Orient the plan
Use length for the runway travel direction and width for the bridge span direction.
BUYING & LAYOUT / TOOL 05
Crane Hook Coverage Calculator
Use this to compare the proposed hook working area with a rectangular workshop before finalising workstation positions or requesting a layout drawing.
Before you start: required inputs
- Find the clear workshop length along the runway and width across the bridge on the building plan.
- Obtain the hook-centre approach distances at both runway ends and both sides from the proposed crane general arrangement.
Calculation diagram
A PRACTICAL WALKTHROUGH
How to use this calculator
Set all four hook approaches
Measure each approach from its corresponding workshop boundary to the hook centre at the travel limit.
Compare the useful rectangle
Check covered length, covered width and area. Mark obstructions and the footprint of the actual load separately on your plan.
A 30 m by 12 m workshop
THE INPUTS
Length 30 m; width 12 m; end approaches 1 m and 1.2 m; side approaches 0.8 m and 0.8 m.
THE RESULT
The hook-centre coverage is 27.8 m by 10.4 m, giving 289.12 m², or about 80.3111% of the workshop rectangle.
What does the result mean?
01
Covered runway length shows the usable hook travel along the bay.
02
Covered bridge width shows the usable hook travel across the bay; it is not necessarily the crane’s rail-centre span.
03
Area percentage compares two rectangles. It does not mean every point is accessible with a bulky load or through an obstruction.
Watch for this
Entering the trolley or bridge physical clearance instead of the distance from the workshop boundary to the hook centre at its travel limit.
Formula & model conditions +
Covered length = workshop length − near-end approach − far-end approach
Covered width = workshop width − left approach − right approach
Covered area = covered length × covered width
- Approaches are measured from the corresponding workshop boundaries to the hook centre at its travel limits.
- Coverage is a plan-view rectangle. Columns, obstructions, load dimensions and excluded operating zones are not deducted.
- Approaches must come from a proposed crane layout; zero approach does not establish that a crane can reach a wall.
Common questions
Does the tool subtract columns or machines?
No. It gives the travel-limit rectangle. Mark obstacles, prohibited zones and the load footprint separately.
Can I enter zero for an approach?
Yes if your layout defines zero for that boundary, but the calculator does not establish that a proposed crane can actually reach a wall.