Measure a Regular Slotted Carton Shipping Box

How to measure a Regular Slotted Carton Shipping Box is a question that frequently comes up. The formula is simple: Length x Width x Depth, where the “Length” should always be the longer side of the box. To measure a box may seem very simple to some people, while it gets confusing to others. Keep in mind three important things:

  • Length x Width x Depth (height). With the assembled box and a measuring tape in your hands, determine the longest side of the box. Measure that side of the box, placing your measure tape horizontally inside the box. That will be your Length.

Now measure the inside of the smaller side of the box. It will be you Width.

Last, but not least, place your measure tape vertically from the bottom of the box, to the limit of the lateral wall. Do not include the flaps in this measurement and remember to always go from score (where the box folds) to score. That will show you the height, or the Depth of your box. Now that you already have the 3 measurements that you need, express them in this exact order: Length x Width x Depth.

See the example below:

Measure a Regular Slotted Carton Shipping Box 1

18” x 12” x 9”. This box is 18 inches long, 12 inches wide, and 9 inches deep.

  • Have in mind that the box measurements always correspond to the inner dimensions of the box and you measure from score (where the box folds) to score. We do not measure the flaps of the box. In that way, it’s possible to ensure that the box will fit and protect your product comfortably. Be sure to allow a minimum of 1/8 of an inch extra to each dimension in order to have a snug fitting.

Note that the length and the width measures are supposed to correspond to the opening of the box. Remember that the length always corresponds to the longer side of the box, what that means is the length will always be longer than the Width.

Measure a Regular Slotted Carton Shipping Box 2

Important: Do not measure the flaps of the box. Flaps are the parts that fold to close the box.

Last but not least, be sure you and your box provider are both using the   “Imperial”,  “English Measuring System”, which uses inches and feet. In the US, in most of the cases, boxes measurements are expressed in inches: E.G.:  The box on Step 1 measure is 18” x 12” x 9”, what that means is the box is 18 inches long, 12 inches wide, and 9 inches deep.

If you have a sample box in hand, and you would like to order more regular shipping brown boxes like the one you have, you can simply measure it open:

How to measure a regular shipping box open?

In order to measure an open corrugated box, first you have to fully open the carton until it becomes a flat cardboard sheet. Use the 3 Steps above, and be sure to write your measure in the formula: Length x Width x Depth (height), where the “Length” should represent the longer side of the box.  This type of measuring is very useful when quoting for Die-Cut Boxes, which is a type of box manufactured with the use of shaped die-cutting tools.

Measure a Regular Slotted Carton Shipping Box 3

How to find the specs for a RSC – Regular Slotted Carton?

A Regular Slotted Carton is the most common type of corrugated box. There is no special tooling required to manufacture this style box.  RSCs can be measured by using the same 3 Steps above, and the formula: Length x Width x Depth (height).  Always measure using inside dimensions.

If you need further help to figure out how to measure your box, or if you would like to have information about any of our Packaging Solutions, please call 713.559.0570, or e-mail us at

Request A Quote

Very good people fast loading and helpful staff FORKLIFT guy super nice all staff very good. I WISH I CAN COME AGAIN
04:30 26 Oct 18
I have now toured SCHCI several times and am extremely impressed with their Houston warehousing and fulfillment operations. If you did not know better, you would think you were in a clean room environment. For a warehouse that handles everything from corrugated goods to extremely heavy slabs, everything is meticulously clean and organized. This has to been one of the best warehouse and inventory handling companies I have toured and had the pleasure of working with. If you need a first class operation at a very fair price, SCHCI and their team of professionals is second to none.
Steve Winter
Steve Winter
00:54 16 Jan 18
Awesome company. They always provide fast service. Great customer support.
capt dale
capt dale
15:42 07 Feb 18
Have been working with SCHC for years now and they have always been great! The packaging is always spot on and we always get super fast deliveries. Thanks Suzy and the SCHC crew for doing an amazing job!
nate honrath
nate honrath
20:25 05 May 17
boys who load trucks just need to know how to load and when you tell them how to load the load they just have to load it as they say
Cris Nicco
Cris Nicco
03:05 29 Jul 18
Measure a Regular Slotted Carton Shipping Box 4