How to Calculate Caster Wheel Load Capacity for Carts, Furniture and Equipment

Understand Static Load and Dynamic Load

Load capacity is one of the most important specifications when choosing caster wheels. If the caster is under-specified, the equipment may become difficult to move, the wheel may wear quickly, the bracket may deform or the floor may be damaged.

Static load means the weight a caster supports when the equipment is not moving. Dynamic load means the weight a caster supports while the equipment is moving. Dynamic load is usually more demanding because the caster may experience vibration, floor joints, turning force, impact and uneven weight distribution.

Use a Practical Load Capacity Formula

A common calculation method is: required load per caster equals total loaded weight multiplied by safety factor, divided by the number of load-bearing casters.

For four-caster equipment, many buyers calculate based on three load-bearing casters because floor unevenness can shift weight distribution. For example, if equipment and cargo together weigh 300 kg, with a 1.3 safety factor and three load-bearing casters, the required load per caster is 130 kg.

• Equipment weight: 80 kg.
• Maximum cargo weight: 220 kg.
• Total loaded weight: 300 kg.
• Safety factor: 1.3.
• Required load per caster: 300 x 1.3 / 3 = 130 kg.

Choose a Safety Factor Based on the Application

The safety factor is used to reduce risk. It is not a fixed universal number because different applications face different working conditions.

Light furniture may need a moderate safety margin. Medical carts may need stable movement and reliable braking. Industrial trolleys often need a higher margin because loads can be uneven and movement may be frequent.

Consider Floor Condition and Wheel Diameter

Floor condition strongly affects caster performance. A caster that works well on a smooth showroom floor may not perform the same way on rough concrete or uneven factory flooring.

Larger wheels generally roll more easily over small obstacles and floor gaps. Smaller wheels are compact and may suit furniture or low-profile equipment, but they can have higher rolling resistance under load.

• Smooth tile or epoxy floors are easier for rolling performance.
• Wood floors may need floor-friendly tread material.
• Concrete floors may require stronger wheels and higher wear resistance.
• Floor gaps or thresholds may require larger wheel diameter.

Check Mounting Type and Sample Performance

Caster load capacity is not only about the wheel. The mounting structure must also match the equipment. If the mounting point is weak, even a strong caster may not perform correctly.

Sample testing should include loaded rolling, turning, brake operation, floor protection, mounting fit, stability and surface inspection. For export orders, sample approval should be documented before bulk production.

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