Construction Steel Weight Calculation
Calculate the precise weight of steel required for your construction projects. Use our comprehensive tool for accurate material estimation.
Steel Weight Calculator
Mild Steel
Stainless Steel
Cast Iron
Wrought Iron
Select the type of steel. This affects its density.
Bar
Pipe
Plate
Angle
Beam (I-Beam)
Choose the geometric shape of the steel.
Enter the total length of the steel component in meters.
Calculation Results
— kg
—
Density (kg/m³)
—
Volume (m³)
—
Surface Area (m²)
Weight = Density × Volume
Weight Distribution by Steel Type
Mild Steel
Stainless Steel
Cast Iron
Wrought Iron
| Property | Value | Unit |
|---|---|---|
| Selected Steel Type | – | |
| Selected Steel Shape | – | |
| Density | kg/m³ | |
| Length | m | |
| Dimension 1 | ||
| Dimension 2 (if applicable) | ||
| Calculated Volume | m³ | |
| Calculated Weight | kg |
What is Construction Steel Weight Calculation?
Construction steel weight calculation is the process of determining the total mass of steel components required for a building or infrastructure project. This involves understanding the physical properties of steel, such as its density, and the geometry of the steel elements being used (e.g., bars, beams, plates). Accurate steel weight calculation is a cornerstone of efficient construction project management. It directly impacts material procurement, cost estimation, structural integrity, and logistical planning. By precisely calculating the steel weight, engineers and contractors can avoid over-ordering expensive materials, minimize waste, ensure structural designs are met with the correct steel quantities, and plan for the transportation and handling of heavy materials. It's a fundamental step in both the design and execution phases of any construction endeavor involving steel.
Who should use it?
- Structural Engineers: For designing the framework and ensuring load-bearing capacities.
- Architects: For conceptualizing and detailing structural elements.
- Quantity Surveyors and Estimators: For preparing project budgets and material lists.
- Procurement Managers: For ordering the exact amount of steel needed.
- Construction Site Managers: For logistics, handling, and inventory control.
- Fabricators: For planning cutting, welding, and assembly processes.
Common misconceptions about construction steel weight calculation include:
- Assuming all steel has the same density: Different steel alloys and types (mild steel, stainless steel, etc.) have slightly different densities, impacting the final weight.
- Underestimating the impact of shape on weight: While length is a primary factor, the cross-sectional shape (bar, I-beam, plate) significantly influences volume and thus weight.
- Ignoring wastage: Projects often require slightly more steel than the theoretical calculated weight due to offcuts, errors, or specific project requirements. While this calculator provides theoretical weight, practical estimates should factor in wastage.
- Thinking it's only about cost: Steel weight is also critical for structural stability, seismic resistance, and load-bearing capacity.
Construction Steel Weight Calculation Formula and Mathematical Explanation
The fundamental principle behind construction steel weight calculation is derived from basic physics: Weight = Density × Volume. To calculate the weight of steel, we need to determine its density and the volume it occupies. The density of steel is a material property, while the volume depends on the shape and dimensions of the steel element.
Step-by-Step Derivation:
- Identify Steel Type and Density: Different types of steel have varying densities. For example, standard mild steel has a density of approximately 7850 kg/m³. Stainless steel might be slightly higher, around 7900-8000 kg/m³. This value is crucial and is often a standard reference.
- Determine Steel Shape and Dimensions: The shape of the steel element (e.g., a round bar, a square section, an I-beam, or a flat plate) dictates how its volume is calculated.
- Calculate Volume (V): The formula for volume varies based on the shape:
- For a Bar/Rod (Cylindrical): V = π × (radius)² × length = π × (diameter/2)² × length
- For a Rectangular Bar/Plate: V = width × thickness × length
- For an I-Beam: Volume calculation is more complex, often involving calculating the volume of its constituent parts (flanges and web) or using pre-defined section properties that account for volume per unit length. For simplicity in a general calculator, we often approximate or use standard formulas. A common approximation might be based on the area of the cross-section multiplied by the length.
- For a Pipe: V = π × ((outer_radius)² – (inner_radius)²) × length = π × ((outer_diameter/2)² – (inner_diameter/2)²) × length
- For an Angle Section: Similar to I-beams, it's calculated based on its specific cross-sectional geometry.
- Calculate Weight (W): Once density (ρ) and volume (V) are known, the weight is calculated:
W = ρ × V
Where:- W is the weight in kilograms (kg).
- ρ (rho) is the density of the steel in kilograms per cubic meter (kg/m³).
- V is the volume in cubic meters (m³).
Variable Explanations:
| Variable | Meaning | Unit | Typical Range / Notes |
|---|---|---|---|
| ρ (Density) | Mass per unit volume of the steel material. | kg/m³ | Mild Steel: ~7850; Stainless Steel: ~7900-8000; Cast Iron: ~7200; Wrought Iron: ~7700 |
| L (Length) | The overall length of the steel element. | meters (m) | Typically positive, e.g., 1 to 100+ m for structural components. |
| D (Diameter) | The diameter of a circular cross-section (bar, pipe). | millimeters (mm) or meters (m) | e.g., 10 mm to 100 mm (0.01 m to 0.1 m) for bars. |
| d (Thickness) | The thickness of a plate or flat bar. | millimeters (mm) or meters (m) | e.g., 5 mm to 50 mm (0.005 m to 0.05 m). |
| w (Width) | The width of a rectangular bar or plate. | millimeters (mm) or meters (m) | e.g., 20 mm to 200 mm (0.02 m to 0.2 m). |
| OD (Outer Diameter) | The external diameter of a pipe. | millimeters (mm) or meters (m) | e.g., 25 mm to 300 mm (0.025 m to 0.3 m). |
| ID (Inner Diameter) | The internal diameter of a pipe. | millimeters (mm) or meters (m) | Must be less than OD. e.g., 20 mm to 280 mm (0.02 m to 0.28 m). |
| V (Volume) | The total space occupied by the steel element. | cubic meters (m³) | Calculated based on shape and dimensions. |
| W (Weight) | The total mass of the steel element. | kilograms (kg) | The primary output of the calculation. |
| A (Cross-sectional Area) | The area of the steel's cross-section. | square meters (m²) | Calculated based on shape and dimensions. Used in beam/angle calcs. |
Practical Examples (Real-World Use Cases)
Accurate construction steel weight calculation is vital for project success. Here are two practical examples:
Example 1: Calculating the Weight of Steel Rebar for a Concrete Column
Scenario: A structural engineer needs to specify the steel reinforcement for a reinforced concrete column. They've chosen to use 16 mm diameter mild steel bars (rebar).
Inputs:
- Steel Type: Mild Steel
- Steel Shape: Bar (Round)
- Diameter: 16 mm (converted to 0.016 m)
- Length: 5 meters per bar (assuming 4 bars per column, total length = 4 * 5m = 20m)
Calculation Steps:
- Density (Mild Steel): ρ = 7850 kg/m³
- Radius: r = Diameter / 2 = 0.016 m / 2 = 0.008 m
- Volume (Bar): V = π × r² × Length = π × (0.008 m)² × 20 m
- V ≈ 3.14159 × 0.000064 m² × 20 m ≈ 0.00402 m³
- Weight: W = ρ × V = 7850 kg/m³ × 0.00402 m³
- W ≈ 31.58 kg
Interpretation: The total weight of the four 16 mm rebar pieces, each 5 meters long, required for this column is approximately 31.58 kg. This figure is crucial for the steel fabricator to order the correct amount of rebar and for the construction team to manage the material on site.
Example 2: Calculating the Weight of a Steel Plate for a Foundation Base
Scenario: A contractor needs to fabricate a steel base plate for a heavy structural support. The specifications call for a rectangular plate made of a specific grade of steel.
Inputs:
- Steel Type: Stainless Steel (e.g., Grade 304)
- Steel Shape: Plate (Rectangular)
- Width: 500 mm (converted to 0.5 m)
- Thickness: 10 mm (converted to 0.01 m)
- Length: 1.5 meters
Calculation Steps:
- Density (Stainless Steel): ρ ≈ 7950 kg/m³ (This value can vary slightly by grade)
- Volume (Plate): V = Width × Thickness × Length = 0.5 m × 0.01 m × 1.5 m
- V = 0.0075 m³
- Weight: W = ρ × V = 7950 kg/m³ × 0.0075 m³
- W ≈ 59.63 kg
Interpretation: The calculated weight for the stainless steel base plate is approximately 59.63 kg. This helps in confirming the structural suitability of the plate thickness and in planning for handling and installation, as well as in accurate project costing. This aligns with understanding the steel material properties.
How to Use This Construction Steel Weight Calculator
Our online construction steel weight calculator is designed for ease of use, providing quick and accurate results for your steel material estimations.
Step-by-Step Instructions:
- Select Steel Type: Choose the specific type of steel from the dropdown menu (e.g., Mild Steel, Stainless Steel). Each type has a different density which affects the final weight.
- Select Steel Shape: Choose the geometric shape of your steel component (e.g., Bar, Pipe, Plate, Angle, Beam).
- Input Dimensions: Based on the selected shape, you will be prompted to enter specific dimensions.
- For Bar: Enter the Diameter and Length.
- For Pipe: Enter the Outer Diameter, Inner Diameter (or Wall Thickness), and Length.
- For Plate: Enter the Width, Thickness, and Length.
- For Angle/Beam: Enter the relevant dimensions (e.g., leg length, thickness for angle; flange width, web height, thickness for beam) and Length. *Note: For complex shapes like beams, the calculator uses standard approximations or simplified models.*
- Enter Overall Length: Input the total length of the steel component in meters.
- Calculate: Click the "Calculate Weight" button.
How to Read Results:
- Primary Result (Main Highlighted Box): This shows the total calculated weight of the steel component in kilograms (kg).
- Intermediate Results:
- Density: Displays the density (kg/m³) of the selected steel type.
- Volume: Shows the calculated volume (m³) of the steel component.
- Surface Area: (If applicable and calculated) Shows the surface area in square meters (m²). This can be useful for coatings or treatments.
- Formula Explanation: A brief reminder of the core formula: Weight = Density × Volume.
- Variables Table: Provides a detailed breakdown of all input values, units, and calculated properties, serving as a confirmation of your inputs and the calculator's outputs.
- Chart: Visualizes how the weight compares across different standard steel types for a given basic shape (e.g., a 1m bar of 20mm diameter).
Decision-Making Guidance:
- Procurement: Use the calculated weight to order the precise quantity of steel needed, minimizing overstock and waste. Factor in a small percentage (e.g., 5-10%) for wastage in your actual order.
- Budgeting: Multiply the calculated weight by the current market price per kilogram of the specific steel type to estimate material costs.
- Logistics: The weight is crucial for planning transportation, lifting equipment, and site storage.
- Structural Design: Ensure the calculated weight aligns with the structural engineer's load calculations and specifications.
Don't forget to use the "Reset" button to clear all fields and start a new calculation, or the "Copy Results" button to easily transfer the data for your reports.
Key Factors That Affect Construction Steel Weight Results
Several factors influence the calculated construction steel weight. Understanding these helps in refining estimates and making informed decisions:
-
Steel Type and Alloy Composition:
This is the most direct factor. Different steel alloys (mild steel, carbon steel, stainless steel, alloy steel) have distinct chemical compositions, leading to variations in their density. For instance, stainless steel, containing chromium and nickel, is typically slightly denser than standard mild steel. Minor variations in carbon content within mild steel can also subtly affect density.
-
Geometric Shape and Dimensions:
The shape of the steel element (bar, beam, plate, pipe, angle) is paramount. A solid bar of a certain length will weigh differently than a hollow pipe or an I-beam with the same overall length and similar material. The cross-sectional area and how efficiently that area is distributed (e.g., an I-beam uses material strategically for strength) directly determine the volume. Precision in measuring or specifying dimensions (diameter, width, thickness, height) is critical.
-
Manufacturing Tolerances:
Steel products are manufactured to specific standards, but there are always acceptable tolerances in dimensions and weight. For example, a steel bar might be manufactured to be slightly larger or smaller than its nominal diameter within a specified range. While often minor, these tolerances can lead to slight deviations in the actual weight compared to the theoretical calculation. For critical applications, engineers specify tighter tolerances.
-
Length of the Component:
This is a straightforward multiplier. Longer steel components naturally weigh more than shorter ones, assuming all other factors (shape, dimensions, material) remain constant. Accurate measurement or specification of the required length is essential.
-
Internal Structure and Hollow Sections:
The presence of internal voids or hollow sections significantly reduces weight. A steel pipe, for example, weighs considerably less than a solid steel bar with the same outer diameter and length because the material in the hollow core is absent. The wall thickness of pipes or the web depth of beams are critical parameters here.
-
Wastage and Offcuts:
In practical construction, it's rare to use every single millimeter of purchased steel. Cutting processes generate offcuts, and errors can lead to scrapped pieces. Therefore, the actual steel *procured* will always be more than the theoretically calculated weight. A wastage factor (typically 5-15%) is commonly added to the calculated weight for procurement purposes.
-
Surface Treatments and Coatings:
While usually a minor factor for total weight, if steel components are to be coated (e.g., galvanized, painted), the weight of the coating material adds incrementally to the total mass. For large projects or very heavy coatings, this could become a consideration.
Frequently Asked Questions (FAQ) about Construction Steel Weight
Q1: What is the standard density of mild steel used in construction?
A1: The standard density of mild steel is approximately 7850 kilograms per cubic meter (kg/m³). This value is widely used in construction calculations.
Q2: Does the shape of the steel affect its weight?
A2: Absolutely. While the density of the material remains constant, the shape dictates the volume occupied by the steel. For example, an I-beam has a different volume and weight compared to a solid bar of the same length and outer dimensions because of its optimized cross-section.
Q3: How do I convert millimeters (mm) to meters (m) for calculations?
A3: To convert millimeters to meters, divide the value by 1000. For example, 50 mm is equal to 50 / 1000 = 0.05 meters. Our calculator handles these conversions internally if you input dimensions in mm.
Q4: Is it better to overestimate or underestimate steel weight for ordering?
A4: It is generally better to slightly overestimate the required steel weight for ordering. Underestimating can lead to project delays and increased costs due to emergency material purchases. However, a massive overestimate leads to unnecessary expenditure and potential waste. Factor in a reasonable wastage percentage (e.g., 5-10%) for accurate procurement.
Q5: Can I calculate the weight of custom steel profiles?
A5: This calculator provides options for common shapes like bars, pipes, plates, angles, and beams. For highly custom or complex profiles, you may need specialized software or to break down the profile into simpler geometric shapes to calculate the volume manually or consult with a steel fabricator.
Q6: What is the difference between weight and mass in this context?
A6: In practical engineering and construction, the terms 'mass' and 'weight' are often used interchangeably when referring to steel quantity in kilograms. Technically, mass is the amount of matter, while weight is the force of gravity on that mass. For material calculation purposes in construction, we are essentially calculating the mass, expressed in kilograms (kg).
Q7: How does surface area relate to steel weight calculation?
A7: Surface area is not directly used in the primary weight calculation (Weight = Density × Volume). However, it's an important related metric for applications like calculating the amount of paint, protective coatings, or galvanization required, which can add a small amount to the total delivered weight.
Q8: Can this calculator be used for structural steel beams (like I-beams or H-beams)?
A8: Yes, the calculator includes an option for 'Beam (I-Beam)'. It uses standard formulas or approximations based on common beam dimensions (flange width, web height, flange thickness, web thickness) to estimate the volume and weight. For highly specific or non-standard beam profiles, detailed engineering drawings and calculations might be necessary.
Related Tools and Internal Resources
- Structural Load Calculator Estimate the loads a structure needs to support, crucial for determining steel requirements.
- Concrete Volume Calculator Calculate the amount of concrete needed for foundations, slabs, and columns, often used in conjunction with steel rebar calculations.
- Material Cost Estimator Get an estimate of the total material costs for your construction project, including steel.
- Bolt Strength Calculator Determine the load-bearing capacity of various bolt types used in steel connections.
- Steel Grade Comparison Chart Understand the properties and applications of different steel grades.
- Construction Project Budget Template Download a template to help manage your project's financial planning, including material costs.
Enter diameter in millimeters (mm).
`;
break;
case 'pipe':
html += `
Enter outer diameter in millimeters (mm).
Enter inner diameter in millimeters (mm). Must be less than outer diameter.
`;
break;
case 'plate':
html += `
Enter width in millimeters (mm).
Enter thickness in millimeters (mm).
`;
break;
case 'angle':
html += `
Enter length of the first leg in millimeters (mm).
Enter length of the second leg in millimeters (mm).
Enter thickness in millimeters (mm).
`;
break;
case 'beam':
html += `
Enter flange width in millimeters (mm).
Enter web height in millimeters (mm).
Enter flange thickness in millimeters (mm).
Enter web thickness in millimeters (mm).
`;
break;
}
inputContainer.innerHTML = html;
updateTableValues(); // Update table with new shape specific inputs
calculateSteelWeight(); // Recalculate after changing inputs
updateChartData(); // Update chart to reflect potential changes in dimensions
}
function validateInput(input) {
var errorElementId = input.id + 'Error';
var errorElement = document.getElementById(errorElementId);
if (!errorElement) return; // No error element found for this input
var value = parseFloat(input.value);
var isEmpty = input.value.trim() === ";
var isNegative = value < 0;
var isValid = true;
// Specific validation rules
if (input.id === 'length' && (value < 0.01 || isEmpty)) isValid = false;
if (input.id === 'barDiameter' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'pipeOuterDiameter' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'pipeInnerDiameter' && (value = outerDiameter) {
isValid = false;
errorElement.textContent = "Inner diameter must be less than outer diameter.";
}
}
if (input.id === 'plateWidth' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'plateThickness' && (value < 0.1 || isEmpty)) isValid = false;
if (input.id === 'angleLeg1' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'angleLeg2' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'angleThickness' && (value < 0.1 || isEmpty)) isValid = false;
if (input.id === 'beamFlangeWidth' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'beamWebHeight' && (value < 1 || isEmpty)) isValid = false;
if (input.id === 'beamFlangeThickness' && (value < 0.1 || isEmpty)) isValid = false;
if (input.id === 'beamWebThickness' && (value < 0.1 || isEmpty)) isValid = false;
if (isEmpty) {
errorElement.textContent = "This field cannot be empty.";
errorElement.style.display = 'block';
isValid = false;
} else if (isNegative) {
errorElement.textContent = "This value cannot be negative.";
errorElement.style.display = 'block';
isValid = false;
} else if (!isValid) {
// Generic error message if specific checks failed but not empty/negative
if (input.id === 'pipeInnerDiameter' && value = parseFloat(outerDiameterInput.value)) {
document.getElementById('pipeInnerDiameterError').textContent = "Inner diameter must be less than outer diameter.";
document.getElementById('pipeInnerDiameterError').style.display = 'block';
allValid = false;
}
}
return allValid;
}
function calculateSteelWeight() {
if (!validateAllInputs()) {
// Clear results if validation fails
document.getElementById('mainResult').textContent = '– kg';
document.getElementById('intermediateDensity').textContent = '–';
document.getElementById('intermediateVolume').textContent = '–';
document.getElementById('intermediateSurfaceArea').textContent = '–';
updateTableValues(); // Clear table too
return;
}
var steelType = document.getElementById('steelType').value;
var shape = document.getElementById('shape').value;
var length = parseFloat(document.getElementById('length').value);
var density = densities[steelType] || 7850;
var volume = 0;
var surfaceArea = 0; // Initialize surface area
var dim1 = 0, dim2 = 0, unit1 = ", unit2 = ";
switch (shape) {
case 'bar':
var diameter = parseFloat(document.getElementById('barDiameter').value);
dim1 = diameter; unit1 = 'mm';
var radius = diameter / 2000; // mm to meters
volume = Math.PI * radius * radius * length;
surfaceArea = (Math.PI * diameter / 1000 * length) + 2 * (Math.PI * radius * radius); // Circumference * length + 2 * end cap area
break;
case 'pipe':
var outerDiameter = parseFloat(document.getElementById('pipeOuterDiameter').value);
var innerDiameter = parseFloat(document.getElementById('pipeInnerDiameter').value);
dim1 = outerDiameter; unit1 = 'mm (OD)';
dim2 = innerDiameter; unit2 = 'mm (ID)';
var outerRadius = outerDiameter / 2000;
var innerRadius = innerDiameter / 2000;
volume = Math.PI * (Math.pow(outerRadius, 2) – Math.pow(innerRadius, 2)) * length;
surfaceArea = (Math.PI * outerDiameter / 1000 * length) + (Math.PI * innerDiameter / 1000 * length) + 2 * (Math.PI * (outerRadius * outerRadius – innerRadius * innerRadius)); // Outer surf + inner surf + 2 end caps
break;
case 'plate':
var width = parseFloat(document.getElementById('plateWidth').value);
var thickness = parseFloat(document.getElementById('plateThickness').value);
dim1 = width; unit1 = 'mm';
dim2 = thickness; unit2 = 'mm';
volume = (width / 1000) * (thickness / 1000) * length;
surfaceArea = 2 * ((width/1000 * length) + (thickness/1000 * length)) + 2 * (width/1000 * thickness/1000); // Top + Bottom + Sides
break;
case 'angle':
var leg1 = parseFloat(document.getElementById('angleLeg1').value);
var leg2 = parseFloat(document.getElementById('angleLeg2').value);
var thickness = parseFloat(document.getElementById('angleThickness').value);
dim1 = leg1; unit1 = 'mm';
dim2 = leg2; unit2 = 'mm';
// Calculate area of angle iron cross-section
// Area = (leg1 * thickness) + (leg2 * thickness) – (thickness * thickness) to avoid double counting the corner
var area = ((leg1 / 1000) * (thickness / 1000)) + ((leg2 / 1000) * (thickness / 1000)) – ((thickness / 1000) * (thickness / 1000));
volume = area * length;
// Surface area calculation for angle is complex, often approximated or ignored if not critical.
// For simplicity, we can omit it or provide a basic approximation.
// surfaceArea = … complex calculation …
break;
case 'beam':
var flangeWidth = parseFloat(document.getElementById('beamFlangeWidth').value); // mm
var webHeight = parseFloat(document.getElementById('beamWebHeight').value); // mm
var flangeThickness = parseFloat(document.getElementById('beamFlangeThickness').value); // mm
var webThickness = parseFloat(document.getElementById('beamWebThickness').value); // mm
dim1 = flangeWidth; unit1 = 'mm (Flange)';
dim2 = webHeight; unit2 = 'mm (Web)'; // Not ideal dim2, maybe indicate differently
// Approximate area for I-beam
var area = 2 * (flangeWidth / 1000) * (flangeThickness / 1000) + (webHeight / 1000 – 2 * flangeThickness / 1000) * (webThickness / 1000);
volume = area * length;
// Surface area for beams is complex and often not a primary concern for weight calcs.
// surfaceArea = … complex calculation …
break;
}
var weight = density * volume;
document.getElementById('mainResult').textContent = weight.toFixed(2) + ' kg';
document.getElementById('intermediateDensity').textContent = density.toLocaleString();
document.getElementById('intermediateVolume').textContent = volume.toFixed(5);
document.getElementById('intermediateSurfaceArea').textContent = surfaceArea.toFixed(4); // Display surface area
updateTableValues(density, volume, weight, surfaceArea, dim1, dim2, unit1, unit2);
}
function updateTableValues(density, volume, weight, surfaceArea, dim1, dim2, unit1, unit2) {
var steelType = document.getElementById('steelType');
var shape = document.getElementById('shape');
document.getElementById('tableSteelType').textContent = steelType.options[steelType.selectedIndex].text;
document.getElementById('tableSteelShape').textContent = shape.options[shape.selectedIndex].text;
if (density !== undefined) document.getElementById('tableDensity').textContent = density.toLocaleString(); else document.getElementById('tableDensity').textContent = '–';
if (volume !== undefined) document.getElementById('tableVolume').textContent = volume.toFixed(5); else document.getElementById('tableVolume').textContent = '–';
if (weight !== undefined) document.getElementById('tableWeight').textContent = weight.toFixed(2); else document.getElementById('tableWeight').textContent = '–';
if (surfaceArea !== undefined) document.getElementById('tableSurfaceArea').textContent = surfaceArea.toFixed(4); else document.getElementById('tableSurfaceArea').textContent = '–';
// Update dimensions based on current shape
var dim1Display = dim1 !== undefined ? dim1.toLocaleString() : '–';
var dim2Display = dim2 !== undefined ? dim2.toLocaleString() : '–';
var unit1Display = unit1 || ";
var unit2Display = unit2 || ";
document.getElementById('tableDim1').textContent = dim1Display;
document.getElementById('tableDim1Unit').textContent = unit1Display;
var dim2Row = document.getElementById('tableDim2');
var dim2UnitRow = document.getElementById('tableDim2Unit');
if (dim2 !== undefined && dim2 !== 0 && dim2 !== null) {
dim2Row.style.display = "; // Show row
dim2UnitRow.style.display = ";
dim2Row.textContent = dim2Display;
dim2UnitRow.textContent = unit2Display;
} else {
dim2Row.style.display = 'none'; // Hide row if no second dimension
dim2UnitRow.style.display = 'none';
}
// Update length in table
var length = parseFloat(document.getElementById('length').value);
if (!isNaN(length)) {
document.getElementById('tableLength').textContent = length.toLocaleString();
} else {
document.getElementById('tableLength').textContent = '–';
}
}
function resetCalculator() {
document.getElementById('steelType').value = defaultValues.steelType;
document.getElementById('shape').value = defaultValues.shape;
document.getElementById('length').value = defaultValues.length;
// Reset shape-specific inputs
updateShapeSpecificInputs(); // This will repopulate and set defaults
// Manually set default values for the specific inputs that get generated
var shape = defaultValues.shape;
if (shape === 'bar') document.getElementById('barDiameter').value = defaultValues.barDiameter;
if (shape === 'pipe') {
document.getElementById('pipeOuterDiameter').value = defaultValues.pipeOuterDiameter;
document.getElementById('pipeInnerDiameter').value = defaultValues.pipeInnerDiameter;
}
if (shape === 'plate') {
document.getElementById('plateWidth').value = defaultValues.plateWidth;
document.getElementById('plateThickness').value = defaultValues.plateThickness;
}
if (shape === 'angle') {
document.getElementById('angleLeg1').value = defaultValues.angleLeg1;
document.getElementById('angleLeg2').value = defaultValues.angleLeg2;
document.getElementById('angleThickness').value = defaultValues.angleThickness;
}
if (shape === 'beam') {
document.getElementById('beamFlangeWidth').value = defaultValues.beamFlangeWidth;
document.getElementById('beamWebHeight').value = defaultValues.beamWebHeight;
document.getElementById('beamFlangeThickness').value = defaultValues.beamFlangeThickness;
document.getElementById('beamWebThickness').value = defaultValues.beamWebThickness;
}
calculateSteelWeight();
updateChartData(); // Reset chart too
}
function copyResults() {
var mainResult = document.getElementById('mainResult').textContent;
var intermediateDensity = document.getElementById('intermediateDensity').textContent;
var intermediateVolume = document.getElementById('intermediateVolume').textContent;
var intermediateSurfaceArea = document.getElementById('intermediateSurfaceArea').textContent;
var tableSteelType = document.getElementById('tableSteelType').textContent;
var tableSteelShape = document.getElementById('tableSteelShape').textContent;
var tableDensity = document.getElementById('tableDensity').textContent;
var tableLength = document.getElementById('tableLength').textContent;
var tableDim1 = document.getElementById('tableDim1').textContent;
var tableDim1Unit = document.getElementById('tableDim1Unit').textContent;
var tableDim2 = document.getElementById('tableDim2').textContent;
var tableDim2Unit = document.getElementById('tableDim2Unit').textContent;
var tableVolume = document.getElementById('tableVolume').textContent;
var tableWeight = document.getElementById('tableWeight').textContent;
var resultText = "— Steel Weight Calculation Results —\n\n";
resultText += "Primary Result:\n";
resultText += mainResult + "\n\n";
resultText += "Intermediate Values:\n";
resultText += "- Density: " + intermediateDensity + " kg/m³\n";
resultText += "- Volume: " + intermediateVolume + " m³\n";
resultText += "- Surface Area: " + intermediateSurfaceArea + " m²\n\n";
resultText += "Key Assumptions & Inputs:\n";
resultText += "- Steel Type: " + tableSteelType + "\n";
resultText += "- Steel Shape: " + tableSteelShape + "\n";
resultText += "- Length: " + tableLength + " m\n";
resultText += "- Dimension 1: " + tableDim1 + " " + tableDim1Unit + "\n";
if (tableDim2 !== '–') {
resultText += "- Dimension 2: " + tableDim2 + " " + tableDim2Unit + "\n";
}
resultText += "\nFull Details:\n";
resultText += "- Density: " + tableDensity + " kg/m³\n";
resultText += "- Volume: " + tableVolume + " m³\n";
resultText += "- Calculated Weight: " + tableWeight + "\n";
// Use a temporary textarea to copy text
var textArea = document.createElement("textarea");
textArea.value = resultText;
document.body.appendChild(textArea);
textArea.select();
try {
document.execCommand('copy');
alert('Results copied to clipboard!');
} catch (e) {
alert('Failed to copy results. Please copy manually.');
}
document.body.removeChild(textArea);
}
// Initial setup
document.addEventListener('DOMContentLoaded', function() {
updateShapeSpecificInputs(); // Populate initial shape inputs
calculateSteelWeight(); // Calculate initial weight
updateChartData(); // Draw initial chart
});