SettingsSettings for this calculationUS
Read from YOUR crane's chart, at this radius and configuration.
Capacity is specific to the machine, the boom length, the radius, the counterweight, the outrigger extension and whether it is on tyres or fully set up. This calculator will not generate it — the chart for the actual machine is the only valid source, and a figure taken from a different configuration is a wrong number that looks right.
Mass of the item being lifted.
Verify it. A drawing weight, a delivery note and the actual item disagree more often than anyone expects, and water in a vessel or trapped in a section is a classic overload.
Slings, shackles, spreader beam, lifting frame.
A spreader beam is frequently several hundred kilograms on its own and is the item most often left out of the sum.
The block reeved on the machine.
Deducted from capacity on most charts. Include the auxiliary head or jib too, whether or not it is in use — it is on the boom either way.
Allowance for wind and dynamic effects.
Wind on a large flat load can be very large, and it acts on the surface area, not the mass — a light panel can be the harder lift. Above the manufacturer's stated wind speed the lift stops, and no percentage allowance substitutes for that limit.
Chart utilisation
70.8 %
Within capacity for the chart figure entered. This is arithmetic, not a lift plan.
- Gross lifted load
- 12,485 lb
- Rated capacity
- 17,635 lb
- Margin remaining
- 5,150 lb
- Load alone as a share of capacity
- 56.25 %
- Rigging, block and allowance
- 2,565 lb
- Gross load in tonnes
- 5.66 t
They open the calculator with your figures already in it
Crane Lift Utilisation Calculator: 70.8 % — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Rated capacity is read from the crane's own load chart for the specific configuration, radius and boom length — it is not derived here
- ASME B30.5 and common practice: gross load includes the load, all rigging, the hook block, and any jib or auxiliary head, whether in use or not
Inputs used
- Rated capacity from the load chart
- 17635 lb
- Load mass
- 9920 lb
- Rigging mass
- 550 lb
- Hook block and ball
- 880 lb
- Dynamic and wind allowance (%)
- 10
Intermediate steps
- Gross lifted load
- 12,485 lb
- Rated capacity
- 17,635 lb
- Margin remaining
- 5,150 lb
- Load alone as a share of capacity
- 56.25 %
- Rigging, block and allowance
- 2,565 lb
- Gross load in tonnes
- 5.66 t
Confidence note: Within capacity for the chart figure entered. This is arithmetic, not a lift plan.
What this calculation does not cover
- This is arithmetic on figures you supply, not a lift plan and not an engineering approval. A lift plan covers ground bearing, proximity hazards, exclusion zones, wind limits, the rigging arrangement and the sequence — none of which is here.
- Rated capacity must come from the chart for the actual machine in the actual configuration. Radius, boom length, counterweight and outrigger extension each change it, sometimes dramatically.
- Wind is not modelled. It acts on the load's surface area rather than its mass, and a large light panel can be a harder lift than a small heavy one. The manufacturer's wind limit is a stop, not a factor.
- Ground bearing pressure under outriggers or tracks is a separate and frequently governing check.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-27 · in the site-wide review of 2026-09-06 · v1.1.0
Regulatory standards & verification citations2
- Rated capacity is read from the crane's own load chart for the specific configuration, radius and boom length — it is not derived here
- ASME B30.5 and common practice: gross load includes the load, all rigging, the hook block, and any jib or auxiliary head, whether in use or not
Cite this page
Your workspace
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