Easily convert between mass (weight) and volume for various substances.
Calculator
Water
Motor Oil
Concrete
Sand (Dry)
Custom
Select a common substance or choose 'Custom' to enter your own density.
Density is typically measured in kg/m³ or lb/ft³.
kg/m³
Weight to Volume
Volume to Weight
Enter the weight of the substance.
Enter the volume of the substance.
Results
Results copied!
—
Volume: —
Weight: —
Density: —
Formula Used: Density = Weight / Volume. We rearrange this to solve for the unknown.
Weight vs. Volume Relationship
DensityVolumeWeight
Chart showing how weight changes with volume at a constant density, and how density relates to weight and volume.
Density of Common Materials
Substance
Density (kg/m³)
Density (lb/ft³)
Typical State
Water
997
62.2
Liquid
Motor Oil
870
54.3
Liquid
Concrete
2400
150
Solid
Sand (Dry)
1600
100
Solid
{primary_keyword}
A volume by weight calculator is an indispensable tool used to determine the relationship between the mass (weight) and the volume occupied by a specific substance. This conversion is fundamental across numerous industries, from manufacturing and logistics to construction and scientific research. Essentially, it allows users to translate how much a substance weighs into how much space it takes up, and vice versa, by leveraging the crucial property of density.
This calculator is designed for anyone who needs to understand or quantify the physical properties of materials. This includes:
Engineers and Manufacturers: For material estimation, product design, and process optimization.
Logistics and Shipping Professionals: To calculate cargo space requirements and manage weight restrictions.
Construction Workers and Estimators: For determining the quantity of materials like concrete, sand, or gravel needed for projects.
Scientists and Researchers: In laboratory settings for precise measurements and experimental setups.
Hobbyists and DIY Enthusiasts: For projects involving various materials where precise quantities are needed.
A common misconception about the volume by weight calculator is that it implies a universal conversion factor. However, the key variable is density, which varies significantly between different substances. For example, a cubic meter of feathers weighs far less than a cubic meter of lead, even though both occupy the same volume. Our calculator accounts for this by using the specific density of the selected material or allowing for custom inputs.
{primary_keyword} Formula and Mathematical Explanation
The core principle behind the volume by weight calculator is the definition of density. Density is a measure of mass per unit volume. The fundamental formula is:
Density = Weight / Volume
This formula can be rearranged algebraically to solve for either weight or volume, depending on what information is known and what needs to be calculated. Our calculator performs these rearrangements dynamically.
Derivation Steps:
Starting Formula: Density = Weight / Volume
To find Weight (when Density and Volume are known): Multiply both sides by Volume.
Density * Volume = (Weight / Volume) * Volume Weight = Density * Volume
To find Volume (when Density and Weight are known): Divide both sides by Density.
Density / Density = Weight / (Volume * Density) 1 = Weight / (Volume * Density) Multiply both sides by Volume.
Volume = Weight / Density
Variable Explanations:
Understanding the variables is crucial for accurate calculations:
Variables in Volume by Weight Calculation
Variable
Meaning
Unit (Common Examples)
Typical Range
Density
Mass per unit volume of a substance. It's an intrinsic property of the material.
kg/m³, g/cm³, lb/ft³
~0.001 (Hydrogen gas) to >20,000 (Osmium)
Weight (Mass)
The amount of matter in a substance. Often used interchangeably with mass in practical contexts.
kg, g, lb, tonne
Variable, depends on the amount of substance
Volume
The amount of three-dimensional space occupied by a substance.
m³, cm³, liters (L), ft³, gallons (gal)
Variable, depends on the amount of substance
The consistency of units is paramount. If density is in kg/m³, then weight must be in kg and volume in m³ for the calculation to be valid. Our calculator handles common conversions internally where applicable, but it's always best practice to ensure your inputs are in compatible units.
Practical Examples (Real-World Use Cases)
Let's illustrate the use of the volume by weight calculator with practical scenarios:
Example 1: Construction Material Estimation
A construction manager needs to order dry sand for a foundation project. They know they need approximately 15 cubic meters (m³) of sand. They consult our calculator to determine how much this sand will weigh, which is important for truck capacity planning.
Substance: Sand (Dry)
Density: Approximately 1600 kg/m³
Input: Volume = 15 m³
Calculation Mode: Volume to Weight
Calculator Input: Select 'Sand (Dry)', enter '15' in the Volume field.
Interpretation: The 15 m³ of dry sand will weigh approximately 24,000 kilograms. This information helps in arranging appropriate transportation.
Example 2: Industrial Chemical Handling
A chemical plant receives a shipment of a specific oil. The delivery note states the total weight is 5,000 kilograms (kg). The plant needs to transfer this oil into storage tanks, and they need to know the volume it will occupy to ensure the tank has sufficient capacity.
Substance: Motor Oil (Assumed density)
Density: Approximately 870 kg/m³
Input: Weight = 5,000 kg
Calculation Mode: Weight to Volume
Calculator Input: Select 'Motor Oil', enter '5000' in the Weight field.
Interpretation: The 5,000 kg of motor oil will occupy a volume of approximately 5.75 cubic meters. This ensures the storage tank is adequately sized.
How to Use This {primary_keyword} Calculator
Our user-friendly volume by weight calculator simplifies complex material calculations. Follow these simple steps:
Select Substance Type: Choose from a list of common materials like Water, Motor Oil, Concrete, or Dry Sand. If your material isn't listed, select 'Custom'.
Enter Custom Density (if applicable): If you chose 'Custom', you'll need to input the density of your substance. Ensure you know the density value and its units (e.g., kg/m³ or lb/ft³). The calculator defaults to kg/m³ but is designed to be adaptable.
Choose Calculation Mode: Decide whether you need to calculate Volume from Weight or Weight from Volume.
Input Known Value:
If calculating Volume from Weight, enter the known weight.
If calculating Weight from Volume, enter the known volume.
Ensure the unit of your input matches the expected unit (e.g., kilograms for weight, cubic meters for volume).
View Results: Click the 'Calculate' button. The calculator will display:
Primary Result: The calculated value (either Volume or Weight) in large, highlighted text.
Intermediate Values: The other required input (Weight or Volume) and the Density used in the calculation.
Formula Explanation: A clear statement of the formula applied.
Copy Results: Use the 'Copy Results' button to easily transfer the calculated values and key assumptions to another document or application.
Reset: Click 'Reset' to clear all fields and start a new calculation.
Reading the Results: The primary result clearly shows your calculated value. The intermediate values provide context, confirming the inputs used for density and the other dimension (weight or volume). Always pay attention to the units displayed with the results.
Decision Making: Use the calculated values to make informed decisions regarding material procurement, storage capacity, transportation logistics, and project planning. For instance, if a project requires a certain weight of material, the calculator tells you the volume to expect, helping you gauge storage needs.
Key Factors That Affect {primary_keyword} Results
While the core formulas are straightforward, several real-world factors can influence the accuracy and practical application of volume by weight calculations:
Density Variations: The most significant factor. Density is not always constant. Factors like temperature, pressure (especially for gases), and moisture content can alter it. For example, hot asphalt is less dense than cold asphalt. Always use the density relevant to the specific conditions.
Material Compaction and Packing: For granular materials like sand, gravel, or powders, the way they are packed significantly affects their bulk density. Loose sand will have a lower density (and thus higher volume for a given weight) than compacted sand. Specifications often refer to "loose bulk density" or "compacted bulk density."
Moisture Content: Water adds significant weight. A damp material will weigh more than the same volume of dry material. This is crucial for materials like soil, grain, and construction aggregates.
Temperature Fluctuations: Most substances expand when heated and contract when cooled. This changes their density. While often negligible for solids at typical ambient temperatures, it's critical for liquids and gases over wider temperature ranges.
Impurities and Composition: If a substance is not pure, its density will differ from the pure compound. For example, concrete's density varies based on the mix of cement, aggregate, and water. Ensure you're using the density for the correct mix or composition.
Units of Measurement: A simple but critical factor. Inconsistent units (e.g., using pounds for weight and cubic feet for volume with a density in kg/m³) will lead to incorrect results. Always double-check and ensure all units are compatible before calculation. This is why our calculator emphasizes unit consistency and provides common density conversions.
Measurement Accuracy: The precision of the input measurements (weight or volume) directly impacts the output. Inaccurate scales or volume measuring devices will lead to flawed calculations.
Frequently Asked Questions (FAQ)
Q1: What is the difference between weight and mass in this calculator?
In everyday contexts and for most practical purposes on Earth, weight and mass are used interchangeably. This calculator uses "Weight" to refer to the mass of the substance, typically measured in kilograms (kg) or pounds (lb). The physics definition differentiates them (mass is the amount of matter, weight is the force of gravity on that mass), but for material calculations, the distinction is usually not significant.
Q2: How accurate are the density values provided for common substances?
The density values provided are typical averages for common conditions. Actual density can vary based on factors like temperature, purity, and compaction. For critical applications, always refer to specific material datasheets or perform your own measurements.
Q3: Can I use this calculator for gases?
Yes, but with caution. Gases have densities that are highly sensitive to temperature and pressure. You must ensure you are using the correct density value for the specific conditions (temperature and pressure) under which the gas is being measured. For instance, the density of air changes significantly with altitude and temperature.
Q4: What if my substance is a mixture?
If your substance is a mixture with a known overall density (e.g., a specific concrete mix), you can use that density directly. If you only know the densities of the individual components and their proportions, calculating the mixture's density can be more complex and may require specialized formulas, especially if volume changes upon mixing. For simple additive mixtures where volume is conserved, an average density can sometimes be approximated.
Q5: Does the calculator handle different units for volume and weight?
The calculator's internal calculations assume consistency based on the density units provided (defaulting to kg/m³). While you input weight and volume, their interpretation aligns with the density units. For example, if density is in kg/m³, input weight should be in kg and output volume will be in m³. It's crucial for the user to maintain unit consistency or perform conversions outside the calculator if necessary.
Q6: Why is the "Copy Results" button useful?
The "Copy Results" button saves you time by quickly copying the main calculated result, intermediate values, and key assumptions (like the density used) to your clipboard. This is perfect for pasting into reports, spreadsheets, or other documents without manual transcription.
Q7: How do I input a density in pounds per cubic foot (lb/ft³)?
If you select 'Custom' and know your density in lb/ft³, you can enter that value. However, for consistency with the default units displayed, it is often easier to convert your lb/ft³ value to kg/m³ first (1 lb/ft³ ≈ 16.0185 kg/m³) and then enter it into the custom density field. The helper text under the custom density input will update based on the selected substance type to guide you.
Q8: What is the difference between "Weight" and "Volume" in the calculation modes?
In the context of this calculator, "Weight" refers to the mass (how heavy it is), and "Volume" refers to the space it occupies. The two calculation modes allow you to find one when you know the other and the density:
Weight to Volume: You input the known weight, and the calculator outputs the volume it occupies.
Volume to Weight: You input the known volume, and the calculator outputs the weight it will have.
Related Tools and Internal Resources
Explore these related financial and material calculation tools:
Material Cost Estimator: Calculate the total cost of materials based on quantity and price per unit.
Concrete Calculator: Determine the precise amount of concrete mix needed for various projects.
Paint Calculator: Estimate the amount of paint required for walls and ceilings based on area and coverage rate.
Density Converter: Convert density values between different units (e.g., kg/m³ to lb/ft³).
Bulk Material Calculator: Specialized calculator for estimating weights and volumes of common bulk goods like gravel, soil, and aggregates.
Project Budget Tool: A comprehensive tool for planning and managing project expenses, including material costs.
var substanceData = {
water: { density_kg_m3: 997, density_lb_ft3: 62.2, unit: "kg/m³" },
oil: { density_kg_m3: 870, density_lb_ft3: 54.3, unit: "kg/m³" },
concrete: { density_kg_m3: 2400, density_lb_ft3: 150, unit: "kg/m³" },
sand: { density_kg_m3: 1600, density_lb_ft3: 100, unit: "kg/m³" }
};
var defaultSubstance = "water";
var currentDensityUnit = "kg/m³"; // Tracks the unit being displayed for density
// Chart variables
var volumeWeightChart;
var chartContext;
function updateDensityUnits() {
var selectedSubstance = document.getElementById("substanceType").value;
var densityValueInput = document.getElementById("densityValue");
var densityUnitSpan = document.getElementById("densityUnit");
var customDensityGroup = document.getElementById("customDensityGroup");
var customDensityUnitHelper = document.getElementById("customDensityUnitHelper");
if (selectedSubstance === "custom") {
customDensityGroup.style.display = "block";
densityValueInput.removeAttribute("readonly");
densityValueInput.value = ""; // Clear manual density if switching away from custom
densityUnitSpan.textContent = ""; // Clear unit until custom is entered
densityValueInput.style.display = "none"; // Hide the default density display
document.getElementById("customDensity").value = ""; // Clear custom density input
} else {
customDensityGroup.style.display = "none";
densityValueInput.setAttribute("readonly", true);
var data = substanceData[selectedSubstance];
var densityInKgM3 = data.density_kg_m3;
var densityInLbFt3 = data.density_lb_ft3;
if (currentDensityUnit === "kg/m³") {
densityValueInput.value = densityInKgM3;
densityUnitSpan.textContent = "kg/m³";
} else {
densityValueInput.value = densityInLbFt3;
densityUnitSpan.textContent = "lb/ft³";
}
densityValueInput.style.display = "block"; // Show the default density display
}
// Recalculate if inputs are already set
calculate();
}
function toggleInputFields() {
var mode = document.getElementById("calculationMode").value;
var weightInputGroup = document.getElementById("weightInputGroup");
var volumeInputGroup = document.getElementById("volumeInputGroup");
if (mode === "weightToVolume") {
weightInputGroup.style.display = "block";
volumeInputGroup.style.display = "none";
// Clear the unused input field
document.getElementById("volume").value = "";
document.getElementById("volumeError").style.display = "none";
} else { // volumeToWeight
weightInputGroup.style.display = "none";
volumeInputGroup.style.display = "block";
// Clear the unused input field
document.getElementById("weight").value = "";
document.getElementById("weightError").style.display = "none";
}
// Clear results when mode changes
clearResults();
}
function validateInput(inputElement, minValue, maxValue) {
var value = parseFloat(inputElement.value);
var errorElementId = inputElement.id + "Error";
var errorElement = document.getElementById(errorElementId);
var helperTextElement = document.getElementById(inputElement.id.replace("Input", "Helper")); // Assumes helper text ID is inputID + "Helper"
if (errorElement) {
if (isNaN(value)) {
errorElement.textContent = "Please enter a valid number.";
errorElement.style.display = "block";
if(helperTextElement) helperTextElement.style.display = "none";
return false;
} else if (value maxValue) {
errorElement.textContent = "Value is too high.";
errorElement.style.display = "block";
if(helperTextElement) helperTextElement.style.display = "none";
return false;
} else {
errorElement.style.display = "none";
if(helperTextElement) helperTextElement.style.display = "block";
return true;
}
}
return true; // Return true if no error element found or validation passed
}
function getDensityValue() {
var selectedSubstance = document.getElementById("substanceType").value;
var customDensityInput = document.getElementById("customDensity");
var densityValueInput = document.getElementById("densityValue");
if (selectedSubstance === "custom") {
if (!validateInput(customDensityInput, 0.0001, 100000)) {
return null; // Return null if custom density is invalid
}
// Update the hidden densityValueInput and return its value
densityValueInput.value = customDensityInput.value;
return parseFloat(customDensityInput.value);
} else {
var data = substanceData[selectedSubstance];
if (currentDensityUnit === "kg/m³") {
return data.density_kg_m3;
} else {
return data.density_lb_ft3;
}
}
}
function calculate() {
var mode = document.getElementById("calculationMode").value;
var density = getDensityValue();
if (density === null) { // Handle invalid custom density
clearResults();
return;
}
var primaryResultDisplay = document.getElementById("primaryResult");
var intermediateVolumeDisplay = document.getElementById("intermediateVolume").querySelector("span");
var intermediateWeightDisplay = document.getElementById("intermediateWeight").querySelector("span");
var intermediateDensityDisplay = document.getElementById("intermediateDensity").querySelector("span");
var calculatedValue = null;
var calculatedUnit = "";
var knownValue = null;
var knownUnit = "";
var densityUnitDisplay = document.getElementById("densityUnit").textContent;
if (mode === "weightToVolume") {
var weightInput = document.getElementById("weight");
if (!validateInput(weightInput, 0, Infinity)) {
clearResults();
return;
}
knownValue = parseFloat(weightInput.value);
knownUnit = "kg"; // Assuming kg based on density unit
if (densityUnitDisplay.includes("lb/ft³")) {
knownUnit = "lb";
}
calculatedValue = knownValue / density;
calculatedUnit = "m³"; // Assuming m³ based on density unit
if (densityUnitDisplay.includes("lb/ft³")) {
calculatedUnit = "ft³";
}
primaryResultDisplay.textContent = calculatedValue.toFixed(3) + " " + calculatedUnit;
intermediateVolumeDisplay.textContent = "–"; // This is the result, not intermediate
intermediateWeightDisplay.textContent = knownValue.toFixed(3) + " " + knownUnit;
intermediateDensityDisplay.textContent = density.toFixed(2) + " " + densityUnitDisplay;
} else { // volumeToWeight
var volumeInput = document.getElementById("volume");
if (!validateInput(volumeInput, 0, Infinity)) {
clearResults();
return;
}
knownValue = parseFloat(volumeInput.value);
knownUnit = "m³"; // Assuming m³ based on density unit
if (densityUnitDisplay.includes("lb/ft³")) {
knownUnit = "ft³";
}
calculatedValue = knownValue * density;
calculatedUnit = "kg"; // Assuming kg based on density unit
if (densityUnitDisplay.includes("lb/ft³")) {
calculatedUnit = "lb";
}
primaryResultDisplay.textContent = calculatedValue.toFixed(3) + " " + calculatedUnit;
intermediateWeightDisplay.textContent = "–"; // This is the result, not intermediate
intermediateVolumeDisplay.textContent = knownValue.toFixed(3) + " " + knownUnit;
intermediateDensityDisplay.textContent = density.toFixed(2) + " " + densityUnitDisplay;
}
// Update the "other" intermediate result for clarity
if (mode === "weightToVolume") {
intermediateVolumeDisplay.textContent = calculatedValue.toFixed(3) + " " + calculatedUnit;
intermediateWeightDisplay.textContent = knownValue.toFixed(3) + " " + knownUnit;
} else {
intermediateWeightDisplay.textContent = calculatedValue.toFixed(3) + " " + knownUnit;
intermediateVolumeDisplay.textContent = knownValue.toFixed(3) + " " + densityUnitDisplay.replace("/m³","/ft³").replace("/ft³","/m³"); // Adjust density unit display if needed
intermediateDensityDisplay.textContent = density.toFixed(2) + " " + densityUnitDisplay;
}
updateChart();
}
function clearResults() {
document.getElementById("primaryResult").textContent = "–";
document.getElementById("intermediateVolume").querySelector("span").textContent = "–";
document.getElementById("intermediateWeight").querySelector("span").textContent = "–";
document.getElementById("intermediateDensity").querySelector("span").textContent = "–";
if (chartContext) {
chartContext.clearRect(0, 0, volumeWeightChart.width, volumeWeightChart.height);
}
// Clear input fields when results are cleared, maybe not needed if only reset does that
// document.getElementById("weight").value = "";
// document.getElementById("volume").value = "";
// document.getElementById("customDensity").value = "";
}
function resetCalculator() {
document.getElementById("substanceType").value = defaultSubstance;
document.getElementById("calculationMode").value = "weightToVolume";
document.getElementById("weight").value = "";
document.getElementById("volume").value = "";
document.getElementById("customDensity").value = "";
document.getElementById("densityValue").value = "";
document.getElementById("densityUnit").textContent = "kg/m³"; // Reset to default unit
// Reset display styles
document.getElementById("weightInputGroup").style.display = "block";
document.getElementById("volumeInputGroup").style.display = "none";
document.getElementById("customDensityGroup").style.display = "none";
// Reset error messages
var errorElements = document.querySelectorAll('.error-message');
for (var i = 0; i < errorElements.length; i++) {
errorElements[i].style.display = "none";
}
clearResults();
updateDensityUnits(); // Reapply default substance density and units
}
function copyResults() {
var primaryResult = document.getElementById("primaryResult").textContent;
var intermediateVolume = document.getElementById("intermediateVolume").textContent;
var intermediateWeight = document.getElementById("intermediateWeight").textContent;
var intermediateDensity = document.getElementById("intermediateDensity").textContent;
var mode = document.getElementById("calculationMode").value;
var densityUnit = document.getElementById("densityUnit").textContent;
var densityValue = document.getElementById("densityValue").value;
var copyText = "— Volume by Weight Calculation Results —\n\n";
copyText += "Mode: " + (mode === "weightToVolume" ? "Weight to Volume" : "Volume to Weight") + "\n";
copyText += "Density Used: " + densityValue + " " + densityUnit + "\n";
copyText += "—————————————–\n";
copyText += "Primary Result: " + primaryResult + "\n";
copyText += intermediateVolume + "\n";
copyText += intermediateWeight + "\n";
copyText += intermediateDensity + "\n";
copyText += "—————————————–\n";
copyText += "Formula: Density = Weight / Volume\n";
// Use a temporary textarea for copying
var textArea = document.createElement("textarea");
textArea.value = copyText;
textArea.style.position = "fixed";
textArea.style.opacity = "0";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Results copied!' : 'Copying failed';
var copiedMessage = document.getElementById("copied-message");
copiedMessage.textContent = msg;
copiedMessage.style.display = "block";
setTimeout(function(){ copiedMessage.style.display = "none"; }, 3000);
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
var copiedMessage = document.getElementById("copied-message");
copiedMessage.textContent = 'Copying failed';
copiedMessage.style.display = "block";
setTimeout(function(){ copiedMessage.style.display = "none"; }, 3000);
}
document.body.removeChild(textArea);
}
function initChart() {
var canvas = document.getElementById('volumeWeightChart');
chartContext = canvas.getContext('2d');
volumeWeightChart = new Chart(chartContext, {
type: 'line', // Changed to line chart for better visualization of ranges
data: {
labels: [], // Will be populated dynamically
datasets: [{
label: 'Weight (kg)',
data: [],
borderColor: 'rgba(40, 167, 69, 1)', // Green for weight
backgroundColor: 'rgba(40, 167, 69, 0.2)',
fill: false,
tension: 0.1,
yAxisID: 'y-weight'
}, {
label: 'Volume (m³)',
data: [],
borderColor: 'rgba(255, 193, 7, 1)', // Yellow for volume
backgroundColor: 'rgba(255, 193, 7, 0.2)',
fill: false,
tension: 0.1,
yAxisID: 'y-volume'
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Volume (m³)'
}
},
y-weight: {
type: 'linear',
position: 'left',
title: {
display: true,
text: 'Weight (kg)'
},
ticks: {
beginAtZero: true
}
},
y-volume: {
type: 'linear',
position: 'right',
title: {
display: true,
text: 'Volume (m³)'
},
ticks: {
beginAtZero: true
}
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y + (context.dataset.label.includes('Weight') ? ' kg' : ' m³');
}
return label;
}
}
}
}
}
});
}
function updateChart() {
if (!volumeWeightChart) {
initChart();
}
var density = getDensityValue();
var mode = document.getElementById("calculationMode").value;
var densityUnit = document.getElementById("densityUnit").textContent;
var volumeUnit = densityUnit.includes("lb/ft³") ? "ft³" : "m³";
var weightUnit = densityUnit.includes("lb/ft³") ? "lb" : "kg";
var chartDataSets = volumeWeightChart.data.datasets;
var chartLabels = [];
var weightData = [];
var volumeData = [];
// Determine range for chart based on current input and potential values
var maxRange = 100; // Default max for the primary axis
var knownValue = 0;
if (mode === "weightToVolume") {
var weightInput = document.getElementById("weight");
if (weightInput.value && !isNaN(parseFloat(weightInput.value))) {
knownValue = parseFloat(weightInput.value);
// Calculate volume for the current weight
var calculatedVolume = knownValue / density;
// Set chart range based on current input and some buffer
maxRange = Math.max(100, calculatedVolume * 1.5);
}
chartDataSets[0].label = 'Weight (' + weightUnit + ')'; // Update label based on unit
chartDataSets[1].label = 'Volume (' + volumeUnit + ')'; // Update label
volumeWeightChart.options.scales['x'].title.text = 'Volume (' + volumeUnit + ')';
volumeWeightChart.options.scales['y-weight'].title.text = 'Weight (' + weightUnit + ')';
volumeWeightChart.options.scales['y-volume'].title.text = 'Volume (' + volumeUnit + ')';
// Populate chart data for a range of volumes to show weight variation
var step = maxRange / 10;
for (var i = 0; i <= 10; i++) {
var currentVolume = step * i;
var currentWeight = currentVolume * density;
chartLabels.push(currentVolume.toFixed(1));
weightData.push(currentWeight.toFixed(1));
volumeData.push(currentVolume.toFixed(1)); // Volume is the x-axis, but also shown on y-axis for comparison
}
} else { // volumeToWeight
var volumeInput = document.getElementById("volume");
if (volumeInput.value && !isNaN(parseFloat(volumeInput.value))) {
knownValue = parseFloat(volumeInput.value);
// Calculate weight for the current volume
var calculatedWeight = knownValue * density;
// Set chart range based on current input and some buffer
maxRange = Math.max(100, knownValue * 1.5);
}
chartDataSets[0].label = 'Weight (' + weightUnit + ')'; // Update label based on unit
chartDataSets[1].label = 'Volume (' + volumeUnit + ')'; // Update label
volumeWeightChart.options.scales['x'].title.text = 'Volume (' + volumeUnit + ')';
volumeWeightChart.options.scales['y-weight'].title.text = 'Weight (' + weightUnit + ')';
volumeWeightChart.options.scales['y-volume'].title.text = 'Volume (' + volumeUnit + ')';
// Populate chart data for a range of volumes to show weight variation
var step = maxRange / 10;
for (var i = 0; i <= 10; i++) {
var currentVolume = step * i;
var currentWeight = currentVolume * density;
chartLabels.push(currentVolume.toFixed(1));
weightData.push(currentWeight.toFixed(1));
volumeData.push(currentVolume.toFixed(1)); // Volume is the x-axis, but also shown on y-axis for comparison
}
}
// Update chart datasets
chartDataSets[0].data = weightData;
chartDataSets[1].data = volumeData; // Using volume data for the volume series on the right y-axis
volumeWeightChart.data.labels = chartLabels;
// Adjust y-axis maximums dynamically
var maxWeight = Math.max(…weightData.map(Number));
var maxVolume = Math.max(…volumeData.map(Number));
volumeWeightChart.options.scales['y-weight'].max = maxWeight * 1.1; // Add 10% buffer
volumeWeightChart.options.scales['y-volume'].max = maxVolume * 1.1; // Add 10% buffer
volumeWeightChart.update();
}
// Toggle FAQ answers
function toggleFaq(header) {
var answer = header.nextElementSibling;
if (answer.style.display === "block") {
answer.style.display = "none";
} else {
answer.style.display = "block";
}
}
// Initialize calculator on load
document.addEventListener('DOMContentLoaded', function() {
resetCalculator(); // Set default values and display
initChart(); // Initialize chart
updateChart(); // Initial chart update
});