Shipping Container Load Calculator (20' · 40' · 40'HC · 53')
Calculate maximum pallet capacity, loose carton stuffing, cube utilization, and road-legal payload limits.
Top-Down Container Floor Blueprint
Visualizing 12 pallet floor spots in 40ft High Cube Container (40' HC)
- Volumetric fill is only 47.5%. Consider double-stacking or consolidating additional cargo to maximize ocean freight cost efficiency.
Standard Shipping Container Dimensions & Capacities Reference
Standardized ISO ocean containers (20ft, 40ft, 40ft High Cube) and 53ft domestic intermodal equipment payload and volume specifications:
| Container Type | Internal Dimensions (L × W × H) | Cubic Volume | Standard 48"×40" Pallets | Euro 1200×800 Pallets | Max Cargo Payload |
|---|---|---|---|---|---|
| 20ft Standard (20' GP) | 19'4" × 7'8" × 7'10" | 1,172 cu ft (33.2 m³) | 10 (single tier) | 11 | ~55,000 lbs (25,000 kg) |
| 40ft Standard (40' GP) | 39'6" × 7'8" × 7'10" | 2,390 cu ft (67.7 m³) | 20 – 21 | 24 – 25 | ~58,500 lbs (26,500 kg) |
| 40ft High Cube (40' HC) | 39'6" × 7'8" × 8'10" | 2,694 cu ft (76.3 m³) | 20 (up to 40 stacked) | 24 (up to 48 stacked) | ~58,300 lbs (26,450 kg) |
| 53ft Domestic Intermodal | 52'6" × 8'2" × 8'11" | 3,850 cu ft (109.0 m³) | 26 – 30 (pinwheel) | 33 | ~45,000 lbs (DOT limit) |
Container Loading Frequently Asked Questions
What is the difference between a 40ft Standard and 40ft High Cube?
A 40ft High Cube container has an additional 1 foot of internal height (106 inches vs 94 inches), providing roughly 304 cubic feet more space. This makes it ideal for double-stacking standard pallets under 50 inches each.
Why is a 53ft Intermodal container limited to 45,000 lbs when a 20ft holds 55,000 lbs?
Ocean shipping containers are regulated by maritime strength specs, allowing 20ft containers to carry up to 55,000 lbs at sea. However, 53ft containers travel across US highways by truck, where the Federal Bridge Formula caps gross vehicle weight at 80,000 lbs, restricting cargo payload to roughly 43,000–45,000 lbs.
What is Pinwheeling pallets in a container?
Pinwheeling means turning one pallet lengthwise (48x40) and the adjacent pallet widthwise (40x48) across the width of a container or trailer. Because domestic 53ft containers are 98.5 inches wide, pinwheeling fits 2 rows comfortably, increasing floor capacity from 26 to 30 pallets.
International Maritime Container Standards
Standard intermodal shipping container corner fittings, gross mass ratings, and structural load ratings conform to ISO 668 and ISO 1496 conventions tracked by the World Shipping Council (WSC) and the International Maritime Organization (IMO) .