Conveyor Belt Speed & Capacity Calculator
Three quick tools for conveyor engineers and buyers — belt speed, bulk material capacity, and package throughput. Formulas and sources are shown below each result.
How these are calculated
| Result | Formula |
|---|---|
| Belt speed | V (ft/min) = π × D in × RPM ÷ 12 |
| Bulk capacity | Q (TPH) = A ft² × V ft/min × ρ lb/ft³ ÷ 33.333 |
| Volumetric flow | Q (ft³/hr) = 60 × A ft² × V ft/min |
| Package throughput | units/min = V ft/min × 12 ÷ (length + gap) in |
Belt-speed and capacity relationships follow standard belt-conveyor engineering practice (CEMA, Belt Conveyors for Bulk Materials ). The bulk-capacity mass equation Q = A·V·ρ ÷ 33.333 is the imperial form of Q = 3.6·A·v·δ (metric). The "estimate from belt width" option uses the simplified A ≈ k·B² factor (k = 0.075 / 0.090 / 0.105 for 20° / 35° / 45° troughing at ~20° surcharge); it is a first-pass approximation and can differ from CEMA table values by roughly 25%, so it is labeled as an estimate. For design and procurement, size against a CEMA capacity table.
Frequently asked questions
How do you calculate conveyor belt speed?
Belt speed equals π times the drive pulley diameter times its rotational speed. In imperial units with the diameter in inches: speed (ft/min) = π × diameter × RPM ÷ 12. A 12-inch pulley at 100 RPM moves the belt about 314 ft/min.
How do you calculate conveyor capacity in tons per hour?
Multiply the loaded cross-sectional area of material on the belt (ft²) by the belt speed (ft/min) and the material bulk density (lb/ft³), then divide by 33.333. The cross-sectional area depends on belt width, idler trough angle, and the material's surcharge angle — take it from a CEMA table for an accurate result.
What is surcharge angle?
The surcharge angle is the angle the surface of the conveyed material forms as it rides on a moving belt — typically 5° to 30° below the material's static angle of repose. A larger surcharge angle lets the belt carry more material, increasing capacity.
Does incline reduce conveyor capacity?
Yes. The formulas here estimate a level conveyor. Inclining the belt reduces usable capacity (and requires more power); CEMA publishes incline correction factors for design sizing.
Can Jealco supply the belt for my conveyor?
Yes. As an independent distributor, Jealco sources heavy-duty, light-duty, incline, solid-woven PVC, and food-grade conveyor belting across many manufacturers to match your width, PIW, ply, cover compound, and application. Send us your belt width, length, and material and we'll spec it.