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Want to Know How to Measure Box Size for Your Products?

The Packaging Shelter Guide to getting dimensions right for protection, shipping savings, and customer satisfaction.

Get Expert Help

Hello there! As the packaging experts at Packaging Shelter, we know that getting the dimensions of your shipping and product boxes just right is more than just a measurement—it's the key to protecting your products, minimizing shipping costs, and ensuring customer satisfaction.

A box that's too big means wasted material and higher dimensional weight (DIM weight) charges. A box that's too small? Well, that's just a recipe for a damaged product and an unhappy customer!

The Golden Rule: L x W x D

When you talk to any packaging or shipping carrier, they will always ask for three dimensions, typically in the following order:

Length x Width x Depth (or Height)

Here's how to measure each dimension correctly:

How to Measure Each Dimension

1. Length (L): The Longest Side

How to measure: This is the longest side of the box opening (the largest dimension of the base).

Tip: If you lay the box flat on a table, the Length is the longest side running left to right.

2. Width (W): The Shorter Side

How to measure: This is the shorter side of the box opening (the smaller dimension of the base).

Tip: This dimension is perpendicular to the Length.

3. Depth or Height (D/H): The Vertical Side

How to measure: This is the distance from the top opening to the bottom of the box.

Tip: This is the vertical dimension when the box is standing upright.

Inside vs. Outside: Why It Matters

Inside Dimensions (for Product Fit)

These measurements are critical for determining if your product will fit comfortably inside the box.

  • Always measure your product first
  • Add a small allowance (1/8 to 1/4 inch) for packing materials
  • Makes loading/unloading easy
  • Ensures proper product protection

Outside Dimensions (for Shipping Costs)

These measurements are what carriers use to calculate shipping costs, especially DIM Weight.

  • Used by FedEx, UPS, USPS for pricing
  • Always slightly larger than inside dimensions
  • Includes cardboard wall thickness
  • Critical for accurate shipping quotes

Packaging Shelter Pro-Tip

When you order your custom boxes from us, let us know if you are providing the exact dimensions of your product (inside) or the maximum external size you can ship (outside). We'll handle the necessary wall thickness calculations!

Measuring Odd-Shaped Items

What if your product isn't a simple cube or rectangle?

For Cylinders (like a rolled poster or bottle)

Length (L): Measure the length of the cylinder.

Diameter: The space the cylinder takes up is equal to its diameter. So the box's Width and Depth will need to be slightly greater than the diameter.

Tip: Add at least 1/4 inch to the diameter for proper cushioning.

For Irregular Shapes (like a sculpture)

Place the object against a wall. Take a flat surface (like a ruler or book) and touch it to the opposite side of the object, perpendicular to the wall.

Measure the distance from the wall to the flat surface for Length, Width, and Depth to find the minimum rectangular box needed.

Tip: Always add cushioning space for fragile items.

Ready to Find Your Perfect Box?

Getting the right fit is crucial for protecting your bottom line and your products. At Packaging Shelter, we specialize in crafting custom packaging solutions designed for a perfect fit, every time.

Stop overpaying for shipping and start protecting your products the right way!

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