Steel coil weight calculator

weight_lb = (π × (OD/2)² − π × (ID/2)²) × width × 0.2833

Carbon steel only at 0.2833 lb/in³; other metals swap the density (see coil-density-table). Assumes tightly wound coil with no air gaps, so real weight is slightly lower. Worthington: estimates are for reference only. Worthington's input ranges: thickness 0.005-0.650 in, weight 100-80,000 lb.

Worked example: Our check with Worthington's code: OD 48, ID 20, width 36 in -> 15,251 lb.

PIW = coil_weight_lb / width_in

PIW is how coil reels, cradles and straighteners are often rated alongside max weight and width; compare to equipment capacity / width.

Worked example: 15,251 lb / 36 in = 423.6 PIW.

length_ft = weight_lb / (width_in × thickness_in × 0.2833 × 12)

Carbon steel density. Equivalent general form: length = weight / (width × thickness × density) (Seather).

Worked example: 15,251 lb, 36 in x 0.060 in -> 2,077 ft.