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Learn how to calculate conveyor roller load using load weight, roller spacing, belt width, load distribution and conveyor layout, with practical formulas and examples for roller selection.
Conveyor roller load is the amount of weight transferred to an individual roller by the product moving on the conveyor.
A product is normally supported by several rollers at the same time. Therefore, the total product weight is distributed across the rollers that are positioned beneath the product.
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The basic roller load calculation divides the total product weight by the number of rollers supporting the product at the same time.
Where:
Total Product Weight = weight of the product or load being conveyed.
Supporting Rollers = rollers directly supporting the product.
Use the following example to calculate the average static load carried by each supporting roller.
Product Length ÷ Roller Pitch 900 ÷ 150 = 6 rollers
Product Weight ÷ Supporting Rollers 150 ÷ 6 = 25 kg per roller
Note: This is an average static-load calculation. Actual roller selection should also consider load distribution, product geometry, impact, roller length, tube construction, shaft and bearing capacity.
Roller load depends on how many rollers are positioned beneath the product. Product length and roller pitch are therefore important inputs when estimating the number of supporting rollers.
A smaller roller pitch generally allows more rollers to support the product at the same time. This can reduce the average load carried by each roller. A larger pitch can reduce the number of supporting rollers and increase the average load per roller.
For unit-load conveyor design, the product should remain supported by multiple rollers throughout its movement. The exact roller pitch should be selected according to the product dimensions, weight and conveyor application.
Enter the product weight, product length and roller pitch to estimate the number of supporting rollers and average load per roller.
SELECT BY: load • speed • environment
Roller diameter is one of the factors considered when selecting a conveyor roller for a calculated load. However, diameter alone does not determine the complete load capacity of the roller.
Important: Do not select a roller based only on product weight or diameter. The complete roller assembly should be checked for the required load, length, speed and operating conditions.
SELECT BY: load • speed • environment
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Click a problem to open its inspection guidance.
Recalculate the load per roller and verify the roller’s rated capacity
Check product base dimensions, roller position and load distribution
Reduce roller pitch so more rollers support the product
Check roller construction and select a suitable tube and diameter
Recalculate shaft loading and select an appropriate shaft size
Check bearing load, speed, sealing and operating environment
Conveyor roller load can be estimated by dividing the total product weight by the number of rollers supporting the product at the same time.
Formula:Load Per Roller = Total Product Weight ÷ Number of Supporting Rollers
The main inputs are product weight, product length, roller pitch, and the number of rollers supporting the product. For final roller selection, product width, roller length, conveyor speed, impact conditions, shaft and bearing details should also be considered.
Yes. A smaller roller pitch generally allows more rollers to support the product, reducing the average load carried by each roller.
Not necessarily. The simple calculation assumes an average distribution. Actual load distribution depends on product rigidity, weight distribution, contact area, roller position and conveyor geometry.
A basic estimate can be made using product length and roller pitch. However, the actual number of rollers supporting a product depends on the product footprint and the position of the product on the conveyor.
No. Roller load capacity depends on the complete roller construction, including tube diameter, tube thickness, roller length, shaft diameter, bearings and operating conditions.
Yes. Loading, dropping or transferring products onto rollers can create loads higher than the normal static product weight. Impact conditions should therefore be considered separately when selecting rollers.
The roller specification should be reviewed. Depending on the application, you may need to reduce roller pitch, increase roller diameter or tube thickness, increase shaft size, select suitable bearings, or use a roller designed for higher loading conditions.
Technical note: Final roller selection should be verified against the conveyor manufacturer’s design data and the applicable component load, speed and environmental ratings.
