20ft vs 40ft vs 40ft High Cube: Container Capacity Guide
Container selection is a tradeoff between internal cube, payload, cargo density and practical loading geometry. Nominal CBM alone does not tell you how many cartons will fit.
Compare representative internal dimensions, CBM and payload for common dry containers and understand practical loading limits.
20ft standard
Hapag-Lloyd publishes a representative 20-foot standard internal size of about 5.900 × 2.352 × 2.395 m with 33.2 m³ nominal capacity and 28,130 kg maximum payload for the example equipment shown.
40ft standard
A representative 40-foot standard is about 12.032 × 2.352 × 2.395 m with 67.7 m³ nominal capacity and 28,750 kg maximum payload. It offers roughly twice the cube of a 20-footer, but not twice the payload.
40ft high cube
The representative 40-foot high cube increases internal height to about 2.700 m and nominal capacity to 76.3 m³ while retaining a similar payload range. It is especially useful when cargo is volume-limited rather than weight-limited.
Why nominal capacity is not usable capacity
Cartons do not tessellate perfectly inside every container. Door openings, dunnage, bracing, pallet footprints and leftover gaps reduce utilization. Container specifications also vary by manufacturer, so confirm the actual equipment for critical plans.
Reviewed September 29, 2026 Carrier-sensitive claims are cross-checked against the source library.
Run the calculation
Estimate identical cartons per 20ft, 40ft and 40ft high-cube container with orientation, payload and volume-utilization checks.