RFQ Tracker
Track quotations, due dates, customer communications, and RFQ status from one dashboard.
Coil Length Calculator
Calculate total strip length in a coil from weight, thickness, width, and material density. Essential for production run planning and scheduling coil changes.
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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Continue your workflow with other free manufacturing calculators and tools.
Blanks Per Sheet Calculator
Calculate blanks per sheet, material utilization, yield, and scrap percentage.
Press Tonnage Calculator
Calculate press force for blanking, piercing, bending, and deep drawing operations.
Bend Allowance Calculator
Calculate bend allowance, bend deduction, outside setback, flat length, and K-factor for sheet metal bending.
Steel Weight Calculator
Calculate steel weight for plates, bars, pipes, tubes, angles, channels, and beams.
Coil Weight Calculator
Calculate coil weight from OD, ID, strip width, and material density.
Coil Thickness Calculator
Back-calculate strip thickness from coil weight, OD, ID, 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 Length
The coil length calculator uses: Length = Weight ÷ (Width × Thickness × Density). This treats the coil as a flat strip and converts the mass into linear meters. For a 7500 kg CRCA coil, 1250 mm wide, 0.8 mm thick: Length = 7500 ÷ (1.25 × 0.0008 × 7850) = 956 meters. At 150 mm feed pitch, this yields ~6373 press strokes.
The alternative geometric method uses OD and ID: Length = π × (OD² − ID²) ÷ (4 × Thickness). Both methods produce identical results when input data is consistent. The weight method is preferred when scale weight is available; the OD/ID method works for partial coils.
Production Planning with Coil Length
Parts per coil = Coil Length ÷ Feed Pitch. Run time = Parts ÷ Strokes Per Minute. For a 1200 m coil at 250 mm pitch, 35 SPM: 4800 parts in 137 minutes. This enables precise scheduling of coil changes, breaks, and shift handovers around natural pause points.
Knowing remaining length on a partially used coil prevents unexpected mid-part exhaustion. Apply a 2–3% safety factor to account for trim loss, leader/tail scrap, and thickness variation that reduce usable length below theoretical calculations.
Length for Cut-to-Length and Slitting
CTL lines divide length into sheets: a 1000 m coil cut at 2000 mm produces 500 sheets. Slitting preserves length—a 1250 mm coil slit into five 250 mm mults yields five coils each with the same ~1000 m length. Understanding these relationships helps planners order correct coil weights to fulfill downstream requirements.
Frequently Asked Questions
How do I calculate coil length from weight?▼
Length = Weight ÷ (Width × Thickness × Density). For a 10,000 kg steel coil, 1250 mm wide, 1.0 mm thick: Length = 10000 ÷ (1.25 × 0.001 × 7850) = 1019 meters.
How many meters are in a steel coil?▼
Typically 200–2000 meters depending on thickness, width, and weight. Thinner gauges yield more length per ton—0.5 mm has twice the length of 1.0 mm at the same weight.
Does thickness affect coil length?▼
Yes, inversely. Halving thickness doubles length at same weight and width. A 5-ton, 1000 mm wide coil has ~637 m at 1.0 mm but ~1274 m at 0.5 mm.
How do I calculate length from OD and ID?▼
Length = π × (OD² − ID²) ÷ (4 × Thickness). This geometric formula uses annular cross-section divided by strip thickness.
Why is coil length important for production planning?▼
Coil length ÷ feed pitch = number of press strokes per coil. This determines production run time and coil change frequency.
How accurate is calculated vs actual length?▼
Within 2–3% typically. Discrepancies from thickness variations, first/last wrap geometry, and trimmed ends.
Can I calculate length for partial coils?▼
Yes. Measure current OD of the partial coil, keep same ID (mandrel size), enter thickness, and calculate remaining length.
How does length relate to production run time?▼
Run time = Coil Length ÷ (Feed Pitch × Strokes Per Minute). A 1000 m coil at 200 mm pitch and 40 SPM = 125 minutes.
Does material type affect length calculation?▼
Density affects length when calculating from weight. When using OD/ID/thickness method, density is not needed—it's purely geometric.
What about length for slitting operations?▼
Slitting doesn't change length—a 1000 m master coil slit into narrower mults produces mults each with ~1000 m (minus any trim).