Calculate Steel Coil Weight

Choose calculation mode: by coil dimensions (OD/ID) or by unrolled length/width/thickness.

mm
mm
mm
coils
Weight per Coil
—
kg
Total Weight
—
kg
Est. Length (Diameter mode only)
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m

How to Use This Calculator

  1. Choose calculation mode — By outer/inner diameter (coil geometry) or by unrolled length, width and thickness.
  2. Select material — Pick from carbon steel, stainless steel, galvanized, aluminum, copper, or enter custom density.
  3. Enter dimensions — Fill in OD/ID/width or length/width/thickness as per the selected mode.
  4. Set quantity — Enter number of coils.
  5. Click "Calculate" — View weight per coil, total weight, and estimated unrolled length (when using diameter mode).

Steel Coil Weight Calculation Formulas

Method 1: By Outer/Inner Diameter

Calculate coil weight directly from its geometry without knowing the unrolled length.

Weight (kg) = π × (OD² – ID²) × Width × Density ÷ 4,000,000

Where OD, ID, Width are in mm; Density in g/cm³. The constant 4,000,000 converts mm³ to cm³ and accounts for π/4.

Method 2: By Length, Width & Thickness

Use when unrolled sheet length is known.

Weight (kg) = Width (mm) × Thickness (mm) × Length (m) × Density (g/cm³) × 0.001

Example: 1000 mm wide, 1 mm thick, 200 m long carbon steel coil = 1000×1×200×7.85×0.001 = 1570 kg.

Length Estimation from Diameters

Length (m) = (OD² – ID²) × 0.7854 ÷ Thickness (mm) ÷ 1000

Standard Coil Inner Diameters

Common IDs: 508 mm (20") and 610 mm (24"). The calculator defaults to 508 mm.

Steel Coil Density & Standard Dimensions

Material Density Reference (g/cm³ | kg/m³)

  • Carbon Steel (ASTM A36) — 7.85 g/cm³ | 7,850 kg/m³
  • Stainless Steel 304 — 7.93 g/cm³ | 7,930 kg/m³
  • Stainless Steel 316 — 8.00 g/cm³ | 8,000 kg/m³
  • Stainless Steel 430 — 7.75 g/cm³ | 7,750 kg/m³
  • Galvanized Steel — ~8.05 g/cm³ (slightly higher due to zinc coating)
  • Aluminum — 2.71 g/cm³ | 2,710 kg/m³
  • Copper — 8.94 g/cm³ | 8,940 kg/m³

Standard Coil Dimensions

ParameterTypical RangeCommon Values
Thickness0.12 – 21.0 mm0.3 – 16 mm (hot-rolled) / 0.3 – 3 mm (cold-rolled)
Width600 – 2,200 mm1,000 mm, 1,250 mm, 1,500 mm
Inner Diameter508 mm / 610 mm508 mm (20"), 610 mm (24")
Outer Diameter900 – 2,300 mm~1,200 mm – 2,000 mm
Coil Weight3 – 30 metric tons5 – 15 tons

ASTM A568/A568M Tolerances

ASTM A568 defines general requirements for steel sheets in coils, including thickness, width, and flatness tolerances for hot-rolled and cold-rolled products.

  • Thickness tolerance: Varies by thickness and width; typically ±0.05 mm to ±0.25 mm for cold-rolled strip.
  • Width tolerance: ±2 mm to ±6 mm depending on specified width.
  • Flatness tolerance: Specified in ASTM A568/A568M; tighter tolerances available for strip products.
  • Actual weight may vary ±3-5% due to mill tolerances and density variations.

Carbon Steel Coil Weight per Meter (kg/m)

For quick estimation: Weight per meter = Width (m) × Thickness (mm) × 7.85. Common width: 1,250 mm (1.25 m).

Thickness (mm)kg/m (width 1000mm)kg/m (width 1250mm)kg/m (width 1500mm)
0.53.934.915.89
1.07.859.8111.78
1.511.7814.7217.66
2.015.7019.6323.55
3.023.5529.4435.33
4.031.4039.2547.10
5.039.2549.0658.88
6.047.1058.8870.65
8.062.8078.5094.20
10.078.5098.13117.75

Formula: kg/m = Width(m) × Thickness(mm) × 7.85 (carbon steel).

Frequently Asked Questions

How accurate is the steel coil weight calculator?
The calculator provides theoretical weight based on nominal dimensions and standard density. Actual weight may vary by ±3-5% due to manufacturing tolerances (ASTM A568) and density variations. For exact weights, refer to mill test certificates.
What is the standard inner diameter of a steel coil?
The most common inner diameters are 508 mm (20 inches) and 610 mm (24 inches). These sizes are standardized to fit most decoiling equipment and mandrels.
How do I calculate coil length from weight?
Length (m) = Weight (kg) ÷ [Width (m) × Thickness (mm) × Density (kg/m³) ÷ 1000]. For carbon steel: Length = Weight (kg) ÷ (Width(m) × Thickness(mm) × 7.85).
What is a typical steel coil weight?
Steel coils typically weigh between 3 and 30 metric tons, with common ranges being 5-15 tons. Hot-rolled coils tend to be heavier, while cold-rolled and galvanized coils are often 3-10 tons.
How much does a 2mm × 1250mm carbon steel coil weigh per meter?
Approximately 19.63 kg/m. Calculation: 1.25 (m) × 2 (mm) × 7.85 = 19.625 kg/m.
What is ASTM A568/A568M?
ASTM A568/A568M is the standard specification for general requirements for carbon, structural, and high-strength low-alloy steel sheets in coils and cut lengths. It covers thickness, width, and flatness tolerances.