Coil Calculator Steel Coil Calculator Use this helpful tool for a quick estimate in determining flat rolled steel coil lengths and weights. Click here to view our steel specifications. By Coil Diameter By Coil Weight ID (16 - 36) : OD (ID - 84) : Width (0.250 - 84) : Thickness (0.005 - 0.650) : Weight (100 - 80,000) : Width (0.250 - 84) : Thickness (0.005 - 0.650) : PIW: lbs. Weight: lbs. Length: ft. ID: OD: Sidewall: ID: OD: Sidewall: ID: OD: Sidewall: ID: OD: Sidewall: