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Horizontal Distance Multiplier Factor

How can the horizontal distance affect the weight limit?

Example: A worker lifts 15 kg boxes from the table to the shelf five times an hour. Notice that there is a barrier between the worker and the box.

How horizontal distance can affect the weight limit

To calculate the recommended weight limit (RWL) for the task:

  • Determine the weight of the load.

Weight - 15 kg

H (Horizontal Distance) - 50 cm
V (Vertical Distance) - 75 cm
D (Lifting/ carrying Distance) - 40 cm
F (Frequency) - 12 min
A (Angle) - 0°
C (Coupling/quality of grip) - fair

23 Kg x 0.50 x 0.93 x 0.93 x 1.00 x 1.00 x 1.00 = 9.95 kg

  • Compare the weight of the load against determined Recommended Weight Limit for the task.


The weight of the load is 15 kg. This value is higher than the weight limit of 9.95 kg.

Therefore, the TASK IS DANGEROUS.


The critical component is H, the horizontal distance of the box from worker's body.

  • Remove the barrier to allow worker to get closer to the box (horizontal distance is now 30 cm which uses a factor of 0.83).
Removing the barrier allows worker to get closer to the box

Evaluate the Redesigned Task

23 kg x 0.83 x 0.93 x 0.93 x 1.00 x 1.00 x 1.00 = 16.51 kg

  • Compare weight of the load against Weight Limit in new layout.

The weight of the load at 15 kg is now lower than the recommended weight limit of 16.51 kg.


Document last updated on July 4, 2016

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