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Free shipping container volume calculator for importers and forwarders. Compare theoretical internal cube for common ISO equipment, apply a usable volume percentage for real-world stuffing, and optionally benchmark your total shipment CBM.
Last updated: April 13, 2026
Need a stuffing or load-plan calculator for your TMS? Get a quote
Illustrative ISO-style internal dimensions; verify with your carrier equipment.
Accounts for voids, dunnage, door area, and imperfect stow—default planning band.
Total shipment cube to compare against capacity.
Theoretical internal cube
67.72 CBM
2,392 ft³ · 4,132,536 in³
59.59 CBM
88% of theoretical · 2,105 ft³
Fill vs usable cube
Enter cargo CBM to see utilization.
Gross mass limits, COG, IMO stowage, and out-of-gauge rules are not modeled here.
Benchmark
Max geometric volume
Starting point before packing loss and stowage rules.
Default mindset
Often 85–92%
Reflects voids, strapping, and operational slack—not a universal constant.
Quick sanity
% of usable cube
See headroom before you commit to a container count.
40′ family
HC vs standard
Toggle presets to compare equipment economics for light, bulky cargo.
One screen
CBM · ft³ · in³
Helps teams that quote in mixed units across regions.
Limits still apply
MGW / VGM / stowage
Gross mass, SOLAS VGM, and hazardous stowage require separate checks.
40′ GP preset, 88% usable volume — theoretical and modeled usable CBM update live in the calculator.
Theoretical
67.7 CBM
Usable (88%)
59.6 CBM
ft³
2,392
Interior
12.03 × 2.35 × 2.39 m
For each equipment preset we multiply interior length, width, and height in meters to get theoretical CBM. We convert to cubic feet and cubic inches for mixed-unit teams. The usable volume applies your percentage to approximate real stuffing efficiency. If you supply cargo CBM, we show utilization against usable space and headroom.
CBM = L × W × H (meters)Custom mode accepts feet and converts to meters using standard conversion.
Floor-loading pallets? Check the pallet weight limit calculator.
Request a custom logistics calculatorHigh-cube equipment adds vertical space that can absorb extra CBM without a second container—when weight and door clearance still work.
Help your team align FCL planning with realistic usable cube.
Suggested hashtags: #Shipping #OceanFreight #FCL #Logistics #thecalcs