Drum Capacity Calculator A Barrel diameter: B Flange diameter: C Drum length: D Freeboard: Full_DrumANSI B30.7 – 1/2″ clearanceANSI A10.22 – 2″ clearanceUK Den – 2.5X rope diameter clearance1X rope diameter clearanceOther – specify E Cable diameter: English 3/16″1/4″5/16″3/8″7/16″1/2″9/16″5/8″3/4″7/8″1″1 1/8″1 1/4″1 3/8″1 1/2″1 5/8″1 3/4″1 7/8″2″2 1/8″2 1/4″2 3/8″2 1/2″ Metric 8 mm9 mm10 mm11 mm12 mm13 mm14 mm16 mm18 mm19 mm20 mm22 mm24 mm26 mm28 mm32 mm36 mm40 mm = inches Unit of Measure: English Metric Drum surface: Smooth Grooved Total Drum Capacity: Total Working Drum Capacity: Recommended Working Capacity: D / d ratio: Minimum distance to lead sheave: Maximum distance to lead sheave: Wire Rope chart Definitions