How to Calculate Lifting Capacity

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As suggested by the name, the lifting capacity of a machine refers to the maximal weight that it can safely lift. For optimal results when it comes to using a crane, be sure to identify its lifting capacity. Failing to do so can result in serious damage to the machine or even serious injury.

    Multiply the impact allowance factor by the load capacity of the main wheel on the machine in question. A main wheel that provides a load capacity of 100 tons and an impact factor of 1.15, for example, would have an equation of 100 x 1.15 = 115. Divide this number by the common factor of 2 for, in this example, a total of 57.5.

    Determine the combined weight of the trolley and hoist of the machine in question in tons, and divide by the common factor of 2. Add this number to answer obtained in step 1. If you are calculating the lifting capacity of a machine whose trolley and hoist have a combined weight of two tons, the equation would be 57.5 + (2/2) = 58.5.

    Divide the total weight of the machine in question by the common factor of 4, and add to the answer obtained in step 2. To ensure optimal results when it comes to calculating lifting capacity, machine weight should be measured in tons. If you are calculating the lifting capacity of a machine that weighs 4 tons, the equation would be 58.5 + (4/4) = 59.5. The total lifting capacity of the machine is 59.5 tons.

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About the Author

Kathryn Vera holds a master's degree in exercise physiology, as well as licensure as a Registered Dietitian. Currently, she works as a Clinical Exercise Physiologist in Cardiac Rehabilitation, where she provides care to patients living with chronic heart disease.

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  • David De Lossy/Photodisc/Getty Images

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