 3: Calculating Density of an Unknown Material
Scenario: A geologist finds a rock sample and wants to identify its basic material properties. They measure its mass and volume.
Given:
Sample Mass (m): 250 grams (g)
Sample Volume (V): 100 cubic centimeters (cm³)
Step 1: Use the Calculator (or formula) to find Density
We know Mass (250 g) and Volume (100 cm³). We want to calculate Density.
Density (ρ) = Mass (m) / Volume (V)
ρ = 250 g / 100 cm³ = 2.5 g/cm³
Result: The density of the rock sample is 2.5 g/cm³. Comparing this value to known densities of minerals can help in preliminary identification. For instance, this is close to the density of Quartz.
Select Calculation Type: Choose what you want to calculate from the "I want to calculate:" dropdown menu (Density, Volume, or Weight/Mass).
Input Known Values:
If calculating Density, enter the known Weight (Mass) and Volume.
If calculating Volume, enter the known Weight (Mass) and Density.
If calculating Weight (Mass), enter the known Volume and Density.
*Note: Only the two fields relevant to your selection will be active and require input. The third will be disabled.*
Select Units: Choose the appropriate units for mass and volume from the "Units" dropdown. Ensure consistency; for example, if your mass is in kilograms, your volume should be in cubic meters (or liters, depending on context). The calculator will automatically derive the density unit based on your selections (e.g., kg/m³).
Click "Calculate": Press the "Calculate" button.
View Results: The main result (the value you selected to calculate) will be displayed prominently. Key intermediate values (the other two properties) and the formula used will also be shown.
How to Read Results
Main Result: This is your primary calculated value, highlighted for clarity.
Intermediate Results: These show the other two properties (mass, volume, density) based on your inputs and the calculation performed. They help confirm consistency.
Formula Explanation: A brief text explains the mathematical operation performed.
Material Selection: Comparing densities helps choose materials that are lighter or heavier for a given volume.
Logistics Planning: Knowing the weight and volume of goods is essential for optimizing cargo space and adhering to weight limits.
Engineering Design: Accurate calculations ensure structural integrity and appropriate material usage.
Cost Estimation: Material cost is often tied to weight or volume.
Scientific Accuracy: Crucial for experiments where precise quantities are needed.
Key Factors That Affect Density Volume Weight Results
While the core formulas for density, volume, and weight are straightforward, several real-world factors can influence the accuracy and interpretation of results:
1. Temperature
Density is temperature-dependent. Most substances expand when heated and contract when cooled. As volume changes, density (mass/volume) also changes, assuming mass remains constant. For gases, this effect is particularly pronounced. For precise scientific work, temperature must be standardized or accounted for.
2. Pressure
Similar to temperature, pressure significantly affects the density of gases. Higher pressure compresses a gas, reducing its volume and increasing its density. Liquids and solids are much less compressible, so pressure has a minor effect on their density under normal conditions.
3. Purity and Composition
The density of a substance is specific to its chemical composition. Impurities or alloying elements can alter the density. For example, different types of steel have slightly different densities due to varying carbon and other alloy content. Always use the density value specific to the material being measured.
4. Phase of Matter
The state of matter (solid, liquid, gas) dramatically impacts density. Generally, solids are denser than their liquid forms (water is a notable exception), and liquids are far denser than their gaseous forms. Ensure you are using the density value appropriate for the substance's current phase.
5. Measurement Accuracy
The precision of the input values directly impacts the output. Inaccurate measurements of mass (using a faulty scale) or volume (imprecise measuring tools, irregular shapes) will lead to incorrect density or weight calculations. Always use calibrated instruments.
6. Porosity and Voids
For materials like concrete, wood, or certain metals, internal porosity (small holes or air pockets) can significantly affect the bulk density. A material might have a high density for its constituent substance, but its overall measured density will be lower if it contains significant voids. The calculated "weight" will reflect this lower bulk density.
7. Unit Consistency
A critical factor often overlooked is unit consistency. If mass is measured in kilograms and volume in cubic centimeters, a direct calculation without conversion will yield a nonsensical density unit (kg/cm³). Always ensure all input units are compatible or convert them appropriately before calculation.
Frequently Asked Questions (FAQ)
Q: What's the difference between weight and mass?
Mass is the amount of matter in an object and is constant regardless of location. Weight is the force of gravity acting on that mass. Our calculator uses "Weight (Mass)" to indicate that we are calculating the mass, which is often colloquially referred to as weight. The unit of mass is typically kilograms or pounds.
Q: Can I use this calculator for gases?
Yes, but be mindful of the significant impact of temperature and pressure on gas density. Ensure your input values reflect the conditions under which the gas exists.
Q: What does it mean if the density is very high or very low?
High density means a lot of mass is packed into a small volume (e.g., lead, gold). Low density means the same volume contains less mass (e.g., styrofoam, gases). This relates to how compact the material is.
Q: Which units are best to use?
The "best" units depend on your context. For scientific work, the SI units (kilograms for mass, cubic meters for volume, kg/m³ for density) are standard. For everyday use or specific industries, other units like pounds, ounces, liters, or cubic feet might be more convenient. The key is consistency.
Q: How accurate is the calculator?
The calculator performs the mathematical operations with high precision. However, the accuracy of the output depends entirely on the accuracy of the input values you provide (mass, volume, density) and the standard values used for different materials.
Q: What is specific volume?
Specific volume is the reciprocal of density (Volume / Mass). It represents the volume occupied by a unit of mass. While density tells you how much mass is in a given space, specific volume tells you how much space a given mass takes up. It's often used in thermodynamics and fluid dynamics.
Q: Can I calculate the density of an irregular object?
Yes, you can find the volume of an irregular object using methods like water displacement. Once you have its mass and this calculated volume, you can use the calculator to find its density.
Q: Why is the calculator showing an error or NaN?
This usually happens if you enter non-numeric data, leave required fields blank, or divide by zero (e.g., trying to calculate density with zero volume). Ensure all inputs are valid numbers and that you are not attempting an impossible calculation.
var calculationTypeSelect = document.getElementById('calculationType');
var weightInputGroup = document.getElementById('weightInputGroup');
var volumeInputGroup = document.getElementById('volumeInputGroup');
var densityInputGroup = document.getElementById('densityInputGroup');
var weightInput = document.getElementById('weight');
var volumeInput = document.getElementById('volume');
var densityInput = document.getElementById('density');
var unitSelect = document.getElementById('unit');
var resultsContainer = document.getElementById('resultsContainer');
var mainResult = document.getElementById('mainResult');
var intermediateWeightSpan = document.getElementById('intermediateWeight').getElementsByTagName('span')[0];
var intermediateVolumeSpan = document.getElementById('intermediateVolume').getElementsByTagName('span')[0];
var intermediateDensitySpan = document.getElementById('intermediateDensity').getElementsByTagName('span')[0];
var formulaExplanation = document.getElementById('formulaExplanation');
var chart; // Declare chart globally
var chartCanvas = document.getElementById('densityVolumeChart').getContext('2d');
// Function to update input field visibility and labels based on calculation type
function updateInputVisibility() {
var type = calculationTypeSelect.value;
// Reset all fields to default state
weightInput.disabled = false;
volumeInput.disabled = false;
densityInput.disabled = false;
weightInput.classList.remove('error-highlight');
volumeInput.classList.remove('error-highlight');
densityInput.classList.remove('error-highlight');
document.getElementById('weightError').textContent = ";
document.getElementById('volumeError').textContent = ";
document.getElementById('densityError').textContent = ";
if (type === 'density') {
weightInput.disabled = false;
volumeInput.disabled = false;
densityInput.disabled = true;
weightInput.style.backgroundColor = 'var(–light-gray)';
volumeInput.style.backgroundColor = 'var(–light-gray)';
densityInput.style.backgroundColor = 'var(–medium-gray)';
densityInput.value = "; // Clear disabled field
} else if (type === 'volume') {
weightInput.disabled = false;
volumeInput.disabled = true;
densityInput.disabled = false;
volumeInput.style.backgroundColor = 'var(–medium-gray)';
weightInput.style.backgroundColor = 'var(–light-gray)';
densityInput.style.backgroundColor = 'var(–light-gray)';
volumeInput.value = "; // Clear disabled field
} else if (type === 'weight') {
weightInput.disabled = true;
volumeInput.disabled = false;
densityInput.disabled = false;
weightInput.style.backgroundColor = 'var(–medium-gray)';
volumeInput.style.backgroundColor = 'var(–light-gray)';
densityInput.style.backgroundColor = 'var(–light-gray)';
weightInput.value = "; // Clear disabled field
}
}
// Function to get selected unit types
function getSelectedUnitTypes() {
var selectedOption = unitSelect.options[unitSelect.selectedIndex];
var massUnit = selectedOption.getAttribute('data-unit-type') === 'mass' ? selectedOption.value : null;
var volumeUnit = selectedOption.getAttribute('data-unit-type') === 'volume' ? selectedOption.value : null;
// Simple heuristic to determine mass and volume units based on selected unit
// This needs refinement for better accuracy
var massUnitGuess = 'kg'; // Default
var volumeUnitGuess = 'm3'; // Default
var selectedMassOptions = Array.from(unitSelect.options).filter(opt => opt.getAttribute('data-unit-type') === 'mass');
var selectedVolumeOptions = Array.from(unitSelect.options).filter(opt => opt.getAttribute('data-unit-type') === 'volume');
if (selectedMassOptions.length > 0) massUnitGuess = selectedMassOptions[0].value;
if (selectedVolumeOptions.length > 0) volumeUnitGuess = selectedVolumeOptions[0].value;
// Check if the currently selected unit is a mass unit
if (selectedOption.getAttribute('data-unit-type') === 'mass') {
massUnitGuess = selectedOption.value;
// Try to find a corresponding volume unit
if (volumeUnitGuess === 'm3') volumeUnitGuess = 'm3'; // Default if no better match
} else if (selectedOption.getAttribute('data-unit-type') === 'volume') {
volumeUnitGuess = selectedOption.value;
// Try to find a corresponding mass unit
if (massUnitGuess === 'kg') massUnitGuess = 'kg'; // Default if no better match
}
// Fallback: if selection doesn't make sense, use defaults
if (!massUnitGuess) massUnitGuess = 'kg';
if (!volumeUnitGuess) volumeUnitGuess = 'm3';
return { mass: massUnitGuess, volume: volumeUnitGuess };
}
// Function to convert units to a common base for calculation (e.g., kg and m^3)
function convertToBaseUnits(value, unit) {
var conversions = {
kg: 1, g: 0.001, lbs: 0.453592, oz: 0.0283495, // Mass to kg
m3: 1, cm3: 0.000001, l: 0.001, ml: 0.000001, in3: 0.0000163871, ft3: 0.0283168 // Volume to m3
};
if (conversions[unit] !== undefined) {
return value * conversions[unit];
}
return null; // Invalid unit
}
// Function to convert from base units back to selected units for display
function convertFromBaseUnits(value, unit) {
var conversions = {
kg: 1, g: 1000, lbs: 2.20462, oz: 35.274, // kg to unit
m3: 1, cm3: 1000000, l: 1000, ml: 1000000, in3: 61023.7, ft3: 35.3147 // m3 to unit
};
if (conversions[unit] !== undefined) {
return value / conversions[unit];
}
return null; // Invalid unit
}
function validateInput(inputId, value, label, min = -Infinity, max = Infinity) {
var errorElement = document.getElementById(inputId + 'Error');
var inputElement = document.getElementById(inputId);
errorElement.textContent = ";
inputElement.classList.remove('error-highlight');
if (isNaN(value) || value === ") {
errorElement.textContent = 'Please enter a valid number.';
inputElement.classList.add('error-highlight');
return false;
}
if (value < 0) {
errorElement.textContent = 'Value cannot be negative.';
inputElement.classList.add('error-highlight');
return false;
}
if (value max) {
errorElement.textContent = `${label} must be between ${min} and ${max}.`;
inputElement.classList.add('error-highlight');
return false;
}
return true;
}
function formatNumber(num, decimals = 2) {
if (num === null || isNaN(num)) return '–';
return num.toFixed(decimals).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
function calculateDensityVolumeWeight() {
var type = calculationTypeSelect.value;
var unitSelection = getSelectedUnitTypes();
var massUnit = unitSelection.mass;
var volumeUnit = unitSelection.volume;
var weightVal = parseFloat(weightInput.value);
var volumeVal = parseFloat(volumeInput.value);
var densityVal = parseFloat(densityInput.value);
var baseWeight = null;
var baseVolume = null;
var baseDensity = null;
var isValid = true;
var calculationResult = '–';
var calculatedWeight = null;
var calculatedVolume = null;
var calculatedDensity = null;
var formula = ";
// — Input Validation —
var weightValid = true;
var volumeValid = true;
var densityValid = true;
if (!weightInput.disabled) weightValid = validateInput('weight', weightVal, 'Weight');
if (!volumeInput.disabled) volumeValid = validateInput('volume', volumeVal, 'Volume');
if (!densityInput.disabled) densityValid = validateInput('density', densityVal, 'Density');
if (!weightValid || !volumeValid || !densityValid) {
isValid = false;
}
// — Unit Conversion and Calculation —
if (isValid) {
// Convert inputs to base units (kg and m^3) if they are provided and enabled
if (!weightInput.disabled && weightValid) baseWeight = convertToBaseUnits(weightVal, massUnit);
if (!volumeInput.disabled && volumeValid) baseVolume = convertToBaseUnits(volumeVal, volumeUnit);
if (!densityInput.disabled && densityValid) {
// Density conversion is trickier as it depends on mass and volume units.
// We'll assume kg/m^3 as base, and handle conversions for input density later.
// For now, let's assume density is entered in a compatible system or convert if possible.
// A more robust solution would involve a full unit system.
// For simplicity here, we'll assume density input is in kg/m^3 or g/cm^3 for now.
// A full implementation would require more detailed unit mapping.
// Let's map common density units to kg/m³
var densityInputUnit = 'kg/m³'; // Default assumption, needs to be dynamically determined or selected
// Simplified density conversion (assuming common units)
if (densityVal !== null && densityVal !== ") {
if (unitSelect.value.includes('g/cm')) { // Crude check
baseDensity = densityVal * 1000; // g/cm³ to kg/m³
} else if (unitSelect.value.includes('lb/ft')) { // Crude check
baseDensity = densityVal * 16.0185; // lb/ft³ to kg/m³
} else {
baseDensity = densityVal; // Assume kg/m³ or similar
}
}
}
if (type === 'density') {
formula = 'Density = Weight / Volume';
if (baseWeight !== null && baseVolume !== null && baseVolume !== 0) {
calculatedDensity = baseWeight / baseVolume;
// Convert base density back to a standard display unit, e.g., kg/m³
mainResult.textContent = formatNumber(calculatedDensity) + ' kg/m³';
formulaExplanation.textContent = 'Calculated density using the formula: ρ = m / V';
// Calculate intermediate values in their base units first, then convert for display
calculatedWeight = baseWeight; // Already in kg
calculatedVolume = baseVolume; // Already in m³
intermediateWeightSpan.textContent = formatNumber(convertFromBaseUnits(calculatedWeight, massUnit)) + ' ' + massUnit;
intermediateVolumeSpan.textContent = formatNumber(convertFromBaseUnits(calculatedVolume, volumeUnit)) + ' ' + volumeUnit;
intermediateDensitySpan.textContent = formatNumber(calculatedDensity) + ' kg/m³'; // Display in base density unit
} else {
isValid = false;
}
} else if (type === 'volume') {
formula = 'Volume = Weight / Density';
if (baseWeight !== null && baseDensity !== null && baseDensity !== 0) {
calculatedVolume = baseWeight / baseDensity;
mainResult.textContent = formatNumber(convertFromBaseUnits(calculatedVolume, volumeUnit)) + ' ' + volumeUnit;
formulaExplanation.textContent = 'Calculated volume using the formula: V = m / ρ';
calculatedWeight = baseWeight; // Already in kg
calculatedDensity = baseDensity; // Already in kg/m³
intermediateWeightSpan.textContent = formatNumber(convertFromBaseUnits(calculatedWeight, massUnit)) + ' ' + massUnit;
intermediateVolumeSpan.textContent = formatNumber(calculatedVolume) + ' ' + volumeUnit; // Display in selected volume unit
intermediateDensitySpan.textContent = formatNumber(convertFromBaseUnits(calculatedDensity, 'kg/m³')) + ' kg/m³'; // Display in base density unit
} else {
isValid = false;
}
} else if (type === 'weight') {
formula = 'Weight = Density × Volume';
if (baseDensity !== null && baseVolume !== null) {
calculatedWeight = baseDensity * baseVolume;
mainResult.textContent = formatNumber(convertFromBaseUnits(calculatedWeight, massUnit)) + ' ' + massUnit;
formulaExplanation.textContent = 'Calculated weight using the formula: m = ρ × V';
calculatedVolume = baseVolume; // Already in m³
calculatedDensity = baseDensity; // Already in kg/m³
intermediateWeightSpan.textContent = formatNumber(calculatedWeight) + ' ' + massUnit; // Display in selected mass unit
intermediateVolumeSpan.textContent = formatNumber(convertFromBaseUnits(calculatedVolume, volumeUnit)) + ' ' + volumeUnit;
intermediateDensitySpan.textContent = formatNumber(convertFromBaseUnits(calculatedDensity, 'kg/m³')) + ' kg/m³'; // Display in base density unit
} else {
isValid = false;
}
}
}
if (isValid) {
resultsContainer.classList.remove('hidden');
updateChart([calculatedWeight, calculatedVolume, calculatedDensity], massUnit, volumeUnit); // Update chart data
} else {
resultsContainer.classList.add('hidden');
mainResult.textContent = 'Error';
}
}
// Function to update chart data
function updateChart(values, massUnit, volumeUnit) {
// Clear previous chart instance if it exists
if (chart) {
chart.destroy();
}
var calculatedWeight = values[0];
var calculatedVolume = values[1];
var calculatedDensity = values[2];
var labels = [];
var data1 = []; // e.g., Weight
var data2 = []; // e.g., Volume
var densityForChart = calculatedDensity || 1000; // Use calculated or default density for chart generation
var weightForChart = calculatedWeight || 1000; // Use calculated or default weight
var volumeForChart = calculatedVolume || 1; // Use calculated or default volume
// Generate data points for the chart
// Example: Show how weight changes with volume at a constant density
var numPoints = 10;
var minVol = 0.1 * volumeForChart;
var maxVol = 2 * volumeForChart;
var volStep = (maxVol – minVol) / (numPoints – 1);
var minWeight = 0.1 * weightForChart;
var maxWeight = 2 * weightForChart;
var weightStep = (maxWeight – minWeight) / (numPoints – 1);
for (var i = 0; i opt.getAttribute('data-unit-type') === 'volume');
if (volumeOptions.length > 0) {
unitSelect.value = volumeOptions[0].value; // Set to first volume unit found, typically m³
} else {
unitSelect.value = 'm3'; // Fallback if no volume units found
}
updateInputVisibility(); // Update disabled fields and styling
calculateDensityVolumeWeight(); // Recalculate with defaults
}
// Initialize calculator state on page load
document.addEventListener('DOMContentLoaded', function() {
updateInputVisibility();
resetCalculator(); // Set initial defaults and run calculation
// Initial chart generation might need a specific call or be part of reset/calculate
// Let's ensure chart is updated after initial calculation
calculateDensityVolumeWeight();
});
// Event listeners for real-time updates
calculationTypeSelect.addEventListener('change', function() {
updateInputVisibility();
calculateDensityVolumeWeight();
});
weightInput.addEventListener('input', calculateDensityVolumeWeight);
volumeInput.addEventListener('input', calculateDensityVolumeWeight);
densityInput.addEventListener('input', calculateDensityVolumeWeight);
unitSelect.addEventListener('change', calculateDensityVolumeWeight);
// Initial call to set the chart context and prepare it
if (chartCanvas) {
// Initialize chart with placeholder data or defaults
chart = new Chart(chartCanvas, {
type: 'line',
data: {
labels: [],
datasets: [{
label: 'Weight (kg)',
data: [],
borderColor: 'var(–primary-color)',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: true,
tension: 0.1
}, {
label: 'Weight (kg) – Reference',
data: [],
borderColor: 'var(–secondary-color)',
backgroundColor: 'rgba(0, 123, 255, 0.1)',
fill: true,
tension: 0.1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: { beginAtZero: true, title: { display: true, text: 'Weight (kg)' } },
x: { title: { display: true, text: 'Volume' } }
},
plugins: { legend: { position: 'top' }, title: { display: true, text: 'Weight vs. Volume Relationship' } }
}
});
}