Crane Load Chart Check Calculator

Work out crane load chart check instantly with clear inputs, formula shown and shareable results.

About Crane Load Chart Check Calculator

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.

Formulas

Gross load

Gross = load + hook block and rigging deductions

Utilisation

Utilisation = gross load / rated capacity at the working radius

Worked example

With the default values below, Crane Load Chart Check Calculator returns Gross load on the crane of 5,400. Change any input above and every figure here is recalculated in your browser.

Inputs used

Load to be liftedminimum 0 kg: 5,000 kg
Working radiusminimum 0.5 m: 12 m
Rated capacity at this radiusminimum 1 kg: 6,500 kg
Hook block, rigging and jib deductionsminimum 0 kg: 400 kg

Results

Gross load on the crane: 5,400 kg
Utilisation of rated capacity: 83.08% %
Remaining capacity: 1,100 kg
Assessment: Duty lift — verify ground conditions and rigging

Step by step

1Values used
2Gross load
3Utilisation
4Gross load on the crane= 5,400 kg
5Utilisation of rated capacity= 83.08 %
6Remaining capacity= 1,100 kg
7Assessment= Duty lift — verify ground conditions and rigging

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
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.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

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.

Frequently Asked Questions

How is the Crane Load Chart Check figure worked out?

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.

Why does capacity fall with radius?

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.

What values do I need to enter?

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.