Capacity Check — Loader (Knuckle-Boom) Crane
Gross-load vs chart utilization for a loader (knuckle-boom) crane, with rigging weight and dynamic allowance included.
Truck-mounted knuckle booms quote tonne-metres: 12 t·m means 1.2 t at 10 m, full stop. Every extension segment deployed drops capacity another step. The kerbside reality — stabilizers half-spread on a footpath — derates further; most loader tip-overs trace to exactly that half-spread.
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.
Gross-load vs chart utilization for a loader (knuckle-boom) crane, with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Capacity Check — Loader (Knuckle-Boom) Crane
Capacity Check — Loader (Knuckle-Boom) Crane computes the governing relationship gross = (net + rigging) × (1 + dynamic%) vs chart at radius live as you type. Truck-mounted knuckle booms quote tonne-metres: 12 t·m means 1.2 t at 10 m, full stop. Every extension segment deployed drops capacity another step. The kerbside reality — stabilizers half-spread on a footpath — derates further; most loader tip-overs trace to exactly that half-spread. 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 Capacity Check — Loader (Knuckle-Boom) Crane
- 1Enter your values — Net load, Rigging + block weight, Chart capacity at this radius/config, Dynamic allowance (sensible defaults are pre-filled).
- 2Read the live results: Gross design load, Chart utilization, Remaining margin.
- 3Check the "with your numbers" line to see gross = (net + rigging) × (1 + dynamic%) vs chart at radius substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Capacity Check — Loader (Knuckle-Boom) Crane?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula gross = (net + rigging) × (1 + dynamic%) vs chart at radius 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)
- ✓Truck-mounted knuckle booms quote tonne-metres: 12 t·m means 1.2 t at 10 m, full stop.
- ✓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 capacity check — loader (knuckle-boom) crane use?+
It evaluates gross = (net + rigging) × (1 + dynamic%) vs chart at radius, 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. 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?+
Truck-mounted knuckle booms quote tonne-metres: 12 t·m means 1.2 t at 10 m, full stop. 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?+
Gross-load vs chart utilization for a loader (knuckle-boom) crane, with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool. Every extension segment deployed drops capacity another step. 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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