How Many CBM Fits in a 20ft and 40ft Container? Packing Guide
A container looks simple from the outside. It is a steel box with doors at one end, and it seems as if you only need to fill it up. In practice, packing a container well takes planning. Cartons come in different sizes, pallets take up floor space, machinery has an awkward shape, and fragile goods need protection. The question most importers ask first is a simple one: how many CBM fits in a 20ft and a 40ft container? CBM means cubic metre, and it is the standard way to describe the volume of cargo. If you know the CBM of your cargo and the approximate CBM of the container, you can plan whether your goods will fit, whether you need a larger container, and how to load the container so that the space is used well and the goods arrive safely.
This guide answers that question in practical, step-by-step terms. It explains what CBM means, the widely standard approximate internal volumes of a 20ft container, a 40ft container, and a 40ft high cube container, how to measure your cargo, how to work out how much of a container your cargo needs, and how to pack cartons, pallets, and machinery so that the space is used well. It also covers the documents and checks before loading, and the common packing mistakes that waste space or cause damage. No fixed prices, rates, or fees are given here. A rate or fee is confirmed only after checking the actual shipment and its documents.
Total Import Solution, since 2016, supports importers in Bangladesh with shipment planning, container loading advice, documentation, customs clearance support, and delivery coordination. The aim of this guide is to help you plan a container load properly, so that the volume is measured correctly, the packing is sound, the papers match the cargo, and there are no surprises at the port.
1. What CBM Means and Why It Matters for Container Packing
CBM stands for cubic metre. One CBM is the volume of a cube that measures one metre on each side. For cargo, the CBM of a carton or a piece of machinery is worked out from its length, width, and height in metres, multiplied together. A carton that measures one metre long, one metre wide, and one metre high has a volume of one CBM. A carton that measures half a metre on each side has a volume of one eighth of a CBM. Adding up the CBM of every carton, pallet, and piece gives the total volume of the shipment.
| Term | What it means | Why it matters for packing |
|---|---|---|
| CBM | Cubic metre, the volume of cargo | Shows how much space the cargo takes |
| Total CBM | CBM of all cartons and pieces added together | Decides which container size to plan for |
| Carton CBM | Length times width times height of one carton, in metres | Helps plan how cartons fit together |
| Pallet CBM | Volume of a loaded pallet, including the pallet itself | Pallets take floor space and height |
| Usable volume | Space that can actually be filled, after gaps and shape | Real loads rarely fill every corner |
2. Standard Container Sizes in General Terms
The two container sizes used most often by importers in Bangladesh are the 20ft container and the 40ft container. A 20ft container is about six metres long inside, and a 40ft container is about twelve metres long inside. Both are about two and a half metres wide inside, and a standard container is about two and a half metres high inside. A 40ft high cube container is the same length and width as a standard 40ft container, but it is taller inside, so it holds more volume. These are widely standard approximate sizes, and the exact internal measurements can differ a little from one container to another. Always check the actual container before loading, because the door size, the floor condition, and the internal height all affect what can be loaded.
| Container type | Approximate internal length | Approximate internal volume | Planning note |
|---|---|---|---|
| 20ft container | About six metres | About 33 CBM | Suits a moderate load of cartons or pallets |
| 40ft container | About twelve metres | About 67 CBM | Suits a large load, about twice a 20ft load |
| 40ft high cube container | About twelve metres, taller inside | About 76 CBM | Suits light, bulky cargo that needs height |
| 20ft container, usable volume | Depends on cargo shape | Often less than the internal volume | Gaps, pallets, and shape reduce the usable space |
3. How Many CBM Fits in a 20ft Container
A 20ft container has an approximate internal volume of about 33 CBM. That is the widely standard approximate figure used for planning, and it describes the empty internal space of the container. In practice, the volume that can actually be used depends on the cargo. Cartons of one regular size can be stacked neatly and can use more of the space. Cartons of many different sizes leave gaps. Pallets take up floor space and leave space above them that may not be usable. Machinery with an irregular shape leaves space around it that cannot be filled. Fragile goods need padding and space between pieces. For these reasons, an importer should plan as if the usable volume of a 20ft container is lower than about 33 CBM, and should keep a margin for safe packing.
| 20ft container point | What to know | Planning action |
|---|---|---|
| Approximate internal volume | About 33 CBM | Use this figure for planning only |
| Usable volume | Lower than the internal volume, depends on cargo shape | Keep a margin, do not plan to the last CBM |
| Best suited cargo | Regular cartons, moderate pallet loads, heavy compact goods | Measure and add up the total CBM first |
| When it may not fit | Mixed carton sizes, pallets, irregular machinery | Check the packing plan with your agent |
| Check before loading | Door size, floor condition, internal height | Check the actual container, not only the plan |
4. How Many CBM Fits in a 40ft Container
A 40ft container has an approximate internal volume of about 67 CBM. That is the widely standard approximate figure used for planning, and it is about twice the volume of a 20ft container. The 40ft container is about twelve metres long inside, so it suits a large shipment of cartons, a large palletised load, or a shipment with many different items. As with a 20ft container, the usable volume is lower than the internal volume. The shape of the cargo, the size of the pallets, the need for padding around fragile goods, and the need for access during unloading all reduce the space that can actually be filled. An importer should therefore plan with a margin, and should not assume that a cargo of about 67 CBM will fit neatly into a 40ft container.
| 40ft container point | What to know | Planning action |
|---|---|---|
| Approximate internal volume | About 67 CBM | Use this figure for planning only |
| Usable volume | Lower than the internal volume, depends on cargo shape | Keep a margin, do not plan to the last CBM |
| Best suited cargo | Large carton loads, large pallet loads, bulky goods | Measure and add up the total CBM first |
| Loading care | Spread weight evenly, brace the load | Heavy below, light above, no loose gaps |
| Check before loading | Door size, floor condition, internal height | Check the actual container, not only the plan |
5. How Many CBM Fits in a 40ft High Cube Container
A 40ft high cube container has an approximate internal volume of about 76 CBM. It is the same length and width as a standard 40ft container, but it is taller inside, so it holds more volume. The extra height is useful for light, bulky cargo that can be stacked higher, such as furniture, soft goods, packaged goods in tall cartons, and goods that are packed in large, light boxes. The extra height is less useful for heavy cargo, because heavy cargo reaches the weight limit before the extra space is used, and for cargo that cannot be stacked high without damage. As with other containers, the usable volume is lower than the internal volume, and it depends on the shape of the cargo and the packing plan.
| High cube container point | What to know | Planning action |
|---|---|---|
| Approximate internal volume | About 76 CBM | Use this figure for planning only |
| Extra space | Taller inside than a standard 40ft container | Suits light, bulky cargo that stacks well |
| When it helps less | Heavy cargo, cargo that cannot be stacked high | Check weight and stacking before deciding |
| Stacking care | Heavy below, light above, stable top layer | Brace the load so it does not lean or shift |
| Check before loading | Door height, warehouse height, internal height | Check the actual container and the loading point |
6. How to Measure Your Cargo in CBM
Measuring cargo in CBM starts with the supplier. Ask the supplier for the length, width, and height of each carton, and the number of cartons of each size. The measurements should be in centimetres or metres, and they should be the outside measurements of the packed carton, not the size of the goods inside. A carton that is wrapped in extra padding is larger than the goods inside it, and the packed size is what takes up space in the container. If the supplier gives the measurements in centimetres, divide each measurement by one hundred to get metres, then multiply length by width by height to get the CBM of one carton. Multiply that figure by the number of cartons of that size, and repeat the step for each carton size. Add the results together to get the total CBM of the shipment.
| Measuring step | What to do | Why it matters |
|---|---|---|
| Ask the supplier | Get length, width, and height of each carton size | Packed size decides the space needed |
| Use metres | Convert centimetres to metres before multiplying | CBM is worked out in metres |
| One carton CBM | Length times width times height, in metres | Shows the volume of a single carton |
| Total CBM | One carton CBM times the number of cartons, added for each size | Shows the total volume of the shipment |
| Pallets and machinery | Measure the loaded pallet or the packed machine | Pallets and crates add volume |
| Written record | Keep carton number, size, and CBM in writing | Basis for the packing plan and checking |
7. How to Calculate How Much of a Container Your Cargo Needs
Once you have the total CBM of your cargo, you can work out how much of a container it needs. Compare the total CBM with the approximate internal volumes in this guide: about 33 CBM for a 20ft container, about 67 CBM for a 40ft container, and about 76 CBM for a 40ft high cube container. If the total CBM is well below about 33 CBM, a 20ft container may be enough, provided the weight and the shape allow it. If the total is between about 33 CBM and about 67 CBM, a 40ft container may be the right choice. If the total is above about 67 CBM but the cargo is light and bulky, a high cube container may be worth checking. These comparisons are a starting point only. The shape of the cargo, the size of the pallets, and the need for padding all affect whether the cargo will fit.
For example, one hundred cartons at one quarter of a CBM each total twenty five CBM, which may fit a 20ft container, while two hundred such cartons total fifty CBM, which may need a 40ft container.
| Calculation step | What to do | Example |
|---|---|---|
| Total CBM | Add up the CBM of all cartons and pieces | One hundred cartons at one quarter CBM each, total twenty five CBM |
| Compare with 20ft | Compare the total with about 33 CBM | Twenty five CBM may fit a 20ft container |
| Compare with 40ft | Compare the total with about 67 CBM | Fifty CBM may need a 40ft container |
| Compare with high cube | Compare the total with about 76 CBM | Light, bulky cargo near sixty seven CBM may suit a high cube |
| Allow a margin | Plan with space to spare, not to the last CBM | Mixed sizes and pallets reduce the usable space |
8. Packing Principles That Help You Use More of the Space
Good packing uses the space well and keeps the goods safe. The first principle is to use cartons of regular sizes where possible. Cartons of one size stack neatly, fill the floor evenly, and leave few gaps. Cartons of many different sizes leave gaps that cannot be filled, and they make the load unstable. The second principle is to load heavy cartons at the bottom and light cartons on top. Heavy cartons at the top can crush the cartons below them, and a top-heavy load can shift. The third principle is to pack tightly, with no empty gaps. Gaps let cartons move during the journey, and moving cartons can fall, crush each other, or damage the container doors. Use dunnage, which is packing material placed in gaps, to fill small spaces and to brace the load.
| Packing principle | Good practice | Problem it prevents |
|---|---|---|
| Regular carton sizes | Use one or two carton sizes where possible | Gaps and unstable stacking |
| Heavy below, light above | Heavy cartons at the bottom, light cartons on top | Crushed cartons and a top-heavy load |
| Tight packing | No empty gaps, brace the load with dunnage | Cartons shifting and falling |
| Same marks together | Keep cartons with the same marks in one place | Slow checking and wrong unloading |
| Fragile protection | Padding and clear fragile marks | Broken goods during handling |
9. Packing Different Cargo Types: Cartons, Pallets, Machinery, Odd Shapes
Different cargo types need different packing. Cartons are the simplest cargo to pack, because they are rectangular and they stack well. Cartons of regular size should be stacked in straight layers, with each layer covering the floor evenly. The layers should be stable, and the top layer should not overhang. Pallets are harder to pack, because a pallet takes up floor space and the cartons on it cannot be rearranged. A palletised load uses more space than a loose carton load, because the pallet itself takes height and the cartons on the pallet may not fill the space above them. Pallets should be loaded with the forks facing the doors where possible, so that they can be unloaded easily, and they should be strapped so that they do not move.
| Cargo type | Packing care | Loading note |
|---|---|---|
| Cartons | Stack in straight layers, regular sizes | Fill the floor evenly, no overhang |
| Pallets | Strap the load, forks facing the doors | Pallets take floor space and height |
| Machinery | Crate or frame, padding, fix to the floor | Brace so the machine does not move |
| Long items | Lay flat, bundle together, pad between pieces | Keep bundles straight and supported |
| Odd shapes | Measure largest points, pad corners and edges | Load last where possible, for easy access |
10. Step-by-Step Packing Guide from Measuring to Loading
Step 1: Get the measurements. Ask the supplier for the length, width, and height of each carton, pallet, and piece, and the number of each size. Record the figures in writing.
Step 2: Work out the total CBM. Multiply length by width by height for one carton of each size, multiply by the number of cartons, and add the results together. Do the same for pallets and machinery.
Step 3: Choose the container size to plan for. Compare the total CBM with about 33 CBM for a 20ft container, about 67 CBM for a 40ft container, and about 76 CBM for a high cube container. Allow a margin for shape and packing.
Step 4: Make a loading plan. Decide the loading order: heavy cartons at the bottom, light cartons on top, same marks together, fragile goods protected and marked.
Step 5: Check the container. Before loading, check that the container is clean, dry, and free of damage, with doors that close properly and a floor that is sound. Check the internal height and the door size against the largest piece.
Step 6: Load in order. Load the first cartons at the far end and work towards the doors. Pack tightly, fill gaps with dunnage, and brace the load as you go. Take photos of the loading.
Step 7: Check the load. Before the doors are closed, check the load against the packing list. Count the cartons, check the marks, and make sure nothing is left outside the container.
Step 8: Close and seal the container. Close the doors without forcing them, fit the seal, and record the seal number and the container number on the documents. Keep a copy of the photos and the packing list.
Step 9: Confirm the documents. Check that the invoice, packing list, and bill of lading match each other and match the load.
Step 10: Track and prepare for arrival. Follow the shipment, prepare the customs papers, and arrange transport from the port, so that the goods can be cleared and delivered without delay on arrival.
11. Documents and Checks Before Loading
Documents are the backbone of a container shipment. The most important documents are the commercial invoice, the packing list, and the bill of lading. The invoice shows the supplier, the buyer, the goods description, the quantity, and the value. The packing list shows what is in each carton, including the item name, the quantity, the size, and the weight, and it shows the total number of cartons and the total CBM. The bill of lading shows the port of loading, the port of arrival, the container number, the seal number, and the consignee. These documents must match each other and must match the cargo. A packing list that says one hundred cartons when the container holds ninety cartons will cause a problem at the port.
| Document or check | What it shows | Who checks it |
|---|---|---|
| Commercial invoice | Supplier, buyer, goods, quantity, value | Buyer and agent |
| Packing list | Carton contents, size, weight, total CBM | Supplier, buyer, and agent |
| Bill of lading | Ports, container number, seal number, consignee | Carrier and agent |
| Container condition | Clean, dry, no damage, doors close properly | Loading team and agent |
| Seal number | Seal fitted after loading, number recorded | Loading team and agent |
12. Common Packing Mistakes and How to Avoid Them
The most common packing mistake is measuring the goods instead of the packed cartons. A buyer who works out the CBM from the size of the goods inside the carton will understate the volume, because the carton, the padding, and the wrapping add size. The fix is simple: always measure the packed carton. The second common mistake is planning to the last CBM, with no margin for gaps, shape, and padding. A load that is planned to fill every corner of the container will not fit in practice. The fix is to keep a margin and to check the packing plan with your agent. The third common mistake is mixing many carton sizes in one load without a plan. Mixed sizes leave gaps and make the load unstable. The fix is to use regular carton sizes where possible, and to plan the layers in advance.
| Common mistake | What to avoid | How to avoid it |
|---|---|---|
| Measuring goods, not packed cartons | Volume is understated, load does not fit | Measure the packed carton, with padding |
| Planning to the last CBM | No margin for gaps and shape | Keep a margin, check the plan with your agent |
| Mixed carton sizes, no plan | Gaps, unstable load | Use regular sizes, plan layers in advance |
| Heavy cartons on top | Light cartons crushed, top-heavy load | Heavy below, light above |
| Gaps left in the load | Cartons shift and fall | Pack tightly, fill gaps with dunnage |
| Damp or damaged container | Cartons stained, goods damaged | Check the container before loading |
| Documents do not match cargo | Problem at the port, delay in clearance | Check invoice, packing list, and bill of lading |
13. Working with Your Agent, Planning the Load, and How Total Import Solution Helps
Working well with your agent starts with sharing full information: the measurements of every carton, the number of cartons of each size, the weight, the type of goods, and the date you need the goods. Share the supplier's packing list as soon as it is ready, so that the agent can work out the total CBM, choose the container size to plan for, and make a loading plan. Share the order and the invoice as well, so that the agent can check that the documents match each other and match the cargo. The earlier the agent has the information, the better the plan, and the fewer the surprises at the loading point or at the port.
The mistakes to avoid are the ones in the previous section: measuring the goods instead of the packed cartons, planning to the last CBM, mixing carton sizes without a plan, loading heavy cartons on top, leaving gaps, loading a damp container, and sending documents that do not match the cargo. A good agent checks the measurements and the container, supervises the loading where asked, takes photos, and keeps the buyer informed. Total Import Solution helps importers in Bangladesh at each stage of a container shipment. Since 2016, the company has supported buyers with shipment planning, CBM calculation, container loading advice, document checking, customs clearance support, and delivery coordination. The team checks the invoice and packing list against the order, follows the shipment, files the customs papers, and keeps the buyer informed until delivery.
Frequently Asked Questions
1. What is CBM?
CBM stands for cubic metre. It is the volume of cargo, worked out from length, width, and height in metres, multiplied together. One CBM is the volume of a cube that measures one metre on each side.
2. How many CBM fits in a 20ft container?
A 20ft container has an approximate internal volume of about 33 CBM. The usable volume is lower, because it depends on the cargo shape and packing, so check the actual container and keep a margin.
3. How many CBM fits in a 40ft container?
A 40ft container has an approximate internal volume of about 67 CBM. The usable volume is lower, because it depends on the cargo shape and packing, so check the actual container and keep a margin.
4. How many CBM fits in a 40ft high cube container?
A 40ft high cube container has an approximate internal volume of about 76 CBM. It is taller inside than a standard 40ft container, so it suits light, bulky cargo that can be stacked safely.
5. Why is the usable volume lower than the internal volume?
Cartons do not fill every corner, pallets leave gaps, irregular shapes leave space around them, and fragile goods need padding and space. The actual usable volume depends on the cargo shape and packing.
6. How do I work out the CBM of one carton?
Measure the packed carton in metres, then multiply length by width by height. A carton that measures one metre by half a metre by half a metre has a volume of one quarter of a CBM.
7. How do I work out the total CBM of a shipment?
Work out the CBM of one carton of each size, multiply by the number of cartons of that size, and add the results together for every size, pallet, and piece in the shipment.
8. Should I measure the goods or the packed carton?
Measure the packed carton, with its padding and wrapping, because the packed size is what takes up space in the container. Measuring only the goods inside will understate the volume.
9. What if my cargo is close to the container volume?
If the total CBM is close to about 33 CBM for a 20ft container or about 67 CBM for a 40ft container, ask your agent to check the packing plan and the shape of the cargo before you decide, because a small change in carton size can decide whether the load fits.
10. Do pallets use more space than loose cartons?
Yes, in most cases. A pallet takes floor space and height, and the cartons on a pallet may not fill the space above them, so a palletised load often uses more of the container volume than the same cartons loaded loose.
11. How should heavy and light cartons be loaded?
Heavy cartons should go at the bottom and light cartons on top. Heavy cartons on top can crush the cartons below them and make the load top-heavy.
12. What should I check before loading a container?
Check that the container is clean, dry, and free of damage, with doors that close properly and a sound floor. Check the container number against the booking, and check the internal height and door size against the largest piece.
13. What documents do I need for a container shipment?
The commercial invoice, the packing list, and the bill of lading. The packing list should show the carton contents, size, weight, and total CBM, and all three documents should match each other and the cargo.
14. Why should I take photos of the loading?
Photos of the empty container, the loading, and the sealed container give the buyer a record of what was loaded and how it was packed, which helps if a question arises later about the load.
15. What is the most common packing mistake?
Planning to the last CBM with no margin, and measuring the goods instead of the packed cartons. Both mistakes make the load look right on paper and wrong in practice.
16. How can Total Import Solution help with my container packing?
Total Import Solution supports importers with shipment planning, CBM calculation, container loading advice, document checking, customs clearance support, and delivery coordination in Bangladesh.
Contact Total Import Solution
- WhatsApp: +8801977954302
- Email: info@totalimportsolution.com
- Website: totalimportsolution.com
- Service: How Many CBM Fits in a 20ft and 40ft Container? Packing Guide
- Company: Total Import Solution, serving importers in Bangladesh since 2016.
