Steel Coil Weight Calculator
Accurate industrial calculation for logistics, manufacturing, and inventory management
Calculate Weight of Steel Coil
Enter the coil dimensions to obtain the estimated weight and volume.
Measured in millimeters (mm)
Must be greater than Inner Diameter
Standard ID is often 508mm or 610mm
Must be positive and less than OD
Width of the strip in millimeters (mm)
Carbon Steel (Standard) – 7.85 g/cm³
Stainless Steel (300 Series) – 7.90 g/cm³
Aluminum – 2.70 g/cm³
Copper – 8.96 g/cm³
Zinc – 7.14 g/cm³
Density affects the final weight calculation
Estimated Coil Weight
0 kg
Weight (lbs)
0 lbs
Volume
0 m³
Wall Thickness
0 mm
Visual Representation: Inner vs Outer Diameter
| Specification | Value |
|---|---|
| Material Density | 7850 kg/m³ |
| Outer Radius | 600 mm |
| Inner Radius | 254 mm |
| Cross-Sectional Area | 0 m² |
Formula Used: Weight = π × ((OD/2)² – (ID/2)²) × Width × Density
What is the Calculation for Weight of Steel Coil?
In the metal manufacturing, logistics, and trading industries, the ability to accurately calculate weight of steel coil is a fundamental skill. A steel coil is a finished steel product such as sheet or strip which has been wound or coiled after rolling. Unlike flat sheets where dimensions are easily visible, a coil is a tightly wound cylinder, making weight estimation dependent on geometric volume rather than direct linear measurement.
Knowing how to calculate weight of steel coil is essential for logistics planning (truck loading limits), inventory valuation, and production scheduling. Miscalculations can lead to overloaded transport vehicles, safety hazards during lifting, or significant financial discrepancies in material orders.
Who Needs This Calculator?
- Warehouse Managers: To ensure floor load capacities are not exceeded.
- Logistics Coordinators: To plan truck and shipping container loads within legal weight limits.
- Procurement Officers: To verify that invoiced weights match the physical dimensions of the received goods.
{primary_keyword} Formula and Mathematical Explanation
To calculate weight of steel coil, we treat the coil as a hollow cylinder. The math involves finding the volume of steel in that cylinder and multiplying it by the density of the material.
The standard formula is derived as follows:
- Calculate the volume of the cylinder defined by the Outer Diameter (OD).
- Subtract the volume of the empty cylinder defined by the Inner Diameter (ID).
- Multiply the resulting "annulus" area by the Width of the coil to get total Volume.
- Multiply Volume by the Density of steel.
Weight = π × (R² – r²) × W × D
| Variable | Meaning | Metric Unit | Typical Range |
|---|---|---|---|
| R (Large Radius) | Outer Radius (OD / 2) | meters (m) | 0.5m – 1.0m |
| r (Small Radius) | Inner Radius (ID / 2) | meters (m) | 0.25m – 0.4m |
| W | Coil Width | meters (m) | 0.6m – 2.0m |
| D | Density | kg/m³ | 7850 (Carbon Steel) |
Practical Examples (Real-World Use Cases)
Example 1: Standard Hot Rolled Coil
A logistics manager needs to ship a standard hot rolled coil. He measures the following dimensions to calculate weight of steel coil for the bill of lading.
- Outer Diameter: 1500 mm (1.5 m)
- Inner Diameter: 610 mm (0.61 m)
- Width: 1250 mm (1.25 m)
- Material: Carbon Steel (7850 kg/m³)
Calculation:
Volume = π × ((0.75)² – (0.305)²) × 1.25 ≈ 1.84 m³
Weight = 1.84 m³ × 7850 kg/m³ = 14,444 kg (approx 14.4 Tonnes)
Example 2: Precision Stainless Steel Slit Coil
A manufacturer is processing narrow slit coils for automotive parts. They need to verify the weight of a smaller stainless steel coil.
- Outer Diameter: 1000 mm
- Inner Diameter: 508 mm
- Width: 300 mm
- Material: Stainless Steel 304 (7900 kg/m³)
Calculation:
Using the calculator, we find the volume is approximately 0.174 m³.
Weight = 0.174 × 7900 = 1,374 kg.
How to Use This {primary_keyword} Calculator
This tool simplifies the complex geometry into a few easy steps. Here is how to use it effectively:
- Measure Outer Diameter (OD): Measure the full distance across the face of the coil. Enter this in millimeters.
- Measure Inner Diameter (ID): Measure the hole in the center. Common standards are 508mm or 610mm.
- Measure Width: Measure the side of the coil (the strip width).
- Select Material: Choose the correct metal. Most standard steel is "Carbon Steel", but Aluminum or Stainless Steel have significantly different densities.
- Review Results: The tool will instantly calculate weight of steel coil in both kilograms and pounds.
Key Factors That Affect {primary_keyword} Results
When you attempt to calculate weight of steel coil, several real-world factors can influence the final accuracy:
- Steel Density Variations: Not all steel is exactly 7850 kg/m³. Alloys with high chromium or nickel content (like Stainless) are heavier, while silicon-rich electrical steels might be lighter.
- Coil Crown (Shape): Steel strips are often slightly thicker in the center than the edges ("crown"). This slight convexity can add actual mass that a simple cylinder formula misses.
- Telescoping: If a coil is not wound perfectly tight (telescoping sides), the calculated volume based on width might be slightly off compared to the actual effective volume.
- Packing Materials: The calculator gives the net metal weight. Wooden pallets, strapping bands, and protective wrapping can add 20-50 kg to the gross weight.
- Measurement Errors: A 50mm error in measuring the Outer Diameter has a much larger impact on weight than a 50mm error in Width, due to the squared radius in the formula.
- Winding Tightness (Density Factor): Loosely wound coils have air gaps between layers. The theoretical calculation assumes a solid steel block, so a loose coil will actually weigh less than the calculated result.
Frequently Asked Questions (FAQ)
Why is it important to calculate weight of steel coil accurately?
Accurate calculation prevents overloading transport trucks, which attracts heavy fines and safety risks. It also ensures you are paying for the correct amount of material received.
Can I use this for Aluminum coils?
Yes. Simply change the "Material Type" dropdown to Aluminum. Aluminum is roughly one-third the weight of steel (Density ~2700 kg/m³).
What is the standard density of steel?
The industry standard for Carbon Steel is 7.85 g/cm³ or 7850 kg/m³. This is the default setting when you calculate weight of steel coil.
How do I convert the result to Tonnes?
Divide the kilogram result by 1,000 to get Metric Tonnes. For example, 15,000 kg is 15 Tonnes.
Does this calculator account for the coil core?
The formula assumes a hollow center (air). If your coil is wrapped around a heavy steel mandrel or spool that stays with the coil, you must add that weight separately.
What if my measurements are in Inches?
Convert your inches to millimeters by multiplying by 25.4 before entering them into the tool to accurately calculate weight of steel coil.
Why is the Inner Diameter (ID) usually fixed?
ID is determined by the mandrel size of the coiling machine (recoiler). Common industrial standards are 508mm (20 inches) and 610mm (24 inches).
Can I calculate the strip length from the weight?
Yes, if you know the thickness. Length = Volume / (Width × Thickness). This calculator focuses on weight, but the Volume intermediate result is useful for this calculation.
Related Tools and Internal Resources
Explore our other industrial calculation tools to assist with your manufacturing and logistics needs:
- Sheet Metal Weight Calculator – For flat plates and sheets.
- Tube & Pipe Weight Calculator – Determine mass for hollow structural sections.
- Metal Gauge Conversion Chart – Convert standard gauge numbers to millimeters.
- Aluminum Coil Calculator – Specific tools for non-ferrous metals.
- Container Loading Calculator – Optimize your shipping logistics.
- Steel Hardness Conversion – Compare Rockwell, Brinell, and Vickers scales.