Aluminum Coil Calculator

Aluminum Coil Weight & Length Calculator

Standard (0.0975) – 1100, 3003, 5052 Heavy (0.098) – 6061, 7075 Light (0.095)

Calculation Results:

Estimated Total Weight: 0 lbs (0 kg)

Estimated Total Length: 0 feet

Weight Per Inch Width: 0 PIW

function calculateAluminumCoil() { var od = parseFloat(document.getElementById('outer_diameter').value); var id = parseFloat(document.getElementById('inner_diameter').value); var width = parseFloat(document.getElementById('coil_width').value); var thickness = parseFloat(document.getElementById('coil_thickness').value); var density = parseFloat(document.getElementById('alloy_density').value); if (isNaN(od) || isNaN(id) || isNaN(width) || isNaN(thickness) || od <= id) { alert('Please enter valid dimensions. Outer diameter must be greater than inner diameter.'); return; } // Calculation Logic // Volume = PI * (OR^2 – IR^2) * Width // Weight = Volume * Density var outerRadius = od / 2; var innerRadius = id / 2; var weight = Math.PI * (Math.pow(outerRadius, 2) – Math.pow(innerRadius, 2)) * width * density; // Length = Weight / (Width * Thickness * Density) var lengthInches = weight / (width * thickness * density); var lengthFeet = lengthInches / 12; var piw = weight / width; // Display Results document.getElementById('results_area').style.display = 'block'; document.getElementById('weight_lbs').innerText = weight.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('weight_kgs').innerText = (weight * 0.453592).toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('total_length_ft').innerText = lengthFeet.toLocaleString(undefined, {minimumFractionDigits: 0, maximumFractionDigits: 0}); document.getElementById('piw_result').innerText = piw.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); }

Guide to Aluminum Coil Calculations

In the aluminum industry, precision is critical. Whether you are managing inventory for a manufacturing plant or planning a fabrication project, knowing the exact weight and length of an aluminum coil is essential for logistics, pricing, and machine setup.

How to Calculate Aluminum Coil Weight

The weight of an aluminum coil depends on its volume and the specific density of the alloy. The standard formula used in our calculator is:

Weight = π × [(OD/2)² – (ID/2)²] × Width × Density

• OD (Outer Diameter): The total distance across the outside of the coil.
• ID (Inner Diameter): The size of the core or the hole in the center.
• Width: The transverse dimension of the coil strip.
• Density: Aluminum is significantly lighter than steel. Common alloys like 3003 or 5052 have a density of roughly 0.0975 lbs per cubic inch.

Calculating Coil Length

Knowing the linear length of a coil helps in determining how many parts can be stamped or manufactured from a single roll. The formula is derived by dividing the total weight by the weight of a single linear inch of material:

Length = Total Weight / (Width × Thickness × Density)

Practical Example

Suppose you have an aluminum coil with the following specifications:

• ✅ Outer Diameter: 40 inches
• ✅ Inner Diameter: 20 inches
• ✅ Width: 48 inches
• ✅ Thickness: 0.040 inches

Using the density of 0.0975 lb/in³, the volume calculation first determines the amount of metal present. Our calculator would show this coil weighs approximately 4,410 lbs and spans a length of roughly 23,560 feet.

What is PIW?

PIW stands for Pounds Per Inch of Width. It is a standard industry metric used to describe the "density" of the coil's size relative to its width. It is calculated by dividing the total weight by the width of the coil. It helps manufacturers determine if their decoiling equipment can handle the weight of the material.