RFQ Tracker
Track quotations, due dates, customer communications, and RFQ status from one dashboard.
Coil Weight Calculator
Calculate coil weight from outer diameter, inner diameter, strip width, and material density. For steel, stainless steel, aluminum, and other metals.
Ready to Quote This Job?
After calculating material requirements, many manufacturers track RFQs, due dates, customer communications, and quotation status using the RFQ Tracker.
Manufacturing Workflow
Most manufacturing jobs follow a simple workflow: calculate material requirements, estimate costs, prepare quotations, and track RFQs. The tools below help manage each stage.
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Steel Weight Calculator
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Coil Thickness Calculator
Back-calculate strip thickness from coil weight, OD, ID, and width.
Coil Length Calculator
Determine total strip length from weight, thickness, and width.
Coil OD Calculator
Calculate outer diameter from weight, ID, width, and density.
Coil ID Calculator
Determine inner diameter for mandrel sizing and decoiler compatibility.
Coil Width Calculator
Calculate strip width from coil weight, OD, ID, and density.
Material Cost Calculator
Calculate raw material cost, cost per part, scrap cost, and total batch cost for manufacturing.
Once material quantities and costs are calculated, the next step is managing customer RFQs, quotation deadlines, and communications. The RFQ Tracker helps organize the entire quotation process from enquiry to submission.
How to Calculate Coil Weight
Calculating coil weight is fundamental in metal processing, logistics, and procurement. The standard formula uses the annular cross-sectional area: Weight = π × (OD² − ID²) × Width × Density ÷ 4. This treats the coil as a hollow cylinder, giving results accurate within 2–5% of scale weight. Our calculator accepts OD, ID, width, and density, outputting weight in kilograms instantly.
Press shops rely on coil weight to plan decoiler loading, schedule production runs, and verify supplier invoices. Logistics teams use it for crane selection and truck payload planning. A 1500 mm wide HR coil at 1800 mm OD on 508 mm ID weighs approximately 21 metric tons—critical information for material handling safety.
Steel Coil Weight Formula
The steel coil weight formula derives from hollow cylinder geometry. Volume = π/4 × (OD² − ID²) × Width. Multiply by density (7850 kg/m³ for carbon steel) to get mass. For a coil with OD 1800 mm, ID 508 mm, width 1250 mm: Weight = π/4 × (1.8² − 0.508²) × 1.25 × 7850 ≈ 21,600 kg. Real coils weigh 2–4% less due to inter-wrap air gaps.
This formula applies equally to all materials—only density changes. Aluminum coils at 2700 kg/m³ weigh roughly one-third of equivalent steel coils, while stainless steel at 8000 kg/m³ weighs slightly more than carbon steel.
Manufacturing Applications
In press shop operations, coil weight determines decoiler capacity requirements—exceeding limits risks equipment damage. Production planners divide coil weight by part weight to estimate parts per coil and schedule changeovers. Procurement teams verify quoted weights against calculations to catch invoicing errors. Logistics departments confirm crane ratings exceed individual coil weights and plan flatbed loading (20–24 ton capacity) to maximize shipment efficiency.
Different industries handle different ranges: automotive stamping (8–20 tons), HVAC fabrication (2–5 tons), construction roofing (5–12 tons), and electrical lamination (1–4 tons). Our calculator serves all these applications with support for every common engineering material.
Frequently Asked Questions
How do you calculate coil weight?▼
Coil weight is calculated using the formula: Weight = π × (OD² − ID²) × Width × Density ÷ 4. You need the outer diameter, inner diameter, strip width, and material density.
What is the formula for steel coil weight?▼
For steel coils: Weight (kg) = π × ((OD/1000)² − (ID/1000)²) × (Width/1000) × 7850 ÷ 4, where dimensions are in mm and density is 7850 kg/m³ for carbon steel.
Does coil density affect weight?▼
Yes, material density directly impacts coil weight. Steel is 7850 kg/m³, stainless steel 7750–8000 kg/m³, and aluminum approximately 2700 kg/m³. Same-size coils weigh nearly 3× more in steel than aluminum.
How accurate is coil weight estimation?▼
Mathematical estimation is typically accurate within 2–5% of actual weighed values. Variations arise from air gaps between wraps, edge wave, thickness tolerances, and strip flatness.
Can I calculate stainless steel coil weight?▼
Yes. Select stainless steel grade—SS304/SS316 uses 8000 kg/m³, SS430 uses 7750 kg/m³. The formula is identical; only density changes.
What units does the calculator support?▼
Dimensions in millimeters (mm), output in kilograms (kg). Divide by 1000 for metric tons or multiply by 2.205 for pounds.
How do I calculate weight from length and thickness?▼
Use: Weight = Length × Width × Thickness × Density. This alternative formula works when OD and ID are unavailable.
Why is coil weight important in manufacturing?▼
Coil weight determines crane capacity needs, truck payload limits, decoiler load ratings, raw material costs, and production planning quantities.
What is a typical steel coil weight?▼
Hot-rolled coils: 5–25 metric tons (OD 1200–2100 mm). Cold-rolled coils: 3–15 metric tons with tighter tolerances.
Can I use this for aluminum or copper coils?▼
Yes. Select the material or enter custom density. Aluminum (2700 kg/m³), copper (8960 kg/m³), brass (8500 kg/m³) are all supported.