Crane Load Chart Calculator
Crane capacity at radius from boom length and load.
Inputs
Results
Capacity at radius (lb)
27,500
Utilization (%)38.18
Safe working load (lb)23,375
Net capacity (lb)27,000
Overloaded (0/1)0
Is Above Safe LimitNo
How to Use This Calculator
- Enter the crane's maximum rated capacity (lb) from the load chart at minimum radius.
- Set the current boom length (ft) for the configuration you are using.
- Enter the working radius (ft) — the horizontal distance from the crane's center of rotation to the load.
- Input the load weight (lb) and rigging weight (lb) to calculate total suspended load.
- Check Capacity at radius (lb) and Utilization (%) to confirm the lift is within the safe working load; a result of 1 in Overloaded means the lift must not proceed.
How the result changes with Max capacity (lb)
| Max capacity (lb) | Capacity at radius (lb) |
|---|---|
| 100,900 | 55,495 |
| 350,650 | 192,858 |
| 650,350 | 357,693 |
| 900,100 | 495,055 |
What each input means
- Max capacity (lb)
- Crane maximum rated capacity at minimum radius.
- Boom length (ft)
- Current boom length in feet.
- Working radius (ft)
- Horizontal distance from center of rotation to load.
- Load weight (lb)
- Weight of the load being lifted.
- Rigging weight (lb)
- Weight of rigging, block, and hook.
What each result means
- Capacity at radius (lb)
- Rated capacity at the working radius.
- Utilization (%)
- Total load as percentage of rated capacity.
- Safe working load (lb)
- 85% of rated capacity (common working limit).
- Net capacity (lb)
- Available capacity after rigging deduction.
- Overloaded (0/1)
- 1 = load exceeds rated capacity.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMax capacity (lb) = 50000, Boom length (ft) = 100, Working radius (ft) = 50, Load weight (lb) = 10000 = 5 input(s) provided
- Calculate Capacity at radiusCapacity at radius = round(capacityAtRadius)27500 = 27500
- Calculate UtilizationUtilization = round((totalLoad / roundedCapacity) * 10000) / 10038.18 = 38.18
- Calculate Safe working loadSafe working load = round(roundedCapacity * 0.85)23375 = 23375
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