How to Measure the Dimensions of a Box

Key Takeaways:

• Businesses need to accurately measure the boxes they use to prevent damaged goods and ensure efficient use of space in warehouses.
• Getting accurate measurements also ensures you comply with carrier regulations and avoid costly shipping errors.

Whether you're an e-commerce retailer or a small local business owner, this guide can help you get accurate measurements of your custom box.

How to Measure a Box

Measuring the outer dimensions is important not just for the efficient use of warehouse space, but also for shipping, as couriers need this information from you.

To measure the outer dimensions, you will need a tape measure, a ruler, a pencil, and paper to write down the measurements. Make sure you follow this industry-standard order:

Length, Width, and Height (L x W x H)

1. Start by measuring the length, which is the longest side of the box (the side with a flap)
2. Next, turn the box 90 degrees to get the width. This side also has a flap, but it's shorter than the long side.
3. Close the box and secure its flap to measure its height (from top to bottom).

Getting the interior dimensions of a box is also crucial because custom packaging providers need this information to ensure your product fits snugly and there's enough space for packaging fillers, such as custom inserts, tissue paper, packing peanuts, kraft paper, or shredded cardboard.

Use the same step-by-step guide mentioned above to get a box's interior measurements.

How to Calculate Dimensional Weight of a Box

Many carriers, including big companies such as FedEx, USPS, and UPS, use a box's dimensional weight, also known as volumetric or DIM weight, to determine shipping costs. In simpler terms, they compare the size of a box to its weight to calculate the shipping fee.

Here's how DIM weight is calculated:

1. Measure the length, width, and height of the box.
2. Multiply them (L × W × H) to get the volume.
3. Divide the volume by the carrier's DM Factor. Carriers use different DIM Factors that they often update every couple of years. For example, USPS uses 166, so the formula looks like this:

L x W x H/166

The cost to ship your box is based on whichever is greater between the DIM weight and the actual weight. For instance, a box with an actual weight of 6 lbs. but a DIM weight of 8 lbs. would still ship as an 8 lbs. parcel.

Carriers will always base the shipping cost using the higher number to ensure that both the weight of a package and the space it occupies in a vehicle and warehouse are accounted for.

Using the DIM weight pricing model is particularly important for bulky, lightweight items that could otherwise lead to losing money on freight space. A great example is a large box containing a pre-assembled light titanium bike frame.

Common Measuring Mistakes to Avoid

Avoid these common mistakes to promote efficient use of warehouse space, save on costs, and ensure compliance with carrier requirements.

Measuring on an uneven surface. Uneven surfaces can lead to inaccurate measurements. To avoid distortions, measure the box on a flat, stable surface.

Measuring the smallest points. For uneven or unconventionally shaped shipping containers, always measure from the widest and tallest points.

Not following the industry-standard format. For the sake of consistency and accuracy, always follow the L x W x H format when measuring a box.

Not measuring the interior dimensions of a box. You need this information to ensure your product fits snugly and there is adequate space for cushioning and padding materials.

Mixing units (inches vs. centimeters). Stick to one unit of measurement for consistency.

Frequently Asked Questions

How do I measure irregular boxes?

To measure irregular boxes, get the longest point to find the length, the widest point for the width, and the tallest point for the height. Treat them as if they were a rectangular box, although the main difference is that you measure the extreme points rather than the narrowest or smallest points.

Do all carriers use DIM weight pricing?

No, not all carriers use the DIM weight pricing model, but most major companies, such as FedEx and USPS, do. Regional carriers and specialized services usually follow flat-rate shipping and other pricing models.

Now that you know how to measure a box and how DIM weight pricing works, the next step would be to find a reliable box provider.

NextDayFlyers offers custom boxes that combine beauty, functionality, and sustainability, containing up to 65% recycled material. These boxes are also sustainably sourced and come from local mills to minimize carbon emissions.

We also offer a user-friendly 3D online design tool, enabling you to customize your box in terms of design, size, and material.