Lift Type
Load Weight
t
Enter the actual load weight only.
Rigging Weight
t
Required. Total rigging weight (slings, shackles, spreader beam, accessories, etc.).
Hook Block Weight
t
Required. Enter the crane hook block weight.
Dynamic Amplification Factor (DAF)
×
Default 1.10 for dynamic lifts. Tap ▼ to select from sea state table. Minimum 1.00.
Crane Rated Capacity at Selected Radius
t
Enter the crane rated capacity at the selected working radius.
0%
Utilization
○
—
Static Load
—
tonne
Available
—
tonne
Safety Margin
—
%
Lift Category
—
—
⚠
Overload Warning
Crane utilization exceeds recommended limits. Do not proceed without engineering review.
Static Load = Load + Rigging + Hook Block
Dynamic Load = Static Load × DAF
Utilization % = (Dynamic Load ÷ Capacity) × 100
Colour Zones
0 – 70% — Safe operating range
70 – 90% — Caution / Critical lift planning required
90%+ — Danger / Not recommended
Reference Standards
ASME B30.5
ASME B30.9
OSHA 1926.1400
ISO 4301
API RP 2D
DNV
Based on industry practice for planning-level crane utilization checks. Not a substitute for manufacturer load charts or project-approved procedures.
ENGINEERING DISCLAIMER: This tool provides a planning estimate only. Always verify rated capacity from the manufacturer’s load chart at the actual radius, boom length, configuration and duty cycle. Dynamic factors must follow your company / client approved lifting procedure. Final approval by a competent person / appointed person is mandatory before any lift.
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