How To Calculate Conveyor Belt Speed

 Conveyor belt speed is an important factor for equipment longevity and efficiency. We show you how to find your belt’s speed. 

Why conveyor belt speed matters

The optimal speed balances efficiency, throughput, and belt life. Get it wrong and you get jams, slowdowns, and fast wear. There are three ways to learn your belt's feet per minute. 

1. Calculate belt speed with a formula
2. Measure belt speed with a tachometer
3. Ask the conveyor manufacturer

Let’s get into the details.

Calculate conveyor belt speed with a formula

If you have the following parameters, you can easily calculate the belt speed of your conveyor:

• Roller diameter: you’ll use this to calculate roller circumference
• Motor speed: the rotational speed of the motor measured in revolutions per minute (sometimes called “rotations per minute”) or RPM. Can be found on the motor nameplate.
• Gear reduction ratio: the gearbox speed reduction ratio, for example, 5:1. Required if a gearbox is used.

Without gear reduction

If your conveyor doesn’t have a reduction gearbox, use the following formula to calculate belt speed.

Speed = roller circumference x motor RPM

Use your roller diameter to derive the circumference with the following formula.

C = Dπ. 

The circumference is equal to the diameter times 3.14159. Super simple and straightforward.

With gear reduction

If your conveyor has a reduction gearbox, you’ll add that into the formula as follows:

Speed = roller circumference x motor RPM/gear ratio

Multiply the roller circumference and motor speed, then divide the result by the gearbox ratio.

Use a tachometer

Don’t want to mess with calculators and formulas? Use a tachometer for quick and easy belt speed measurements. A tachometer is a portable speed-sensing device that reads revolutions per minute (RPM) or surface feet per minute (FPM) with a simple wheel attachment. 

Follow these simple steps to use a tachometer for accurate belt speed tests:

1. Get a handheld tachometer with a wheel or surface speed attachment.
2. Clean a section of the belt about several feet long using a mild solvent cleaner to remove any oil or dirt buildup. This ensures proper friction and traction.
3. Press the tachometer’s wheel firmly to the cleaned section of the belt. Avoid getting hands near moving parts.
4. Engage the belt and run it at normal speed. The tachometer wheel will rotate with the belt movement.
5. Read the tachometer display. It should show the belt surface speed in units like feet per minute (FPM), miles per hour (MPH), or meters per second.
6. Verify accuracy by taking 2-3 readings in different belt sections and averaging the results. The readings should be fairly consistent.
7. Compare the tachometer speed to the calculated speed or rated speed from the conveyor specifications as a cross-check.

Talk to the manufacturer

Another way to find the speed of your conveyor belt: contact the manufacturer and ask. Here at Fluent Conveyors, we’re here to answer any questions you have, whether about maintenance, belt speed, or any other topic. 

Conveyor speed FAQ

How to convert feet per minute into miles per hour?

You can convert your belt’s speed in feet per minute to miles per hour using the following computations:

1. Take the belt speed in linear feet per minute (ft/min)
2. Convert minutes to hours by dividing by 60 minutes per hour
3. Convert feet to miles by dividing by 5280 feet per mile

For example, if a conveyor belt is moving at 500 ft/min:

Belt speed (mph) = 500 ft/min x (1 hr / 60 min) x (1 mile / 5280 ft)

= 500 x (1/60) x (1/5280)

= 0.094 mph

So in this example, 500 ft/min converts to 0.094 mph.

How to convert feet per minute into meters per second?

Here is a formula to convert a conveyor belt's speed from feet per minute (fpm) to meters per second (m/s):

Belt speed (m/s) = Belt speed (fpm) x (0.3048) x (1/60)

• 0.3048 is the conversion factor from feet to meters
• 1/60 converts minutes to seconds

For example, if a conveyor belt is moving at 500 feet per minute:

Belt speed (m/s) = 500 x 0.3048 x (1/60) = 2.54 m/s

500 feet per minute (fpm) converts to 2.54 meters per second (m/s).

How does belt tension relate to speed?

Proper belt tension is important for power transmission and preventing slippage. Over-tensioning belts can stretch them excessively and damage bearings. Too little tension causes slipping. Extreme situations can indirectly impact belt speed but generally, tension is adjusted independently from speed.