Tower Crane Selector

Enter your working radius R, under-hook height, and the heaviest pick with its radius. The app builds the load-moment capacity curve C(r), checks capacity, reach, tip and freestanding height for indicative crane classes, and recommends the smallest class that passes every check — with a capacity-vs-radius diagram.

⭐ Free to select · Balance … EP

⚠️ Educational selector — always verify against the manufacturer's actual load chart. The library uses a simplified hyperbolic C(r)=M/r model with indicative crane classes. A real load chart depends on the specific machine, jib configuration, counter-jib ballast and reeving, and is the only valid basis for procurement and erection.

① The lift & the site

Working radius R (m)

Required under-hook height (m)

R = horizontal distance from the crane centre to the farthest pick. Under-hook height ≈ building height + lift clearance + rigging/load height — enter it directly.

② The critical load

Load units

Heaviest load W_max (t)

Radius of that pick r_load (m)

Tip pick at jib end W_tip (t) opt.

Dynamic + safety factor

Required capacity = load × factor. The factor (default 1.25) covers hoisting/dynamic effects and a safety margin on the lifted weight.

③ Crane class (indicative library)

Pick a top-slewing class by max load moment M

Choose Auto to let the app recommend the smallest class that passes every check, or pick one to check it directly. You can override any spec below.

Load moment M (t·m)

Max capacity C_max (t)

Max jib length L_jib (m)

Max freestanding height H_free (m)

Library figures are indicative only — verify every value against the manufacturer's load chart for the chosen machine and jib configuration. r_const = M / C_max is computed automatically.

🏗️ Crane selection

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Load-moment capacity check

Required cap. @ r_load

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Available cap. C(r_load)

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Const-cap radius r_const

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Tip load M / L_jib

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Capacity at radius R

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Load moment M

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Load-moment utilization —

Selection checks

Check	Required	Available	Result