Understanding container weight limits is essential. In our operations at Bofeng Logistics, overweight containers are one of the top three reasons for shipment delays at origin ports. A container that exceeds the verified gross mass by even 500 kg can be refused by the carrier.
This guide explains the three weight specifications for shipping containers, provides reference tables for each container type, and covers country-specific regulations.
The Three Weight Specifications
Every shipping container has three standard weight specifications:
| Term | Abbreviation | Definition |
| Tare Weight | TARE | The weight of the empty container itself |
| Maximum Payload | PAYLOAD | The maximum cargo weight the container can carry |
| Maximum Gross Weight | MGW | Tare weight + payload = total allowable weight |
The relationship: MGW = TARE + PAYLOAD
Weight Limits by Container Type
| Container Type | Tare Weight | Max Payload | Max Gross Weight |
| 20GP Dry Van | 2,200 kg | 28,280 kg | 30,480 kg |
| 40GP Dry Van | 3,700 kg | 26,780 kg | 30,480 kg |
| 40HQ Dry Van | 3,900 kg | 26,580 kg | 30,480 kg |
| 20GP Reefer | 2,800 kg | 27,680 kg | 30,480 kg |
| 40GP Reefer | 4,100 kg | 26,380 kg | 30,480 kg |
| 20GP Open Top | 2,400 kg | 28,080 kg | 30,480 kg |
| 40GP Open Top | 4,000 kg | 26,480 kg | 30,480 kg |
Key observation: All container types share the same maximum gross weight of 30,480 kg (67,200 lbs). The difference is in tare weight — heavier containers (reefers, open tops) have lower payload capacity.
Country and Carrier Weight Limits
The 30,480 kg MGW is the container structural limit. However, road and rail weight restrictions in different countries often impose lower effective limits:
| Country/Region | Road Weight Limit | Notes |
| China | 45,000 kg (truck + container) | Axle-dependent; 4-axle combinations have higher limits |
| United States | 36,287 kg (80,000 lbs total) | Federal limit; some states have lower limits |
| Europe | 40,000–44,000 kg (total) | Varies by country; intermodal transport has different rules |
| Australia | 42,500–68,000 kg (depending on configuration) | Road train configurations have higher limits |
| Canada | 39,500–41,000 kg (depending on province) | Axle configuration matters |
Practical implication: A 20GP container loaded to its maximum payload of 28,280 kg may exceed road weight limits in certain countries. Always check the full route — not just the container limit.
How Weight Limits Affect Your Shipment
By container size:
20GP: Weight-limited. You will typically hit the payload limit before you fill the container's cubic capacity (28 CBM). Best for dense, heavy cargo.
40GP: Volume-limited for most cargo. You will fill the container's cubic capacity (67 CBM) before reaching the weight limit — unless shipping particularly dense goods.
40HQ: Same as 40GP — volume-limited. The extra height adds capacity without increasing weight limits.
Axle weight calculation for road transport
Road transport in China is regulated by axle weight limits, not just total container weight. A typical 3-axle tractor + 2-axle trailer combination has these limits:
| Axle Group | China Legal Limit | Typical 20GP Loading | Typical 40GP Loading |
| Steering axle (1 axle) | 7,000 kg | 5,000-6,000 kg | 5,000-6,000 kg |
| Drive axle (1-2 axles) | 11,500 kg (single) / 18,000 kg (tandem) | 10,000-13,000 kg | 10,000-12,000 kg |
| Trailer axle (2-3 axles) | 18,000 kg (tandem) / 24,000 kg (tri-axle) | 16,000-20,000 kg (loaded 20GP) | 14,000-16,000 kg (loaded 40GP) |
| Total vehicle + container | 49,000 kg (China national standard) | ~32,000 kg (20GP loaded to 80%) | ~28,000 kg (40GP loaded to 80%) |
Practical calculation: For a 20GP container loaded to 22,000 kg cargo + 2,200 kg tare = 24,200 kg, the axle distribution when centered on a tri-axle trailer is approximately:
- Steering: 5,500 kg ✅ (under 7,000 kg limit)
- Drive tandem: 17,000 kg ✅ (under 18,000 kg limit)
- Trailer tri-axle: 22,700 kg ✅ (under 24,000 kg limit)
> Tip: Ask your trucking provider for the axle weight distribution before loading. Uneven loading (cargo concentrated at one end of the container) can exceed individual axle limits even when total weight is compliant.
The cost implication:
Shipping a container that is "weight-limited" (full by weight but not by volume) means you pay for the whole container while only using part of its space. This is acceptable for high-value dense cargo but inefficient for low-value heavy goods.
Overweight Container Fees
| Scenario | Typical Fee |
| Container exceeds carrier max (30,480 kg) | Carrier may refuse to load |
| Container exceeds road limit | Fines vary by country: USD 500–5,000 |
| Overweight surcharge at origin port | CNY 500–2,000 |
| Overweight surcharge at destination | Varies by terminal |
Container Weight Verification Methods
The SOLAS VGM (Verified Gross Mass) regulation requires shippers to verify container weight before loading. Two methods are accepted:
| Method | How It Works | Equipment Required | Accuracy |
| Method 1: Weigh entire packed container | Drive the loaded container over a calibrated weighbridge | Port or certified weighbridge | Highest — officially preferred by carriers |
| Method 2: Weigh all cargo + add tare weight | Weigh each item individually, sum all cargo weights, add container tare from door plate | Certified floor scales at loading point | Acceptable — subject to cumulative 2-3% error |
What happens without VGM: The SOLAS amendment makes VGM a mandatory condition for loading. Containers without verified weight are not loaded onto the vessel. The shipper named on the bill of lading is legally responsible for providing the VGM.
Common VGM mistakes:
- Using supplier-provided weight estimates instead of actual weighing
- Forgetting to include pallets, dunnage, and packaging materials in the total
- Relying on container door plate tare weight that may be outdated (door plates can show pre-repair tare values)
Country-Specific Overweight Permit Procedures
For overweight containers (exceeding road limits but within container structural limits), special permits may be available:
| Country | Overweight Permit | Lead Time | Cost |
| China | Overlimit transport permit (超限运输许可证) | 3-5 business days | CNY 500-3,000 |
| United States | State-by-state overweight permit | 1-3 business days | USD 50-300 per state |
| Germany | Schwerverkehrsgenehmigung | 5-10 business days | EUR 200-800 |
| Australia | Class 1 permit (each state) | 5-10 business days | AUD 100-500 per state |
Practical tip: If you regularly ship overweight containers, consider splitting the load into two containers or using a 20ft instead of a 40ft — the cost of permits and delays often exceeds the additional container cost.
Tips for Staying Within Weight Limits
- Weigh before shipping: Ask your supplier to weigh loaded containers before they leave the factory
- Distribute weight evenly: Uneven weight distribution can cause handling issues and safety risks
- Consider container type: If your cargo is heavy, choose a 20GP over a 40GP for higher effective payload
- Check axle limits: For road transport, axle weight limits often matter more than total weight
- Plan for inspection: Customs may weigh containers — discrepancies between declared and actual weight can trigger inspections
FAQ
Q: What happens if my container is overweight?
A: The carrier may refuse to load it, or apply overweight surcharges. Exporters may face fines from customs authorities.
Q: Can I ship an overweight container by sea?
A: Yes — sea carriers can handle containers up to 30,480 kg gross weight. The issue is usually road transport to/from the port.
Q: How is container weight verified?
A: SOLAS regulations require verified gross mass (VGM) certification before a container can be loaded onto a vessel.
Q: What is the SOLAS VGM requirement?
A: Since 2016, the International Maritime Organization requires all loaded containers to have a verified gross mass before vessel loading. The shipper is responsible for providing VGM.
Need help calculating container weights for your shipment? Bofeng Logistics can advise on container loading and weight compliance. Contact us.
Bofeng Logistics
Phone/WhatsApp: 13075678958
Email: info@zhbfwl.com
Contact us for a personalized shipping solution.
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