Angle Iron Weight Calculator

Angle Iron Weight Calculator

Calculate structural steel and aluminum angle weights

Metric (mm / meters) Imperial (inches / feet)

Carbon Steel Stainless Steel Aluminum Copper Brass

Estimated Total Weight

0.00 kg

function updateUnits() { var unit = document.getElementById('unitSystem').value; var dims = document.getElementsByClassName('unit-dim'); var lens = document.getElementsByClassName('unit-len'); for(var i = 0; i < dims.length; i++) { dims[i].innerText = unit === 'metric' ? 'mm' : 'in'; } for(var j = 0; j < lens.length; j++) { lens[j].innerText = unit === 'metric' ? 'm' : 'ft'; } } function calculateAngleWeight() { var unit = document.getElementById('unitSystem').value; var legA = parseFloat(document.getElementById('legA').value); var legB = parseFloat(document.getElementById('legB').value); var thickness = parseFloat(document.getElementById('thickness').value); var length = parseFloat(document.getElementById('totalLength').value); var density = parseFloat(document.getElementById('material').value); var qty = parseFloat(document.getElementById('quantity').value) || 1; if (isNaN(legA) || isNaN(legB) || isNaN(thickness) || isNaN(length)) { alert("Please fill in all dimensions with valid numbers."); return; } var totalWeight = 0; var unitLabel = ""; var weightPerUnit = ""; if (unit === 'metric') { // Calculation: ((A + B – T) * T * Length * Density) / 1,000,000 // Convert mm to meters for area: (A+B-T)*T is sq mm. / 1,000,000 for sq meters var areaSqM = ((legA + legB – thickness) * thickness) / 1000000; var weightPerMeter = areaSqM * density; totalWeight = weightPerMeter * length * qty; unitLabel = "kg"; weightPerUnit = weightPerMeter.toFixed(3) + " kg/m"; } else { // Imperial: ((A + B – T) * T * Length(ft) * 12 * Density(lb/in3)) // Density from kg/m3 to lb/in3: density * 0.000036127 var densityLbIn3 = density * 0.000036127; var areaSqIn = (legA + legB – thickness) * thickness; var lengthInches = length * 12; var weightPerFoot = areaSqIn * 12 * densityLbIn3; totalWeight = weightPerFoot * length * qty; unitLabel = "lbs"; weightPerUnit = weightPerFoot.toFixed(3) + " lbs/ft"; } document.getElementById('resultArea').style.display = 'block'; document.getElementById('totalWeightDisplay').innerText = totalWeight.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}) + " " + unitLabel; document.getElementById('unitWeightDisplay').innerText = "Weight per unit: " + weightPerUnit; }

How to Use the Angle Iron Weight Calculator

This calculator helps engineers, fabricators, and contractors determine the weight of "L-shaped" structural steel (angle iron). Whether you are calculating for equal or unequal leg angles, the weight is determined by the cross-sectional area and the specific gravity of the material.

The Angle Iron Weight Formula

To calculate the weight of an angle iron manually, you can use the following geometric approximation:

Weight = [(Leg A + Leg B – Thickness) × Thickness] × Length × Density

• Leg A & B: The outside widths of the two legs.
• Thickness: The thickness of the metal.
• Subtraction: We subtract one thickness from the sum of the legs to avoid double-counting the corner area where the legs overlap.

Material Densities Used

Material	Density (kg/m³)	Density (lb/in³)
Carbon Steel	7,850	0.284
Aluminum (6061)	2,710	0.098
Stainless Steel (304)	8,000	0.289

Example Calculation

Suppose you have a 50mm x 50mm x 5mm steel angle iron that is 6 meters long.

1. Sum of legs: 50 + 50 = 100mm
2. Adjust for corner thickness: 100 – 5 = 95mm
3. Area: 95mm * 5mm = 475 mm² (or 0.000475 m²)
4. Volume for 1m: 0.000475 m² * 1m = 0.000475 m³
5. Weight per meter: 0.000475 * 7850 kg/m³ = 3.73 kg/m
6. Total Weight: 3.73 kg/m * 6m = 22.38 kg

Note: Calculations provide theoretical weights. Actual weights may vary slightly due to manufacturing tolerances and the radius of the inside root (fillet) of the angle iron.