How do you choose the right crane size (tonnage)?

You choose crane size by checking the load chart, not the name on the truck: the crane must be rated to lift the total load (the item plus rigging) at the radius, boom length and height your lift needs. A crane's headline tonnage is only available very close to the crane, so capacity drops quickly as reach grows. Send the weight, the reach and the height, and the operator sizes the crane.

Casper Crane Connect is an independent referral service, not a crane company. We pass your request to local operators, who quote and perform the work themselves.

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The three numbers that size a crane

Total load weight: the heaviest item plus everything hanging from the hook (slings, shackles, spreader bars, and the hook block itself on many charts). Use the manufacturer's spec sheet, shipping paperwork or a supplier's weight. Federal crane rules require the operator to verify load weight before lifting (29 CFR 1926.1417(o)), so a source for the weight is useful.
Radius: the horizontal distance from the crane's center of rotation to where the load is picked and where it lands. The longest radius in the lift usually controls the crane size.
Height: how high the load has to go, plus room for rigging and clearance over walls, parapets or equipment.

Why tonnage alone is misleading

A crane advertised by its maximum tonnage reaches that rating only at a short radius with the outriggers fully extended and the specified counterweight installed. At the reach a real job needs, the same crane may lift only a fraction of that. That is why a load that seems light compared with the crane's rating can still need a larger crane, and why the operator checks the specific load chart for your setup.

Setup space and ground conditions

Outrigger footprint: the crane needs room to extend its outriggers or stabilizers, sometimes fully, to reach its charted capacity.
Ground support: soft soil, fresh backfill, septic systems or buried utilities can require mats or cribbing, or a different setup spot.
Obstructions: buildings, trees and power lines can force a longer radius, which can push you into a bigger crane.

Rough sizing by job type

As a general pattern only: trusses, roofing materials and light HVAC units are often handled by a boom truck or small truck crane; rooftop units, steel, tanks and precast often need a mid-size mobile or rough terrain crane; very heavy or long projects may call for a large all-terrain or crawler crane. The load chart decides.

Ready to price your lift? Request a free crane quote and a local operator will follow up directly.

Common questions

What does a 30-ton or 50-ton crane rating mean?

It is the maximum rated capacity under ideal conditions, at a very short radius with the specified setup. Capacity at the radius your job needs is lower, and the load chart for that crane and configuration gives the actual number.

Do I need to know the exact weight?

A good estimate is enough to request a quote, but before the lift the weight must be confirmed from a reliable source, such as the manufacturer, or checked with the crane's load-weighing or capacity system.

Who decides the final crane size?

The crane operator or provider, based on the load chart, your weights and dimensions, and the site setup. That is why accurate details in your request matter.

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