Bucket Elevator Design Calculator

A bucket elevator lifts bulk material vertically using a chain or belt with buckets attached at regular intervals, and its throughput comes down to how much material each bucket carries times how fast buckets pass the discharge point. This calculator estimates bucket volume as width times projection (the depth from belt to lip) times length, scaled by a 0.7 shape factor that accounts for standard AA/AC-style bucket profiles not being perfect rectangular boxes. Multiplying that volume by your fill percentage and bulk density gives the mass carried per bucket, and from there the calculator solves for the belt or chain speed needed to hit your target throughput given the bucket pitch (center-to-center spacing), clamping the result to a practical 0.5–4.0 m/s range. That clamped speed also determines discharge type: above 1.5 m/s the buckets fling material out centrifugally at the head pulley; below that, material is guided out continuously — a distinction that affects bucket style and spacing in real installations. Motor power follows the horsepower-sizing method in CEMA's Bucket Elevator Book: Best Practices in Design (Publication No.

375-2017), starting from pure lift power (throughput times lift height times gravity), then adding a 15% factor for the extra work of scooping material out of the boot and overcoming belt/chain friction, divided by drive efficiency. Head shaft torque assumes a fixed 500 mm head pulley diameter to convert power into shaft RPM and torque — a placeholder you should replace with your actual pulley size once selected. Casing width and depth are sized with fixed clearances (50 mm and 75 mm respectively) around the bucket dimensions. Because bucket shape factor, discharge losses, and head pulley size are all estimates, use these outputs to narrow down equipment options rather than as final structural specifications.