Work out crane load chart check instantly with clear inputs, formula shown and shareable results.
Crane capacity is quoted net at each radius, so everything between the hook and the load counts against it: hook block, slings, spreader beams and any jib attachment. Adding those deductions to the load gives the gross figure to compare with the chart. Above ninety percent utilisation most standards require a detailed lift plan.
Gross load
Gross = load + hook block and rigging deductions
Utilisation
Utilisation = gross load / rated capacity at the working radius
Preliminary estimate only. Lifting operations must be planned by an appointed person using the crane manufacturer's load chart and site-specific ground bearing assessment.
Gross = load + hook block and rigging deductions. Crane capacity is quoted net at each radius, so everything between the hook and the load counts against it: hook block, slings, spreader beams and any jib attachment.
Stability and structural moment. Capacity is governed by the overturning moment, which is load times radius, so doubling the radius roughly halves the load the crane can hold.
This calculator takes 4 inputs: Load to be lifted, Working radius, Rated capacity at this radius, Hook block, rigging and jib deductions. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.