Crane Lift Plan Compliance Calculator

• Total static load (t) = Load + Rigging + Hook block + Attachments
• Dynamic multiplier = 1 + (Dynamic factor % / 100)
• Effective load (t) = Total static load × Dynamic multiplier
• Available capacity (t) = Chart capacity at radius × (1 − Derate % / 100)
• Utilization (%) = (Effective load ÷ Available capacity) × 100
• Ground pressure (kPa) = Outrigger reaction (kN) ÷ Pad area (m²)
• Checklist score (%) = (Points achieved ÷ Points available) × 100

1. Enter the lifted load and all attached weights.
2. Pull the chart capacity for the planned radius.
3. Add a dynamic factor and any project derate.
4. Optional: enter outrigger and ground bearing details.
5. Optional: enter clearance and wind planning limits.
6. Complete the readiness checklist using verified information.
7. Submit to get compliance status, notes, and actions.
8. Download the CSV or PDF for your lift file.

1) Define lift scope and criticality

Start with scope: load type, travel path, pick and set points, and nearby hazards. Treat lifts as higher risk when moving over people, near live services, or with tight access. Record the lift ID, key roles, and approvals so controls stay traceable across shifts.

2) Build a conservative load estimate

Total lifted weight includes the load, rigging, hook block, and attachments. Add a dynamic allowance for acceleration, handling, and minor gust effects. The calculator uses 1 + (dynamic % / 100) to estimate an effective planning load.

3) Use chart capacity at the planned radius

Capacity must come from the manufacturer chart for your configuration: boom length, counterweight, parts of line, and outrigger setting. Enter the chart capacity at working radius, then apply any project derate. Available capacity = chart capacity × (1 − derate % / 100).

4) Manage utilization and planning limits

Utilization is effective load ÷ available capacity. Many teams plan below 85% to allow for measurement error and site variability. The calculator flags utilization above 85% as noncompliant for planning unless an engineered review justifies it. Record the margin to support shift handover decisions.

5) Check ground bearing and outrigger support

When reactions are known, ground pressure = reaction (kN) ÷ pad area (m²). Since 1 kN/m² equals 1 kPa, compare directly to bearing capacity. Verify levelness, cribbing condition, and pad placement under each outrigger. If pressure is high, increase mat area or improve support.

6) Control clearance and overhead hazards

Enter required and planned clearance for a simple pass/fail. If clearance is tight, reroute, isolate services, or add spotters. Use physical markers and defined corridors to keep boom and load within limits. Written controls reduce drift during repositioning and help maintain consistent communication.

7) Apply weather and wind constraints

Wind increases swing and reduces control. Use a site wind limit that matches equipment and lifted surface area, then compare to expected conditions. Log gusts, precipitation, and visibility that could affect signaling. If wind exceeds the limit, delay the lift or strengthen controls.

8) Verify readiness with a weighted checklist

The readiness checklist weights inspections, qualified roles, barricades, communications, and a pre-lift meeting. Target ≥80% before execution. Re-score after changes, such as crew swaps, route updates, or revised rigging. Lower scores point to gaps you can close before the crane starts moving.

1) What does “utilization” mean here?

Utilization is the effective lifted load divided by the available chart capacity, expressed as a percentage. It helps you see how close the plan is to the selected crane configuration limits.

2) Why is the planning threshold set to 85%?

Planning below 85% adds margin for uncertainty such as weight tolerances, radius drift, minor dynamic effects, and site variability. Your organization may adopt a different limit based on policy or engineering review.

3) Should I always add a dynamic factor?

Yes, when conditions warrant it: rapid starts/stops, lifting with wind exposure, load snag risk, or limited control. If the lift is slow and stable, a smaller factor may be justified by your procedure.

4) What if I do not know outrigger reactions?

You can still evaluate utilization and checklist readiness. Ground pressure checks are optional and only applied when reaction, pad area, and bearing capacity are provided. For critical lifts, obtain reactions from the manufacturer or engineer.

5) How do I choose pad or mat area?

Use the actual mat footprint that transfers load to the ground under each outrigger. Larger mats reduce pressure. Confirm mat condition, placement, and subgrade preparation to ensure the effective area is realistic.

6) Can the calculator replace a formal engineered lift plan?

No. It supports structured planning and documentation, but it is not a substitute for manufacturer instructions, engineered rigging design, or regulatory requirements. Use it to standardize checks and highlight gaps early.

7) Why does the checklist affect overall compliance?

Many lift failures are process-related, not purely capacity-related. Roles, inspections, communications, and exclusion zones are critical controls. The checklist score helps ensure execution readiness is measured, not assumed.

• This tool supports planning checks, not engineering certification.
• Capacity utilization target is set to 85% for planning conservatism.
• Optional checks only apply if you enter required fields.
• Always follow manufacturer instructions and local regulations.