How OSHA regulates crane lifts in construction
Cranes and derricks in construction are governed by 29 CFR 1926 Subpart CC. The rule this calculator centers on is 29 CFR 1926.1417(o)(3): on every lift, the operator must verify that the load is within rated capacity, either from a source or calculation recognized by the industry, or by starting the hoist with a load-weighing device or rated capacity indicator. With that second method, a reading that exceeds 75 percent of the maximum rated capacity at the longest radius means the lift stops until the weight is verified the first way. OSHA's only hard ceiling is that you must never exceed the manufacturer's rated capacity (100%) shown on the load chart for the actual configuration and radius.
OSHA does not mandate a written plan for every single-crane lift, but it does require a plan developed by a qualified person for multiple-crane lifts 29 CFR 1926.1432. The 75% / 90% planning lines this tool uses for "critical" and "prohibited" come from industry consensus practice (ASME B30.5 and USACE EM 385-1-1), not from a CFR number — they are the recognized standard of care, and a documented lift plan is best practice for any critical lift.
Capacity utilization risk bands
Utilization is the wind-adjusted total load (load + rigging) divided by the rated capacity at radius. The calculator assigns one of four bands:
| Risk band | Utilization | What it means | Basis |
|---|---|---|---|
| Low | < 50% | Routine lift, ample margin. | Best practice (ASME B30.5) |
| Moderate | 50–74% | Routine lift; verify load-chart values and configuration. | Best practice (ASME B30.5) |
| Critical | 75–90% | OSHA 1926.1417(o)(3) requires the operator to verify every load is within rated capacity; if that check is done by hoisting with a load-weighing device or indicator and the reading exceeds 75 percent of the maximum rated capacity at the longest radius, the lift stops until the weight is verified from an industry-recognized source or calculation. Industry practice (ASME B30.5) treats this as a critical lift warranting enhanced planning; a documented plan by a qualified person is OSHA-required only for multiple-crane lifts (1926.1432). | OSHA 1926.1417(o)(3) + ASME B30.5 |
| Prohibited (best practice) | > 90% | Above the best-practice planning ceiling. OSHA's hard limit is never exceeding 100% of the manufacturer's rated capacity. | Best practice (ASME B30.5 / USACE EM 385-1-1) |
The 75% line is where 29 CFR 1926.1417(o)(3) stops a lift checked with an indicator; it is not what triggers the verification, which applies to every lift. The 90% line and the "routine" ceiling are ASME B30.5 / USACE EM 385-1-1 best practice. Always defer to the manufacturer's load chart.
The numbers that drive the verdict
- Total load = load weight + rigging weight. Every sling, shackle, spreader bar, and hook block hangs on the hook and counts against capacity. A typical rigging deduction is 3–10% of the load.
- Rated capacity is read AT the operating radius for the actual boom length and configuration. Capacity drops sharply as radius increases, so a chart value read at the wrong radius is the most common planning error.
- Wind reduces capacity. Enter the wind derate from the manufacturer's load chart; with none entered, the result carries no wind adjustment and says so, because 29 CFR 1926.1417(n) leaves the adjustment to the competent person and fixes no percentage. Read the manufacturer's wind-derate table before lifting.
Worked examples
Steel beam on a 90-ton hydraulic crane (critical lift). A W24×76 beam weighs 17,100 lbs; rigging (spreader bar + 4 slings + shackles) adds 1,900 lbs, for a 19,000-lb total load. At the planned 40 ft radius the load chart shows a rated capacity of 24,000 lbs. Utilization = 19,000 ÷ 24,000 = 79.2%. OSHA 1926.1417(o)(3) requires verifying the load is within rated capacity, as on every lift; checked with a load-weighing device or indicator, a reading above 75% means stopping until the weight is verified from the beam's published weight or a calculation. Industry best practice (ASME B30.5) treats a lift this heavy as a 'critical lift' warranting a documented plan and a qualified signal person — but note that a documented plan by a qualified person is an OSHA requirement only for multiple-crane lifts (1926.1432), not for a single crane over 75%.
Wind turns a routine lift critical. Same 19,000-lb load, but the rated capacity at radius is 28,000 lbs → raw utilization 67.9% (moderate). The forecast is 24 mph wind. OSHA fixes no derate — 29 CFR 1926.1417(n) puts the adjustment on the competent person — so you read the manufacturer's wind-derate table and enter what it says. Enter 10% and effective capacity drops to 25,200 lbs, taking wind-adjusted utilization to 75.4% → CRITICAL. Enter nothing and the tool applies nothing: it will not guess a number that decides whether a lift is critical. Real load-chart reductions are frequently much larger than 10%.
What to do next
- Verify the load is within rated capacity on every lift, and stop any indicator check that reads above 75% 29 CFR 1926.1417(o)(3).
- Have a qualified person develop the plan for multiple-crane lifts 29 CFR 1926.1432, and a competent lift director oversee any critical lift.
- Check ground bearing and power-line clearance. Confirm the supporting surface and maintain the minimum clearance distances 29 CFR 1926.1408 before swinging the load.
- Brief and sign off the crew. The downloaded PDF includes a bilingual (EN/ES) sign-off sheet so the operator, signal person, and rigger acknowledge the plan before the lift.
Frequently asked questions
When is a crane lift plan required?
OSHA does not mandate a written lift plan for single-crane lifts, but it does require a plan developed by a qualified person for multiple-crane lifts (29 CFR 1926.1432). A written plan is industry best practice for any 'critical lift' — typically a lift over 75% of the crane's rated capacity, over occupied areas, or with multiple cranes. Separately, OSHA 1926.1417(o)(3) requires the operator to verify every load is within rated capacity; if that check is done by hoisting with a load-weighing device or indicator and the reading exceeds 75 percent of the maximum rated capacity at the longest radius, the lift stops until the weight is verified from an industry-recognized source or calculation.
Who is responsible for the crane lift plan?
The lift director (a competent person) develops and oversees the lift plan. For multiple-crane lifts, OSHA 1926.1432 requires the plan to be developed by a qualified person (with engineering expertise if needed). The crane operator, signal person, and rigger must all review and understand the plan before the lift.
What is the maximum safe working load percentage?
As an industry best practice (ASME B30.5, USACE EM 385-1-1), routine lifts are kept to 75% of the crane's rated capacity at the given radius and configuration; lifts between 75-90% are treated as critical and get enhanced planning; lifts above 90% are generally avoided. OSHA's hard rule is simply that you must never exceed the manufacturer's rated capacity (100%) on the load chart.
How do I account for rigging weight in a lift plan?
All rigging hardware (slings, shackles, spreader bars, hooks) must be subtracted from the crane's rated capacity. A typical rigging deduction is 3-10% of the load weight. The net capacity = rated capacity minus rigging weight.
What wind speed stops crane operations?
OSHA sets no general wind-speed limit for crane operations. 29 CFR 1926.1417(n) requires the competent person to adjust the equipment and/or operations for the effect of wind, ice and snow on stability and rated capacity, and the manufacturer's load chart carries the wind rating and derate. For lifting personnel only, 1926.1431(k)(8)(i) makes 20 mph at the personnel platform the point where a qualified person must decide whether the lift is still safe.
Sources & verification
- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-CC/section-1926.1417
- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-CC/section-1926.1432
- https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1417
- https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1432
Citations verified 2026-10-05 against the eCFR (NOT 1926.1417(e) — that paragraph governs leaving controls with a suspended load (unattended), not lift plans or load verification. In (o)(3), 75 percent is not a trigger: it is where the indicator method (ii) stops and hands over to method (i).). This calculator is an estimate for planning only — it is not legal advice and does not replace the manufacturer's load chart, a qualified person, or a site-specific lift plan. State-Plan states may have additional requirements.
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