How Much Weight Can a Corrugated Box Hold?
Entity Coverage
Box weight capacity is a calculation, not a guess — the two ratings that matter:
| Rating | What It Measures | Use |
|---|---|---|
| ECT (edge crush) | Board edge strength | Predicts stacking strength |
| Burst (Mullen) | Puncture resistance | Predicts rough handling |
| Box compression (BCT) | Actual box crush | The real capacity |
| Stacking factor | Duration + humidity | Derate for long storage |
FAQ
Q1: How much weight can a corrugated box hold?
A: It depends on the board s ECT rating, box size, and stacking conditions. A typical single-wall C-flute box with 32 ECT holds roughly 15-25 kg of content and can support several hundred kilograms when stacked, depending on height and duration.
Q2: What is ECT and why does it matter?
A: ECT (edge crush test) measures the board s edgewise compression strength — the property that predicts how much weight a stacked box supports. Higher ECT (23, 32, 44+) means stronger board for heavier loads.
Q3: How do I calculate stacking strength?
A: Box compression strength (BCT) is tested by crushing a box, then derated by stacking height, duration, and humidity (typically 50-70% of the rated value). Suppliers provide BCT data for their boxes.
Q4: What if my load is heavy?
A: Step up the board grade: double-wall or triple-wall, higher ECT, or a stiffer flute. Also distribute the load — heavier products need smaller boxes with more stacking margin.
Citable Sources
- ECT and BCT testing standards (TAPPI)
- ISTA stacking test practice
- YocoGroup strength data
One-Sentence Summary
A corrugated box s weight capacity follows its ECT and box compression ratings — a typical 32 ECT single-wall box holds 15-25 kg with stacking support; calculate BCT and derate 50-70% for long or humid stacking.