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Steel Coil Length Calculator from Weight
Coil weight alone does not tell you how much strip is available for production. Convert the net mass of a carbon-steel coil into theoretical length and area before planning cut-to-length work or material purchases.
Your dimensions
Assumes uniform, uncoated carbon steel. Core, packaging, zinc or paint mass and production scrap are excluded from the calculation.
Calculation results
- Coil length
- 254.78m
- Sheet area
- 318.47m²
- Weight per metre
- 19.63kg/m
- Weight per square metre
- 15.7kg/m²
How to use this tool
- Enter net steel mass in kilograms, excluding the core and packaging.
- Enter width and thickness in millimetres; a 1.25 m width is 1250 mm.
- Read theoretical length and area. Deduct head and tail losses and process scrap separately to plan usable production material.
Calculation formula
L (m) = M (kg) ÷ [w (mm) × t (mm) × 0.00785]
M is net mass, w is strip width and t is thickness. Width multiplied by thickness gives the strip’s cross-sectional area. Density converts that area into kg/m; net mass divided by kg/m gives coil length.
Worked example
A 5,000 kg coil, 1,250 mm wide and 2 mm thick, contains approximately 254.78 m of strip and 318.47 m² of sheet. Its linear mass is 19.625 kg/m.
Frequently asked questions
Why can the measured coil length differ?
Thickness and width tolerances, coating mass, packaging or core weight and damaged head or tail sections affect the usable length. Use net mass and measured thickness for a closer estimate.
Is calculated length the usable production length?
No. It is the theoretical total strip length. Deduct edge trimming, head and tail losses and machine scrap according to the actual production process.
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Sources and calculation basis
Industry references for density and planning tools; this calculator’s method and limitations are explained above.
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