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Screw Conveyor Capacity & Power Calculator

Capacity and power from screw diameter, shaft diameter, pitch, speed and trough fill.

Metric · IS practiceFormula shown with your numbersNothing stored

How this calculator works

Capacity is the annular area between the screw outside diameter and the centre shaft, multiplied by pitch, rotational speed, the fill fraction and a factor for the incline. Power is the sum of three parts: the horizontal power to move the material against the trough, the power to turn the empty screw, and the power to lift the material where the conveyor is inclined.

Formulas used

CapacityQ = 47.1 × (D² − d²) × P × n × λ × C (m³/h)
Material powerP_H = Q × ρ × L × λ_m ÷ 367
Empty screw powerP_N = D × L ÷ 20
Lift powerP_st = Q × ρ × H ÷ 367

Checked against

A 250 mm screw at 45 rpm with 30% trough fill returns 9.0 m³/h, which agrees with the standard capacity tables.

Worth knowing

Practical motor selection normally runs 1.5–2× the calculated figure. Starting against a flooded trough needs far more torque than steady running, and this is the most common reason a screw conveyor stalls in service.

Screw Conveyor Capacity & Power Calculator — common questions

What fill percentage should I use for a screw conveyor?
30% for abrasive or sluggish material and up to 45% for free-flowing powders. Sizing above 45% leaves no margin for a damp or lumpy batch.
How do I size the motor for a screw conveyor?
Add the material power, the empty-screw power and the lift power, then apply a service factor of 1.5–2 before choosing the motor frame. The calculated power is a running figure, not a starting figure.

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Got a number you don’t like?

If the sizing is telling you something awkward, send it over. We build these machines — we can tell you whether the number is wrong or the layout is.

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Contact

Chennai, Tamil Nadu

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+91 91763 23669

spdynamics25@gmail.com

Eshwar C S

Works & office

T-231 A, Sidco Women's Industrial Park
Kattur, Avadi, Chennai – 600 062
Tamil Nadu, India

GSTIN

33DENPP4793D1Z5

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Sidco Women’s Industrial Park, Kattur · Avadi, Chennai

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