OOG Overhang Calculator
Plan over-dimensional cargo shipments with confidence
20GP
General
Ext: 6.1×2.4×2.6m
40GP
General
Ext: 12.2×2.4×2.6m
40HC
High
Ext: 12.2×2.4×2.9m
20OT
OOGOpen
Ext: 6.1×2.4×2.6m
40OT
OOGOpen
Ext: 12.2×2.4×2.6m
20FR
OOGFlat
Ext: 6.1×2.4×2.6m
40FR
OOGFlat
Ext: 12.2×2.4×2.4m
20PL
OOGPlatform
Ext: 6.1×2.4×0.4m
40PL
OOGPlatform
Ext: 12.2×2.4×0.6m
Container External
6.06 × 2.44 × 2.59 m
Cargo Size
5.50 × 2.80 × 3.00 m
Max Payload
22.1 t
On Deck
Stowed above deck level
• Suitable for OOG cargo
• Weather exposure
• Lower stowage priority
Below Deck
Stowed in cargo hold
• Weather protected
• Limited height clearance
• Not suitable for height OOG
Include Lashing Requirements
Calculate lashing equipment and costs
Platform containers with no side walls or roof, ideal for heavy machinery, vehicles, and oversized cargo that cannot be loaded through standard container doors.
Best for: Heavy machinery, vehicles, steel structures
Overhang capacity: Up to 0.76m width, 3m+ height
Max payload: Up to 39,400 kg (40' FR)
Standard containers with removable top (tarpaulin cover), suitable for cargo that exceeds standard height or requires top-loading with cranes.
Best for: Tall cargo, top-loading goods, glass panels
Overhang capacity: Up to 0.5m width, unlimited height
Max payload: Up to 26,140 kg (40' OT)
Flat bed containers without end walls, designed for extremely heavy and oversized project cargo requiring maximum flexibility in loading and securing.
Best for: Project cargo, heavy equipment, transformers
Overhang capacity: Up to 1m width, 4m+ height
Max payload: Up to 40,000 kg (40' PL)
Out of Gauge (OOG) cargo refers to freight that exceeds the standard external dimensions of a shipping container. This cargo cannot be loaded into a standard dry container due to its size.
OOG cargo requires special equipment such as flat racks, open-top containers, or platform containers. It also incurs additional charges from carriers due to the extra handling requirements and lost slot capacity.
Standard Container Dimensions:
- • 20' GP: 6.058 × 2.438 × 2.591 m (exterior)
- • 40' GP: 12.192 × 2.438 × 2.591 m (exterior)
- • 40' HC: 12.192 × 2.438 × 2.896 m (exterior)
Use Flat Rack When:
- • Cargo exceeds width limits significantly
- • Heavy machinery needs side-loading
- • Cargo weight exceeds 28,000 kg
- • Multiple overhang dimensions apply
Use Open Top When:
- • Only height exceeds container limits
- • Top-loading is required
- • Cargo is within standard width
- • Weather protection is needed
Use Platform When:
- • Maximum overhang flexibility needed
- • Extremely heavy project cargo
- • Complex lashing requirements
- Stowage Plan: Detailed cargo placement diagram
- Lashing Certificate: From certified marine surveyor
- Cargo Manifest: With exact OOG dimensions
- Booking Confirmation: With OOG acceptance
- Insurance Endorsement: For OOG cargo coverage
- •Standard marine insurance may not cover OOG cargo without endorsement
- •OOG cargo typically has higher risk premiums (10-30% more)
- •Weather damage is more likely for on-deck stowage
- •Verify lashing warranty coverage from surveyor
- •Consider Institute Cargo Clauses (A) for maximum protection
- ✗Underestimating overhang dimensions - always include securing points
- ✗Not booking adjacent slots for width overhang cargo
- ✗Assuming standard rates apply - OOG charges can double costs
- ✗Forgetting port limitations - some terminals can't handle large OOG
- ✗Ignoring weight distribution - critical for flat rack cargo
- 1.Always provide cargo drawings with center of gravity marked
- 2.Book OOG cargo at least 3-4 weeks in advance
- 3.Request specific vessel stowage position (on deck preferred)
- 4.Include lifting points/lugs in cargo design
- 5.Get lashing plan approved by carrier before shipment
- 6.Consider breakbulk as alternative for extreme OOG
- 7.Document cargo condition with photos before loading
- 8.Verify discharge port has equipment for OOG handling