Crane Lift Planning Calculator
Calculate safe working load at radius from boom length, angle, and crane capacity for marine lift operations.
Inputs
Results
Capacity at Radius
43.3 MT
≈ 8 elephants
Crane Utilization
50.8%
How to Use This Calculator
- Enter the crane's Safe Working Load (SWL) in metric tons and the boom length in meters.
- Input the working radius and boom angle in degrees for the planned lift.
- Enter the load weight and rigging weight in metric tons.
- Review crane capacity at radius, total lifted weight, and utilization percentage.
- Keep crane utilization below 80% and ensure safety margin is positive before proceeding.
How the result changes with Crane SWL (Max Capacity)
| Crane SWL (Max Capacity) | Capacity at Radius | Crane Utilization |
|---|---|---|
| 1,001 | 866.89 MT | 2.5% |
| 3,501 | 3,031.95 MT | 0.7% |
| 6,500 | 5,629.17 MT | 0.4% |
| 9,000 | 7,794.23 MT | 0.3% |
What each input means
- Crane SWL (Max Capacity)
- Maximum safe working load at minimum radius.
- Boom Length
- Total boom length.
- Working Radius
- Horizontal distance from crane center to load.
- Boom Angle
- Boom angle from horizontal.
- Load Weight
- Weight of the cargo being lifted.
- Rigging Weight
- Weight of slings, shackles, and lifting gear.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersCrane SWL (Max Capacity) = 50, Boom Length = 30, Working Radius = 15, Boom Angle = 60 = 6 input(s) provided
- Calculate Capacity at RadiusCapacity at Radius43.3 = 43.3
- Calculate Crane UtilizationCrane Utilization50.8 = 50.8
- Calculate Total Lifted WeightTotal Lifted Weight22 = 22
- Calculate Safety MarginSafety Margin21.3 = 21.3
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Cargo Stowage Calculator
Calculate cargo capacity from hold dimensions, stowage factor, and broken stowage allowance.
Commercial MarineContainer Weight Calculator
Calculate maximum container payload from tare weight and gross limits, with volume utilization check.
Performance ArtsRigging Load Calculator
Safe working load for aerial performance rigging points.
Precast ConcreteLifting Insert Design Calculator
Determine lifting insert count, capacity, crane size, and verify minimum stripping strength (2,500 psi) for precast panels.
Material HandlingCrane Load Chart Calculator
Crane capacity at radius from boom length and load.
More in Aviation, Marine & Transport.