How To Measure a Box or Bag: Length, Width & Height

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TLDR: Understanding how to measure a bag or box correctly is essential whether you’re selecting moving boxes for relocation, choosing packaging for shipping, or determining if items with bubble wrap will fit securely. The universal standard for box length width height follows a simple L x W x H format, making it easy to compare dimensions across different boxes and bags. Knowing these measurements helps ensure your items (from delicate products wrapped in bubble wrap to larger goods in moving boxes) fit safely with adequate usable space. This guide breaks down the measurement process into three straightforward steps, eliminating confusion when shopping for boxes and bags of any size.

Looking for the right boxes and bags for your item, struggling to figure out confusing measurements, and then having to package and ship your items – ugh! It can all be overwhelming. Trust us, we know the struggle. With 26,000+ boxes, bags, and other packaging must-haves in our own inventory, we understand that industry terms and dimensions can be confusing.

This is why we’ve simplified the process into an easy-to-remember, universal: Length, Width, and Height. We’ve even made a printable diagram for your own reference!

Let us help demystify measurement confusion and walk you through how to easily read box and bag measurements.

 

L x W x H : Length, Width, Height

Start from the basics when you’re reading dimensions, Length (L), Width (W), and Height (H). Shorthand, it’s written like this: L x W x H . Typically read from left to right. For these examples, we’ll use a simple box.

Length

Length is usually the longest side of your package. When you’re shopping around and reading dimensions for your box or bag, length is usually listed first.

If you have a box in front of you, hold it open (like in the diagram). Take your ruler and measure the longest side, from edge to edge. Record this measurement in inches. This measurement is your length.

 

Width

To make sure your items fit into your box or bag, the width is crucial. When reading measurements, width is typically the second dimension listed.

With your box, measure the distance from the front to the back. This measurement is your width.

 

Height

Height is the measurement from the bottom of your package to the top. Because dimensions listed usually want to quote the amount of space your item is able to comfortably sit in, this measurement will not include the opening of your package. Height is usually the last dimension listed.

Using your box, measure the distance from the bottom of your box to the top. Do not include the opening of your box. This measurement is your height.

Key Takeaways:

• Standard measurement format: All boxes and bags follow the universal Length Width Height (L x W x H) format, with measurements typically read from left to right
• Length is the longest side: Box length width height starts with length, which is usually the longest dimension and listed first when shopping for packaging
• Width measures front to back: The width measurement determines how deep your box or bag is, crucial for ensuring items fit properly
• Height excludes the opening: When measuring height, measure from bottom to top but don’t include the box opening or flaps in your measurement
• Inside dimensions matter most: Listed measurements refer to usable space (inside dimensions), not outside measurements, which is critical when sizing boxes for specific items
• Allow room for protection: When selecting boxes or moving boxes, remember to account for extra space needed for bubble wrap, cushioning materials, or padding to keep items safe during transport
• Universal application: Whether measuring gift bags, shipping boxes, or moving boxes, the same L x W x H measurement system applies across all packaging types

Things To Remember: Inside Dimensions & Usable Space

When you are looking for the right bag or box, remember that the measurements listed are going to be the inside dimensions. This is because the inside dimensions of a box and bag are how you can best determine whether or not your item will fit comfortably (and safely). These dimensions make up the what is called, usable space. Usable space is the actual amount of space available for your item.