.calculator-wrapper {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-wrapper h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.calculator-inputs {
margin-bottom: 20px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.form-group input {
width: calc(100% – 12px);
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
button {
width: 100%;
padding: 10px 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 20px;
padding: 10px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
}
function calculateTonnage() {
var weightKgInput = document.getElementById("weightInKg");
var densityKgPerCubicMeterInput = document.getElementById("densityInKgPerCubicMeter");
var resultDiv = document.getElementById("result");
var weightKg = parseFloat(weightKgInput.value);
var densityKgPerCubicMeter = parseFloat(densityKgPerCubicMeterInput.value);
if (isNaN(weightKg) || isNaN(densityKgPerCubicMeter)) {
resultDiv.innerHTML = "Please enter valid numbers for both fields.";
return;
}
if (densityKgPerCubicMeter <= 0) {
resultDiv.innerHTML = "Density must be a positive value.";
return;
}
// Tonnage is often a unit of weight, not derived from density and volume directly in a simple formula
// However, if the intent is to find the VOLUME that *would weigh* a certain amount if it had a given density,
// we can calculate Volume = Weight / Density.
// If 'tonnage' is meant as a measure of VOLUME capacity, and we are given weight and density,
// we can calculate the volume.
// Let's assume 'tonnage' here refers to the VOLUME occupied by the given weight at the given density.
// 1 Tonne = 1000 kg. If we want the result in tonnes (metric tons) of volume capacity.
var volumeInCubicMeters = weightKg / densityKgPerCubicMeter;
var volumeInTonnes = volumeInCubicMeters / 1000; // Assuming "tonnage" refers to metric tons capacity
resultDiv.innerHTML = "Volume Capacity: " + volumeInCubicMeters.toFixed(2) + " m³" +
"Tonnage (Metric Tons): " + volumeInTonnes.toFixed(2) + " t";
}
Understanding Tonnage Calculation
Tonnage, in its most common context within shipping and logistics, refers to the carrying capacity of a vessel or vehicle, often measured in metric tons (tonnes). It is a measure of weight. However, in some engineering or material science contexts, you might encounter calculations that involve determining the volume occupied by a certain weight of a substance given its density, or vice versa.
The calculator above helps determine the volume capacity a given weight would occupy, assuming a uniform density. This can be useful for understanding how much space a certain amount of material will take up, and subsequently, how many standard units of weight (like metric tons) that volume represents.
The formula used is derived from the fundamental relationship between mass, density, and volume:
Rearranging this formula to find volume:
In our calculator:
- Weight (kg) represents the mass.
- Density (kg/m³) represents the mass per unit volume of the substance.
- The calculated Volume (m³) is the space the material occupies.
- The final Tonnage (Metric Tons) is derived by converting the calculated volume's equivalent mass in kilograms to metric tons (1 metric ton = 1000 kg). This assumes the input 'weight in kg' is the total mass, and we're expressing its capacity in tonnes.
Example Usage:
Imagine you have a load of bulk sand that weighs 15,000 kg. The average density of this type of sand is approximately 1,600 kg/m³. To find out how much volume this sand occupies and its tonnage capacity:
- Enter 15000 for "Weight (kg)".
- Enter 1600 for "Density (kg/m³)".
The calculator will output:
- Volume Capacity: 9.38 m³ (15000 kg / 1600 kg/m³ = 9.375 m³)
- Tonnage (Metric Tons): 9.38 t (9375 kg / 1000 kg/tonne = 9.375 tonnes)
This means 15,000 kg of sand with a density of 1,600 kg/m³ occupies a volume of 9.38 cubic meters, which is equivalent to 9.38 metric tons of capacity.