Metal Coil Length Calculator

How the metal coil length calculator works

Mass per metre = density in kg/m³ × width in millimetres × thickness in millimetres ÷ 1,000,000. Gross strip length = net metal kilograms ÷ mass per metre. Positive density, width and thickness are required. The strip section is assumed uniform.

Usable mass = net metal mass × (1 − unusable percentage / 100). Usable length = usable mass ÷ mass per metre. This proportional allowance treats unusable mass and length on the same uniform-section basis; it does not model individual defects or an optimized cutting plan.

Purchased material cost is net metal mass × quote per kilogram, rounded half-up to cents. Cost per usable metre divides that rounded purchase cost by unrounded usable length, then rounds to cents. It is undefined when usable length is zero, including a 100% unusable allowance. Purchase cost remains payable in that scenario.

Enter metal-only mass and a density for the actual alloy. Core, pallet, packaging and any separately counted coating mass can distort the result. Width or gauge variation, coil winding geometry, lifting, uncoiling and machine capacities are not evaluated. The Gasparini manufacturer tool supports the mass-and-dimensions workflow.

Worked example

1,000 kg at an illustrative density of 2,700 kg/m³, 1,000 mm width and 1 mm thickness is 2.7 kg/m. Gross length is about 370.370 m. A 5% unusable allowance leaves about 351.852 m. At 3/kg, material is 3,000, or 8.53 per usable metre. Entering 540 kg instead gives 200 m gross and 190 m usable.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

• Gasparini: sheet-metal coil length and weight calculator