How to Measure Carton Box Dimensions

Carton box dimensions expressed in inches
Carton box dimensions expressed in inches

Carton box dimensions help you to understand whether the carton will be able to hold the product that is to be shipped or packaged. This article is meant to guide you on the proper way to determine carton dimensions for your product or products, whether in the manufacturing industry or retail sector.

Carton Box Dimensions

What is “carton dimensions” and how do you determine them? Whether looking to package or ship a product, the carton box measurements are always needed. Carton dimensions refer to its internal measurements, although outer measurements are occasionally required as well.

That said, there are two main ways to measure the dimensions of a carton: inside and outside dimensions. You may also use a ruler or tape measure.

Interior Carton Box Dimensions

Interior carton size dimensions are the most important, and manufacturers will usually list these first. These are what matter most when trying to figure out if a product will fit snugly inside the box. Also, when communicating the specifications of a custom box to your manufacturer.

To get the interior dimensions of a carton, measure the width, length, and height (or depth) of the carton from the inside top corners. Be sure not to include any flaps or other possible protrusions in these measurements.

Outside Carton Box Dimensions

Exterior carton dimensions are not as important to focus on as the interior dimensions. However, they are also needed when trying to figure out how much space a carton will take up.

These dimensions are also useful when determining if a carton will fit into a specific shipping container or other space such as pallet. To get the outside dimensions of a carton box, measure the width, length, and height of the carton from the outside top corners.

Standard Carton Box Dimensions

Although there are no standard carton dimensions, manufacturers will usually have, in stock, ready boxes in a variety of sizes. The most common carton box is the cube. Popular dimensions for ready boxes include those listed below:

  • Length: 3”, 4”, 5” 10”, 12”, 16”, 24”
  • Width: 3”, 4”, 5”, 10”, 12”, 16”, 24”
  • Height/depth: 10”, 12”, 16”, 24”

The above carton box dimensions are in inches. Measuring carton dimensions in cm is also common, so the following are the rough equivalents:

  • Length: 8 cm, 10 cm, 12 cm, 25 cm, 30 cm, 41 cm, 61 cm
  • Width: 8 cm, 10 cm, 12 cm, 25 cm, 30 cm, 41 cm, 61 cm
  • Height/depth: 25 cm, 30 cm, 41 cm, 61 cm

Custom Carton Box Dimensions

For products that don’t fit into any of the above normal carton dimensions, custom cartons will have to be made. Custom cartons can be manufactured to any specifications and dimensions of your choice.

To get started on custom cartons, first, determine how big you want the container or box to be. The carton size will depend on the dimensions or shape of the product.

Consider, also, the amount and type of padding or packaging material that will be going inside of the box.

It is important to get the dimensions right so your product does not have a lot of extra space as that could cause damage to your product during shipping.

Once the carton box measurements are known, the next step is finding a manufacturer that can produce them to those specific dimensions.

Carton box manufacturers will usually provide the option for custom cartons. They may even provide an online

Custom carton box manufacturers will also usually provide useful advice to help you create the best carton for your packaging or shipping needs, so be sure to choose the right company.

How to measure carton box dimensions
How to measure carton box dimensions

How to Measure a Carton Box Dimensions for Shipping

Carton boxes are commonly used for shipping products, whether through the mail or a delivery service. Knowing how to size a carton box for shipping ensures that your product will fit snugly inside and will not be damaged during transit.

As discussed earlier, there are two main types of carton dimensions—interior and exterior. When measuring a shipping carton dimensions, you will need to take both types of measurements into account.

Use these tips to ensure correct shipping box dimensions and box size.

  • Make sure to use a quality measuring tape or ruler when taking any carton box dimensions or measurements.
  • If you’re measuring a folding carton dimensions, do not include the flaps in your internal measurements.
  • Make sure that all of the carton box measurements are in inches or centimeters. This is so that the shipping company can properly calculate the shipping costs.
  • Be as accurate as possible. Do not round up or down too much as this can lead to errors and packaging or shipping problems later on.
  • If at all possible, try to get the exact dimensions of the product that will be going into the carton box. This way, you can be 100% sure that it will fit without any issues.
  • Make sure that the shipping carton dimensions are labeled correctly. This will help the shipping company know how to handle the box and so that your product arrives safely.
  • To label the carton box measurements, start by writing down the length of the box. Then, write down the width of the box. Finally, write down the height/depth of the box.

Remember that it is always better to err on the side of too large rather than too small when it comes to carton dimensions. This is because it is much easier to fill empty space with packing material than it is to try and force a product into a box that is too small.

Carton Box Volume

Carton box volume is a measure of how much space a carton box takes up. When looking for a shipping or product packaging box, it’s important to know the volume so that you can properly determine how much space the box will take up.

The volume of a carton box is calculated by multiplying the length times the width times the height/depth of the box. The resulting number will be in cubic inches or cubic centimeters.

Once you have the volume of your carton box, you can proceed to fill it with your product or products. Remember to pack the box snugly so that your product does not have a lot of extra space as that can cause damage to your product during shipping.


Carton boxes are a common type of packaging and shipping box. They come in many different sizes and can be custom made to specific dimensions. When measuring a carton box dimensions, it’s important to determine its interior and exterior measurements as well as volume. That way, you can be sure that your product will fit inside the box. Use the tips provided to properly measure a carton box dimensions for shipping and other needs such as retail packaging and display.


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