Crane Load Chart and Capacity: Lifting Within the Limits
A crane capacity is not one number, it changes with every degree of boom angle and foot of radius. Reading the load chart correctly is what keeps a lift from becoming a tip-over.
QUICK ANSWER
A crane load chart defines the maximum safe load for every combination of boom length, boom angle, and load radius, along with setup conditions like outrigger extension. Reading it correctly, and understanding that capacity drops sharply as radius increases, is essential to prevent overloading and tip-overs. The rated capacity is never a single figure.
Capacity Changes With Every Lift
The most dangerous crane misconception is a single capacity number. Real capacity depends on boom length, boom angle, and load radius, and it falls sharply as the load moves away from the crane. Reading the chart for the actual configuration is the difference between a safe lift and a tip-over.
Reading the Chart
- Radius and angle: capacity drops as radius increases and angle decreases.
- Setup conditions: outrigger extension and configuration change the ratings.
- Deductions: rigging and attachments reduce net capacity.
A Precision Safety Skill
Load-chart literacy pairs with rigging, signaling, and immersive VR safety training.
WE BUILD THIS IN VR — THE PRIME VR
We build load-chart reading into VR so operators and lift directors practice matching the load to the chart for the actual boom, radius, and setup on realistic lifts. The scenario stages an overload from a misread chart, an expensive lesson made safe.
Book a discovery callFrequently Asked Questions
What is a crane load chart? +
A chart that defines the maximum safe load for every combination of boom length, boom angle, and load radius, plus setup conditions like outrigger extension. Rated capacity is never a single number.
Why does crane capacity change during a lift? +
Capacity drops sharply as the load radius increases and the boom angle decreases. Moving a load away from the crane reduces how much it can safely lift, which is why the chart must be read for the actual configuration.
How does VR help with crane safety? +
VR lets operators and lift directors practice reading the load chart and matching it to the real setup, building the literacy that prevents overloads and tip-overs, without risking a real crane.
Train lifts that stay within the chart
We build load-chart reading into scored VR practice.