Max Working Radius — Max Radius for a Load
Maximum radius at which a tower crane can place a given gross load, from its tonne-metre rating.
The planner's inverse question: with this load, how far can I reach? Dividing rated moment by gross load (then trimming ~5% for the trolley and hook tackle the chart already ate) gives the answer that decides whether the crane base moves or the loading bay does.
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.
Maximum radius at which a tower crane can place a given gross load, from its tonne-metre rating. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Max Working Radius — Max Radius for a Load
Max Working Radius — Max Radius for a Load computes the governing relationship r_max ≈ M_rated × (1 − trim) / W live as you type. The planner's inverse question: with this load, how far can I reach? Dividing rated moment by gross load (then trimming ~5% for the trolley and hook tackle the chart already ate) gives the answer that decides whether the crane base moves or the loading bay does. 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 Max Working Radius — Max Radius for a Load
- 1Enter your values — Rated load moment, Gross load, Tackle/trolley trim (sensible defaults are pre-filled).
- 2Read the live results: Maximum radius.
- 3Check the "with your numbers" line to see r_max ≈ M_rated × (1 − trim) / W substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Max Working Radius — Max Radius for a Load?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula r_max ≈ M_rated × (1 − trim) / W with authoritative sources cited on the page (EN 13001 / EN 14439 — Crane design & tower crane standards; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices)
- ✓The planner's inverse question: with this load, how far can I reach? Dividing rated moment by gross load (then trimming ~5% for the trolley and hook tackle the chart already ate) gives the answer that decides whether the crane base moves or the loading bay does.
- ✓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 max working radius — max radius for a load use?+
It evaluates r_max ≈ M_rated × (1 − trim) / W, exactly as published. Sources: EN 13001 / EN 14439 — Crane design & tower crane standards; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices. 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?+
The planner's inverse question: with this load, how far can I reach? Dividing rated moment by gross load (then trimming ~5% for the trolley and hook tackle the chart already ate) gives the answer that decides whether the crane base moves or the loading bay does. 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?+
Maximum radius at which a tower crane can place a given gross load, from its tonne-metre rating. A free crane load, wind & rigging safety tool. The planner's inverse question: with this load, how far can I reach? Dividing rated moment by gross load (then trimming ~5% for the trolley and hook tackle the chart already ate) gives the answer that decides whether the crane base moves or the loading bay does. 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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