How to Determine the Capacity of Your Crane Rental Load

Crane Load Capacity
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Cranes vary in lifting capacity, and lifting capacity depends on boom length and boom angle. In the crane rental service, it is necessary to determine in advance the lifting capacity of the crane to be rented to avoid the crashing of the load to the ground.

 When a crane lifts a load above its capacity, the results can be dire. The load could fall to the ground and cause the crane to overturn. Therefore, the elevator is thought out to the smallest detail in advance. To safely operate a crane without dropping the load or damaging the equipment, the crane operator must understand how the crane’s lifting capacity is determined as a safety measure in case there is any changes on the site.

At the Crane Rental service of Dependable Crane, the crane operators understand that a slight mistake which result in irredeemable property damage or even worse. Therefore, they take every logical and feasible precaution to ensure that all lifts go as planned.

 The values ​​shown in the table are “Overall capacity” or “Rated capacity.” The actual load that the crane can lift is called the “actual lifting capacity.” The maximum load must never exceed the actual lifting capacity of the crane!

 Total lifting capacity must include the weight of anything mounted or stowed on the crane or suspended from the end of the boom. These are known as “Capacity deduction.”

 Construction projects involve countless details and logistics. And the crane load capacity is one of the most important calculations that can affect any construction project. You may need to find the crane’s capacity index using the capacity chart. The crane capacity index is calculated using this formula: (Average (radius x max (hC))) / 100.

Below is a step-by-step guide on how to calculate the load capacity of your crane before operation.

How to Determine Crane Load Capacity

  • Consult a professional/specialist

Before starting the use of crane rental during site operations, Crane operators unfamiliar with crane load capacity calculations should consult a professional or specialist before leaning on their calculations to guide the lifts. Many factors affect the lifting capacity, so the slightest mistake in calculations can lead to costly crane repairs and severe injury.

  • Identifying the devices

Before proceeding with the calculations, it is essential to understand specific devices that are to be used. The crane operator must consider the type of crane, whether the crane will move or stop under load, and whether there will be a need for lattice jib during the operation. These factors will help determine the machine’s ability to support weight and maintain stability during operation.

  • Measure geometric components

The geometry of the machine is essential in crane load calculation. The crane operator must know the machine’s geometry to be used to get a precise crane load calculation. The elements to be measured include hoist, boom, and the ground, which forms a triangle. The accurate measurement of the dimensions of this resulted triangle will enable you to have an accurate crane load calculation.

Standard calculation of maximum crane lifting capacity: (r) (hC) / 100

 R = radius between ground and load

 h = lifting height

C = lifting capacity

hC= lifting height multiplied by lifting capacity

Based on the specific crane you are using, this equipment may be gotten or shipped with a handy load chart that estimates the crane’s lifting capacity without any particular calculations. Crane operators should check that the machine is supplied with instructions and that the instructions/guide are consulted before each job.

Crane lifting charts are an essential resource a crane operator must know to ensure crane safety and determine what a particular crane can lift at any given time and what moment. The crane lifting capacity diagram is well understood.

 Crane lifting capacity chart showing the lifting capacity detailing its characteristics and how its lifting capacity varies with distance, angle, and length.

 Before renting, transporting, leasing, or purchasing a crane, consult the crane table to deduce the suitable crane for the task at hand.

How Can You Determine Crane Net Capacity?

Here are concise ways to determine the net capacity in crane rental;

  • Dimensions and Weight

The crane dimensions, transport weight, outriggers data, and steering dimensions are displayed on the load chart. This data is essential for crane operators working in a tight space because the lifting capacity depends on ancillary equipment. Also, the transport weight affects some factors. These factors include trailer to use, load the crane onto the trailer, the transportation route,  and the type of permit to get for the job. In the load diagram, the first number on the top axle represents the vehicle’s total weight. At the same time, the other columns show the load for each shaft.

  • Crane Lift Range, stroke, and Angle

 Range charts include the lifts charts to show how much boom length is needed to lift a load to any distance or height. Lift angle is the maximum height when using a hanging box or fixed boom. The term “crane in motion” refers to the lifting and transport of the crane. The load graph shows the total weight lifted at 360 degrees at rest. The total weight can support both the rolling load at 0° and the total weight while driving.

  • Lifting capacity

 The glossary specifies the specific lifting work to be carried out by the crane. The left foot denotes the distance (or radius) from the center pin to the load’s center to plot the lift. Remember to continuously measure the maximum power for the shortest lift, usually at the rear of the crane load with fully extended external outlets.


Understanding your equipment is one of the significant keys to safe and successful construction crane operation. If you are a newbie in crane operation and need a specialist or professional help, contact us at Crane Rental service of Dependable Crane today to learn more about our premium crane lifting services and installations.

Danny Matranga

Danny Matranga

Danny has been in the crane industry for well over 22 years.. He enjoys racing dwarf cars and wake surfing.

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