Coil Calculator Calculator
Find coil length, weight, and OD from gauge, width, and material so you can plan runs and reorders.
Using this calculator responsibly
The Coil Calculator calculator is an engineering aid for checking a shop-floor estimate before a setup, quote, or process review. Enter values in the units shown, confirm material properties against the applicable specification, and keep a record of the assumptions used. Calculator output does not override machine capacity, tooling limits, part requirements, or a qualified engineer's approval.
Before using a result in production, repeat the calculation with the extreme values allowed by the print or process window. Check that the selected material, thickness, geometry, and safety factor reflect the actual job. If a result approaches a press, die, fastener, or machine limit, stop and verify it with the equipment manufacturer or responsible engineer.
Inputs and results
Read every field label before entering data and avoid mixing inch and metric values. A useful result should be traceable to the job number, revision, material certification, and machine or tooling record. Treat warnings, invalid ranges, and unusual outputs as reasons to inspect the inputs rather than as values to work around.
Coil length, weight, and outer diameter follow from the strip gauge, width, and the coil’s inner and outer diameters. Knowing them lets you plan run length and reorder points.
Formula: Length (in) ≈ π × (OD² − ID²) / (4 × Thickness)
Worked example
- OD = 48 in, ID = 20 in, thickness = 0.060 in.
- Length ≈ π × (48² − 20²) / (4 × 0.060) = π × 1904 / 0.24 ≈ 24,900 in ≈ 2,075 ft.