How Crane Capacity Charts Work Explained Without the Jargon
Crane capacity charts can look intimidating at first glance. Columns of numbers, varying boom lengths, angles and radii can quickly become overwhelming if you are not used to reading them.
Yet understanding a crane capacity chart is one of the most important steps in selecting the right lifting equipment.
What is a crane capacity chart?
A crane capacity chart shows how much weight a crane can safely lift at specific boom lengths and lift radii. It is not a single maximum number. Instead, it is a guide that changes depending on how the crane is configured and how far the load is positioned from the machine.
The key thing to remember is that lifting capacity decreases as lift radius increases. In simple terms, the further the load is from the centre of the crane, the less it can lift safely.
Why maximum capacity figures can be misleading
When a crane is described as a 20-tonne crane or a 50-tonne crane, that figure usually refers to its maximum lifting capacity at a very short radius. That does not mean it can lift that weight at full reach.
For example, a crane might lift 20 tonnes at a radius of three metres but only lift 5 tonnes at a radius of ten metres. This is completely normal and built into the engineering design of the machine.
That is why reading the full crane load chart is essential before confirming a lift plan. It ensures the crane is operating within safe working limits at the exact radius required for your project.
How JT Cranes helps simplify the process
At JT Cranes, we support clients through our Crane Hire services and Contract Hire solutions, ensuring the correct equipment is selected with safety and compliance in mind. While we no longer sell new cranes, we remain a trusted partner for lifting solutions across a wide range of industries.
We also provide Test Weights Hire to help clients maintain certification and compliance, alongside expert Crane Repairs to keep lifting equipment safe and operational.
If needed, we can review your lift requirements, assess site conditions and confirm safe working loads without unnecessary technical language. Our aim is always to ensure lifts are carried out safely, efficiently and with full compliance.
If you would like help interpreting a crane capacity chart or need advice on the right crane for your lift, visit our Contact page to speak with the team. We are known for our responsive service and straightforward advice, and we are always ready to help you plan with confidence.