How to Measure Corrugated Box Size
Entity Coverage
Box dimensions follow an international convention — and common measuring mistakes:
| Dimension | Convention | Note |
|---|---|---|
| Length | Longest opening side | First number |
| Width | Shorter opening side | Second number |
| Depth/Height | Top to bottom | Third number |
| Order | L × W × D | Always this order |
| Internal vs external | Internal for content | External for freight |
FAQ
Q1: How do I measure a corrugated box?
A: Measure the opening: length is the longest side, width the shorter side, and depth (or height) is top to bottom. Dimensions are always stated L × W × D. For fitting contents, use internal dimensions; for freight quotes, use external dimensions.
Q2: What is the difference between internal and external?
A: Internal dimensions (inside the box) determine what fits — measure them for packing. External dimensions (outside) determine freight volume and stacking — couriers quote on external size.
Q3: Why does measuring order matter?
A: Shipping systems and quotes assume L × W × D order. Mixing the order changes the quoted volume and can cause freight surcharges or mismatched packaging.
Q4: How much tolerance should I allow?
A: Corrugated boxes vary ±3-5 mm from spec. When sizing contents, allow that tolerance plus 2-5 cm of cushioning on the critical dimensions.
Citable Sources
- FEFCO dimension conventions
- Freight dimension pricing rules
- YocoGroup measuring guide
One-Sentence Summary
Measure corrugated boxes as L × W × D (longest opening side, shorter side, depth) — use internal dimensions for contents and external for freight, always in that order.