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Coil Length From Weight Calculator

Work out coil length from weight instantly with clear inputs, formula shown and shareable results.

About Coil Length From Weight Calculator

A coil's length follows from its mass, cross-section and density: length = weight / (width x thickness x density). Steel is 7850 kg/m3, aluminium 2700 and copper 8960. Weight per metre is the practical figure for setting blank counts against a coil.

Formula

Coil length

Length (m) = weight (kg) / (width (m) x thickness (m) x density (kg/m3))

Worked example

With the default values below, Coil Length From Weight Calculator returns Coil Length of 636.94. Change any input above and every figure here is recalculated in your browser.

Inputs used

Coil Weightminimum 0.01 kg
5,000 kg
Strip Widthminimum 0.01 mm
1,250 mm
Thicknessminimum 0.001 mm
0.8 mm
Material Densityminimum 1 kg/m3
7,850 kg/m3

Results

Coil Length
636.94
Weight Per Metre
7.8500
Material Volume
0.63694
Surface Area
796.18

Step by step

  1. 1Values used
  2. 2Coil length
  3. 3Coil Length= 636.94
  4. 4Weight Per Metre= 7.8500
  5. 5Material Volume= 0.63694
  6. 6Surface Area= 796.18

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 5 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does actual length come out short?

Thickness tolerance is the main reason — a coil rolled at the top of its thickness tolerance is shorter for the same weight. Crown and edge trim also consume width.

How do I get the length from coil diameters instead?

Length = pi x (outer diameter^2 - inner diameter^2) / (4 x thickness), all in consistent units. It is useful when only the coil geometry is known.

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