Packing & Export

Carton Edge Crush (ECT) & Container Stacking Calculator

The bottom carton carries the whole stack for the whole voyage. Board strength decays with humidity and time, which is what the safety factor is for.

Board & Box Carton
N/mm
mm
mm
mm
mm
Load & Container Stacking
kg
×
mm

Box Compression Strength

— N

McKee prediction for a new, dry carton

Stacking Limits

Allowable Load on Bottom Carton
— N
Cartons That May Stack Above
— no.
Stack Height by Strength
— cartons
Stack Height by Container
— cartons
Governing Stack Height
— cartons
Load Carried by Bottom Carton
— kg

McKee describes a new carton in a dry laboratory. Real cartons lose a large fraction of that strength to humidity, to time under sustained load, and to every hand-hole, print panel and misaligned stack — which is why the safety factor is typically five or more for long sea freight rather than a nominal two.

Carton Edge Crush (ECT) & Container Stacking Calculator — free, with the formula and a worked example, at Textile School.