Result area
Submit the form to show the compliance result here, above the calculator form.
Calculator Form
Formula Used
Gross Load = Load Weight + Rigging Weight + Hook Block Weight
Dynamic Adjusted Load = Gross Load × (1 + Dynamic Factor / 100)
Available Capacity = Rated Capacity × (Derating Factor / 100)
Capacity Utilization % = Dynamic Adjusted Load ÷ Available Capacity × 100
Wind Utilization % = Actual Wind ÷ Allowed Wind × 100
Ground Utilization % = Actual Ground Pressure ÷ Allowable Pressure × 100
Clearance Coverage % = Actual Clearance ÷ Required Clearance × 100
Load Moment = Dynamic Adjusted Load × Working Radius
The score is a planning indicator from 0 to 100. It rewards better operating margin and penalizes values that approach or exceed the entered limits.
This calculator is a planning screen only. Final lift planning should still follow the crane manufacturer chart, rigging design, site engineering review, and project procedures.
How to Use This Calculator
- Enter the project details, crane model, boom length, and working radius.
- Type the rated capacity for that radius from the approved load chart.
- Add the lifted item weight, rigging weight, and hook block weight.
- Enter a dynamic factor and a derating factor that match your planning basis.
- Provide actual wind, allowable wind, actual ground pressure, and allowable ground pressure.
- Enter actual clearance and the minimum required clearance for the lift path.
- Press Submit Compliance Check to show the result above the form.
- Review the pass table, planner alerts, reserves, and the chart.
- Use the CSV or PDF buttons to export the current calculation report.
Example Data Table
| Item | Sample Value | Notes |
|---|---|---|
| Project name | Tower Core Pour | Sample reporting field |
| Lift ID | LP-017 | Reference number |
| Crane model | 90T Mobile Crane | Sample equipment |
| Boom length | 32 m | Entered planning value |
| Working radius | 14 m | Entered planning value |
| Rated capacity | 12,000 kg | Chart value at radius |
| Load + rigging + hook | 7,000 kg | Gross load |
| Dynamic adjusted load | 7,700 kg | With 10% dynamic factor |
| Available derated capacity | 10,200 kg | With 85% derating factor |
| Capacity utilization | 75.49% | Within limit |
| Wind utilization | 64.29% | 18 km/h of 28 km/h |
| Ground utilization | 72.00% | 180 kPa of 250 kPa |
| Clearance coverage | 125.00% | 7.5 m over 6 m requirement |
| Load moment | 107,800 kg·m | Dynamic adjusted load × radius |
| Compliance result | PASS | All mandatory checks passed |
FAQs
1. What does the compliance status mean?
PASS means every mandatory numeric check met the entered limit. REVIEW REQUIRED means at least one key item exceeded its threshold or clearance fell below the minimum.
2. Does this replace the crane load chart?
No. This page is a planning aid. Final lift approval should still use the manufacturer chart, rigging design, site review, and competent supervision.
3. Why is a dynamic factor included?
Dynamic factor adds allowance for motion, hoisting effects, or site handling conditions. It helps convert static weight into a more conservative planning load.
4. What derating factor should I enter?
Use the reduction method required by your project, engineering basis, or procedure. The calculator accepts your chosen factor but does not prescribe one universal percentage.
5. How should wind limit be selected?
Use the applicable operating limit from the crane documentation, lift plan, or site rule. Different boom lengths, loads, and attachments can change the accepted limit.
6. Why does ground pressure matter so much?
A lift can look acceptable on capacity and still fail at the support level. High bearing pressure can overload mats, soil, slabs, or underground services.
7. Does clearance coverage handle power line rules?
It only checks the numeric distance you enter. You must still apply the correct legal, utility, and project clearance requirement for the actual hazard.
8. When should a lift plan be revised?
Revise it whenever any check fails, margins become tight, weather changes, the radius changes, rigging changes, or site support conditions are updated.