Lift Planning — Drop/Exclusion Zone Radius
Drop/Exclusion Zone Radius for engineered lift planning.
Dropped loads don't land under the hook — they bounce, deflect off structure and shed parts sideways; the height multiplier encodes that physics. The zone follows the load PATH, not the pick point: walking a panel across a live work area moves the exclusion with it, or the lift waits for break time.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Drop/Exclusion Zone Radius for engineered lift planning. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Lift Planning — Drop/Exclusion Zone Radius
Lift Planning — Drop/Exclusion Zone Radius computes the governing relationship R = load dimension + height × site factor live as you type. Dropped loads don't land under the hook — they bounce, deflect off structure and shed parts sideways; the height multiplier encodes that physics. The zone follows the load PATH, not the pick point: walking a panel across a live work area moves the exclusion with it, or the lift waits for break time. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Lift Planning — Drop/Exclusion Zone Radius
- 1Enter your values — Max load height, Largest load dimension, Site factor (sensible defaults are pre-filled).
- 2Read the live results: Exclusion radius from load path.
- 3Check the "with your numbers" line to see R = load dimension + height × site factor substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Lift Planning — Drop/Exclusion Zone Radius?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula R = load dimension + height × site factor with authoritative sources cited on the page (ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction; DNV-ST-N001 — Marine operations (DAF methodology))
- ✓Dropped loads don't land under the hook — they bounce, deflect off structure and shed parts sideways; the height multiplier encodes that physics.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the lift planning — drop/exclusion zone radius use?+
It evaluates R = load dimension + height × site factor, exactly as published. Sources: ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction; DNV-ST-N001 — Marine operations (DAF methodology). The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Dropped loads don't land under the hook — they bounce, deflect off structure and shed parts sideways; the height multiplier encodes that physics. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Drop/Exclusion Zone Radius for engineered lift planning. A free crane load, wind & rigging safety tool. The zone follows the load PATH, not the pick point: walking a panel across a live work area moves the exclusion with it, or the lift waits for break time. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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