Tree Work
Crane Load Chart Calculator
Crane capacity drops sharply with reach. Enter the boom length, working radius, and the chart capacity at that configuration to see your safe lift after typical 75% derating.
Safe working lift (lb)
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- Chart capacity (lb)
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- Boom angle approx
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- Tip height approx (ft)
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FAQ
Why derate the chart? +
Manufacturer chart capacities assume ideal conditions: level ground, outriggers fully extended, no wind, perfect rigging. Most operators run 75-85% of chart to leave margin for real-world variables.
Why does radius matter so much? +
A crane lifting 25,000 lb at 30-ft radius might only lift 8,000 lb at 60-ft radius on the same boom. Stability and structural limits drop fast as you reach further from center.
What about boom angle? +
Higher boom angles (closer to vertical) give more capacity. Below 30° from horizontal, most cranes are at their structural limit regardless of capacity chart.