How to Measure an RSC Shipping Box: A Beginner’s Guide
If you’re ordering or manufacturing shipping boxes, knowing how to measure a Regular Slotted Container (RSC) box is essential. Using the correct dimensions helps ensure your products fit properly, reduces shipping issues, and makes it easier to order the right packaging.
This guide explains the process step by step.
What Is an RSC Shipping Box?
An RSC (Regular Slotted Container) is the most common type of corrugated shipping box. It features four flaps on the top and bottom that meet in the center when folded and sealed with tape.
Because RSC boxes are widely used across industries, manufacturers follow a standard method for measuring them.
The Standard Box Dimension Order
RSC shipping boxes are always measured in this order:
Length × Width × Height (L × W × H)
These measurements refer to the inside dimensions of the assembled box unless otherwise specified.
- Length is the longest side of the box opening.
- Width is the shorter side of the box opening.
- Height (or depth) is the distance from the top opening to the bottom of the box.
Following this order helps avoid confusion when ordering boxes.
How to Measure an RSC Box
Step 1: Assemble the Box
Fold the box into its normal shape. Make sure all corners are square and the bottom flaps are folded into place.
Step 2: Measure the Length
Looking at the open top of the box, measure the longest side from one inside wall to the opposite inside wall.
Record this measurement first.
Step 3: Measure the Width
Measure the shorter side of the box opening from one inside wall to the opposite inside wall.
Record this measurement second.
Step 4: Measure the Height
Measure from the inside bottom of the box to the top edge.
Record this measurement last.
For example:
12 × 10 × 8 inches
- Length = 12 inches
- Width = 10 inches
- Height = 8 inches
Why Inside Dimensions Matter
Box manufacturers typically use inside dimensions because they represent the usable space available for your products.
Outside dimensions can vary slightly depending on:
- Corrugated board thickness
- Manufacturing tolerances
- Box style
If you’re matching a product to a box, inside dimensions provide the most accurate fit.
Common Measuring Mistakes
Avoid these common errors:
- Measuring the outside instead of the inside
- Mixing up the length and width
- Measuring a flattened box instead of an assembled one
- Listing dimensions in the wrong order
Double-check your measurements before placing a box order.
Helpful Tips
For the best results:
- Use a rigid tape measure or ruler.
- Measure to the nearest 1/16 inch if precision is important.
- Write dimensions as Length × Width × Height (L × W × H) every time.
- Verify measurements twice before ordering custom packaging.
Final Thoughts
Measuring an RSC shipping box is straightforward once you understand the standard format. Always measure the assembled box from the inside, record the dimensions as Length × Width × Height, and double-check your work before ordering. Following these simple steps will help ensure your products fit properly and your packaging orders are accurate.
If you need custom boxes manufactured, contact us today or head over to our “build a box” page to start the quote process for the type of boxes you need.
