Steel Coil Weight Calculator & Size Guide: GI, PPGI, Galvalume

Calculating the weight of a steel coil is essential for logistics planning, inventory management, and cost estimation. Whether you are dealing with Galvanized (GI), Prepainted (PPGI), or Galvalume (GL) coils, the formula remains similar.

The Fundamental Steel Coil Weight Formula

To calculate the weight of a steel coil, you need three measurements: thickness, width, and length. Alternatively, if you know the Outer Diameter (OD) and Inner Diameter (ID), you can calculate the weight without unrolling it.

Weight (kg) = Thickness (mm) × Width (mm) × Length (m) × 7.85 / 1000

*Note: 7.85 is the standard density of steel (g/cm³).

Calculating by Coil Diameter (The Professional Way)

In most warehouses, you only have the diameters. Use this formula:

Weight (kg) = (OD² - ID²) × Width (mm) × 0.00000616

Common Size Chart for GI & PPGI Coils

Thickness (mm)	Width (mm)	Weight per Meter (kg)	Common App
0.30	1000	2.355	Roofing Sheets
0.50	1219	4.785	Home Appliances
1.00	1250	9.812	Automotive Parts
2.00	1500	23.550	Structural Components

Factors Affecting Coil Weight

Coating Mass: For GI coils, the zinc coating adds weight. Z275 has more zinc than Z120.
Paint Layers: For PPGI, the top coat and primer thickness contribute to the total weight.
Density Variations: While 7.85 is standard, some alloys vary slightly.

Need Precise Steel Coil Specifications?

Contact Segsteel for detailed technical data sheets and competitive pricing on GI, PPGI, and Galvalume coils.

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