Load per caster with safety factor = (total load × safety factor) / number of casters

“Total Load” is the equipment’s net weight(E) plus material weight (Z)

“Safety Factor” is an additional weight allowance added to the calculated load per caster to ensure that the casters can handle unexpected or temporary overloads, variations in load distribution, and wear & tear over time. It typically ranges from 1.0 to 3.0, although the specific value can vary depending on the application and industry standards. A common safety factor of caster calculation is 1.33 (or 33%).

• Safety factor: 1.0 to 1.5, for indoor manual transport, when the height of the obstacles is smaller than 5 % of the wheel diameter. 
• Safety factor: 1.5 to 2.2, for Outdoor manual transport, when the height of the obstacles is bigger than 5 % of the wheel diameter
• Safety factor: 1.4 to 2.0, for indoor power-driven transport, when the height of the obstacles is smaller than 5 % of the wheel diameter
• Safety factor: 2.0 to 3.0, for outdoor power-driven transport