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Dimensions of a Box How to Measure the Exact Size

There's more to choosing the right box than just picking one off the shelf at your local store. You need to take into account the box dimensions of the item you're shipping, as well as the weight and fragility of the contents. In this article, we'll walk you through how to measure the right size box for your needs.

Understanding Box Dimensions


Boxes Dimensions

Understanding how to accurately measure box dimensions is the first step in creating the perfect packaging. While this may appear to be elementary mathematics, measuring your dimensions with care necessitates some thought.

So, What Dimensions are Required?

Boxes are measured along three main dimensions: length, width, and depth. To begin, measure the following dimensions from the box's top opening:

Length: The longest side of the box, when viewed from the top
Width: The shorter side of the box, when viewed from the top
Depth (Height): The perpendicular side to the length and width

The depth of a tall or upward-facing box is the largest dimension, while the length and width are smaller. While square boxes should have equal sides, in theory, this is less likely to be the case in packaging. So, make sure you accurately measure each dimension to ensure your packaging is up to par for your products! The type of box you select will be determined by the shape and size of your product.
However, regardless of the type of box, the measurements required for production will be determined by the length, width, and depth.

Internal, External, and Score-To-Score Dimensions

When it comes to choosing the right size box, there are three main things to consider: internal dimensions, external dimensions, and score-to-score dimensions.

Internal Dimensions

When assembled, the interior dimensions of a box reflect the amount of usable space in it. The interior dimensions are the industry standard measurement used to determine how well a product will fit inside.
When ordering boxes, the default measurements displayed are for the interior dimensions. A 10" x 10" x 6" box, for example, will have 10" of space from wall to wall (length and width) and 6" of space from bottom to top (depth).
Interior dimensions are critical when looking for a lay custom box to fit your product or designing a custom box from the ground up. However, if you're attempting to replicate an existing box, they're not the most precise set of dimensions to communicate to your manufacturer.

External Dimensions

When assembled, the external dimensions of a corrugated box reflect the full size of the box itself. These are useful for shipping and inventory purposes. When expressed in terms of exterior dimensions, our 10" x 10" x 6" box from example above may measure 10 3/8" x 10 3/8" x 6 5/8" fully assembled.
External dimensions only tell us the final size of the box and nothing about the thickness of the material used to make it. As a result, they are not the most precise set of measurements to provide to your packaging partner.

Score-To-Score Dimensions

If you want to replicate your box with your packaging manufacturer, using score-to-score dimensions is the most accurate way to measure it. Score-to-score dimensions are the distance between your box's "scores" (where it folds) and take into account the thickness of the corrugated board, also known as material allowances.
You'll notice that the score-to-score dimensions fall somewhere between your box's interior and exterior dimensions.

How To Measure The Box Size

There are two ways to measure the size of a box. The first is to use a ruler or measuring tape to measure the box's length, width, and height. The second is to use the dimensions of the box itself. To do this, you will need to know the measurements of the box's length, width, and height.
The volume will make it easier to determine your shipping, warehousing, and distribution processes. It will also assist you in determining how well your product will fit into your desired packaging. Your packaging volume is critical in terms of material and cost optimization, as well as structural engineering! Make sure not to skip this step!
Now that you have your basic dimensions and know how to measure a box, you can easily calculate the volume of your box. To calculate the volume, simply multiply the three dimensions.

Volume = Length x Width x Depth

Choosing The Right Size Box For Your Products

boxes dimensions

When it comes to choosing the right size box for your project, there are a few things you need to take into account. Here are a few tips on how to choose the right size box:
1. What are the dimensions of your Product? Make sure to measure your product before you start shopping for boxes so you know exactly what size you need.
2. How many boxes will you need? Once you know the dimensions of your project, you can start estimating how many boxes you'll need. Keep in mind that you may need more or less depending on the type of project you're working on.
3. What is the weight of your product? This is important to consider because some boxes are not meant to hold heavy items. Make sure to check the weight limit of the box before making your purchase.
4. How will you be using the box? Will you be shipping it or storing it? If you're planning on shipping your project, make sure to choose a box that's designed for shipping. And if you're planning on storing your project, make sure to choose a box that's sturdy and won't collapse under the weight of your project.
5. What is your budget? Consideration of budget availability is also an important thing when it comes to choosing a perfect packaging solution for your products. Along with caring for the quality and aesthetics, also care for the affordability. Try to find a packaging supplier with lower prices, but you should not be compromising on the quality and other things.

Common Mistakes People Make When Choosing A Box Size

One of the most common mistakes people make when choosing a box size is not taking into account the dimensions of the items they are packing. Make sure to measure the length, width, and height of your items before selecting a box size. Another mistake is assuming that all boxes are created equal. Be sure to check the weight limit and sturdiness of the box before making your purchase. The last thing you want is for your box to collapse under the weight of your belongings.

custom boxes


In conclusion, the dimensions of a box are an important factor to consider when you are looking for the right size for your needs. If you need help finding the perfect size for your project, please contact us and we will be happy to assist you. Thank you for reading!