Conveyor Belt Speed Calculator — FPM & Capacity

Short answerBelt speed (ft/min) = π × pulley Ø(in) × RPM ÷ 12. Throughput (TPH) ≈ load cross-section(ft²) × speed(ft/min) × 60 × bulk density(lb/ft³) ÷ 2,000.

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How it's calculated

The belt moves at the pulley surface speed: circumference times RPM. Throughput then depends on how much material rides on the belt — the cross-sectional area of the load profile — times the speed and bulk density. Faster belts move more but need more power and can spill fine materials.

Speed(ft/min) = π × Ø(in) × RPM ÷ 12 TPH = Area(ft²) × Speed × 60 × density(lb/ft³) ÷ 2,000

Worked example

12 in pulley at 60 RPM → speed = π×12×60÷12 = 188 ft/min.
0.4 ft² of sand → ≈ 226 TPH.

Reference tables

Belt speed from a 12-inch pulley

RPM	ft/min
30	94
45	141
60	188
90	283

A number the tables do not give: a 12-inch drive pulley at 60 RPM runs the belt at about 188 ft/min — roughly 2.1 mph.

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The interactive version of this calculator is on our build queue. Meanwhile, these live example simulators show exactly how yours would look and behave on your own domain:

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FAQ

Drive or tail pulley?

Use the drive pulley diameter — belt speed equals its surface speed. Idlers do not set speed.

Pitch or outside diameter?

Use the effective diameter the belt rides on (add belt thickness to the pulley OD for a close figure).

What sets throughput?

Speed, the load cross-section (belt width and surcharge angle) and bulk density. Wider belts and steeper edges carry more.

How fast is too fast?

Fines and dust limit speed to avoid spillage and wear; CEMA gives maximum speeds by material and belt width.

This page is a reference aid. Always verify against the conveyor and CEMA design references. Figures shown are for orientation, not a stamped design.

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