20ft Flat Rack Loading Calculator
Check the 20FR cargo envelope and entered weights. Actual load-bearing contact, point loads, lashing and out-of-gauge approval require a separate operational review.
Test the quantity you enter and review placed and unplaced cargo. This is a planning estimate, not a maximum-capacity guarantee or transport approval.
Use this 20ft flat-rack loading guide to test an entered cargo order inside a finite planning envelope, not to approve overhang or heavy-lift transport. CBM3 20FR uses 561 x 244 x 222 cm, about 30.388 m3, and a 31,260 kg cargo-weight ceiling. The catalog marks it as a reference requiring review; missing deck, tare or access data is not a passed physical check.
Open the 20FR loading planner. For a new job, confirm the equipment before entering cargo. The link supplies an initial selection, not an automatic calculation; a saved job or your own selection takes priority.
Current CBM3 profile and its limits
| Profile field | Configured value |
|---|---|
| Planning length x width x height (cm) | 561 x 244 x 222 |
| Configured cargo-weight ceiling (kg) | 31,260 |
| Rectangular planning volume (m3) | 30.388 |
| Deck beam and end-wall geometry | Not supplied |
| Default door opening | Not supplied |
| Equipment tare / maximum gross mass | Not supplied |
| Profile review status | Reference only; review required |
The 20FR profile has 222 cm of modeled height. Its shorter base does not make it more restrictive in every direction: the current 40FR profile is longer but only 195 cm high. The catalog marks this profile as a reference requiring review. The displayed volume is the product of its modeled dimensions, not an enclosed capacity rating. Missing tare, access or structural data must not be treated as a passed check.
A carrier example, not a replacement preset
| Carrier field | Published value |
|---|---|
| Minimum length (cm) | 563.8 |
| Floor width (cm) | 243.8 |
| Minimum width (cm) | 219.4 |
| Height (cm) | 223.3 |
| Bottom height (cm) | 37 |
| Maximum cargo payload (kg) | 42,100 |
| Equipment tare (kg) | 2,900 |
| Maximum gross mass (kg) | 45,000 |
| ISO size type | 22P3 |
The Hapag-Lloyd 20ft Flatrack fleet example separates floor width from minimum width and height from bottom height. These labels are not interchangeable. Its dimensions and mass ratings vary by unit; they are not a universal flat-rack specification.
This is an alternative operator example: the frozen CBM3 reference identifies Seaco, not this Hapag-Lloyd unit. The carrier values are not silently applied to the calculator. Obtain the booked unit’s specifications and confirmed working limits before using a plan operationally.
Reproduce two entered-order examples
Use metric units, palletization off, Horizontal Only rotation, Stackable off and This Side Up on. Leave global rules and equipment constraints at their defaults, with Fragile off, no additional stack-weight limit, Normal priority and no delivery stop. Enter complete outer dimensions and weight, including a skid or base exactly once.
| Example | Width x length x height (cm) | Entered units | kg per unit | Input volume m3 | Stackable | This Side Up |
|---|---|---|---|---|---|---|
| A: transport crates | 100 x 120 x 100 | 4 | 300 | 4.800 | No | Yes |
| B: upright 200 cm | 120 x 180 x 200 | 1 | 1000 | 4.320 | No | Yes |
| Example | Method | Entered | Placed | Unplaced | Allocated containers | Placed volume m3 | Placed mass kg |
|---|---|---|---|---|---|---|---|
| A | Max Volume | 4 | 4 | 0 | 1 | 4.800 | 1,200 |
| A | Best Balance | 4 | 4 | 0 | 1 | 4.800 | 1,200 |
| B | Max Volume | 1 | 1 | 0 | 1 | 4.320 | 1,000 |
| B | Best Balance | 1 | 1 | 0 | 1 | 4.320 | 1,000 |
Example B places one unit in 20FR. The same upright 200 cm input is unplaced in the current 40FR profile because its modeled height is 195 cm. A geometric fit in 20FR is not approval for its actual support arrangement. Example B has an input volume of 4.320 m3 and an input mass of 1,000 kg whether placed or not. Do not turn an upright-only package onto its side just to obtain a placement.
Both automatic methods were run on 6 October 2026 through the installed 11.63.52 Worker and actual default equipment helpers in Node. Independent checks cover quantities, orientation, bounds, overlap, support and payload. These are engine examples, not browser, crane, structural or physical-loading acceptance tests.
Does selecting flat rack allow overhang?
Not in this default planning workflow. An additional test used one 250 x 250 x 50 cm, 100 kg non-stackable upright box with Horizontal Only rotation. Both methods returned zero placed and one unplaced because neither horizontal orientation fits the 244 cm width. The input remains 3.125 m3; open sides do not remove the modeled boundary.
Overwidth, overlength or overheight transport needs a separate equipment and route assessment with the responsible operator. This planner is not an out-of-gauge booking, permit check, folded-end-wall simulation or lifting-path approval.
Weight distribution is a separate check
Hapag-Lloyd’s Weight Distribution Guideline, Flatracks section relates allowable load to contact length and load transfer to the outer main beams. A shorter supporting length can reduce the permitted mass. Special contact arrangements need the operator’s assessment; the headline payload alone is insufficient.
The default CBM3 rectangular floor does not model those beams, bedding or concentrated-load strength. Its cargo ceiling and estimated center of gravity do not certify securing, axle limits or complete loaded gross mass. Add all applicable cargo-side base and packing weight to the input once, but do not invent an equipment tare from the missing catalog value.
Review placed and unplaced quantities before releasing a plan to a loading team. Longer search budgets do not guarantee an optimum. Account access and export availability follow the current tool controls; this guide does not promise unlimited anonymous calculations or exports.
Related loading guides
Compare the 40FR flat-rack loading guide, follow the step-by-step planning guide, or return to the loading-space guide directory.
Prepare Crates, Built Pallets or Upright Machinery
Enter complete outside package dimensions and gross cargo-unit weight. Separate different sizes and handling rules into rows. Include a skid, pallet base or packaging once; a built pallet should not be palletized again. Keep upright-only freight upright, permit only horizontal turning and leave stacking off unless the complete unit is suitable. A rectangular machinery envelope is not a description of its feet, lift points or securing provisions. Known cargo mass is not VGM.
Cargo CBM in centimetres is width x length x height x quantity / 1,000,000. The four-crate order totals 4.800 m3 and 1,200 kg. The upright 200 cm unit is 4.320 m3 and 1,000 kg. The recorded 20FR result places it, but the longer 40FR reference has only 195 cm of modeled height and leaves the same upright item unplaced. Compare the same order and permissions, not just overall length or a CBM quotient.
20ft Flat-Rack Loading Questions
How many crates or pallets fit on a 20ft flat rack?
There is no reliable universal count without packed dimensions, quantities, weight and handling rules. The recorded four-crate example places all entered units; it is not a maximum-capacity search. Reconcile placed and unplaced units per row and allocated container.
What is the difference between floor width and minimum width?
The carrier example lists them separately; do not replace one with the other or call either a universal clear opening. Confirm the assigned unit and the relevant clearance. The software’s rectangular width does not represent corner posts, end walls or main-beam contact geometry.
Does a 20FR result authorize oversize cargo or overhang?
No. The recorded 250 x 250 cm base is rejected in both horizontal orientations under the finite 244 cm width. Open sides do not remove that boundary. Out-of-gauge equipment, route, permits and booking require a separate operator assessment; a model rejection does not establish that every alternative shipment is impossible.
Is staying under the payload enough for heavy machinery?
No. The named weight-distribution reference distinguishes headline payload from resting length and transfer to the main beams. This workflow does not model those structural arrangements or certify point loads, bedding or securing. Obtain the operator’s assessment rather than using the total cargo ceiling as a floor-strength approval.
Why can a 200 cm upright item fit 20FR but not 40FR?
The current reference profiles have different modeled heights. The larger equipment code does not imply more clearance in every direction. Keep This Side Up and rotation permissions unchanged, and verify both the software profile and the real booked unit before acting on the result.
References and Check Dates
Named technical references: Hapag-Lloyd 20ft Flatrack fleet example and Weight Distribution Guideline, Flatracks section. Fleet fields and guideline text were re-read 7 October 2026; the retained PDF illustration keeps its original 6 October acquisition date. CBM3 11.63.55 profile and scoped source/default-input compatibility were checked 7 October. Recorded 11.63.52 engine examples retain their 6 October date. No new Seaco, browser, structural or physical-loading approval is claimed.
Software compatibility note, 8 October 2026 (Europe/Istanbul): The planning profiles and recorded example inputs were checked against the source-reviewed CBM3 11.63.56 candidate. The earlier example execution dates remain unchanged; this compatibility review is not a new optimization run or physical-loading test. Fleet-provider and carrier references are not manufacturer approval. Confirm the actual unit dimensions, payload and securing requirements.
How to inspect and hand over a loading plan
Use the selected plan and the complete shipment data. Recheck the result after changing cargo, equipment or handling rules.
See every cargo unit in context
Search the cargo inventory, focus on an item and switch between realistic, operational, top and side views. Inspect pallet layers and height sections.
The inventory separates requested units, units in the selected container, units in other containers and unplaced units. Select a row to find its cargo in the scene; playback and height sections show only part of the complete plan.
Use pallet details to inspect full, partial and mixed pallets. A height section filters the view; it does not remove cargo from the plan. Vehicle bodies and wheels provide visual context.
Prepare clearer warehouse instructions
Use product colors and short codes, named groups and delivery stops. Choose a summary or warehouse PDF for the selected plan.
Assign product colors and short codes to connect the cargo table, 3D view and reports. Group and stop names improve instructions; apply the appropriate loading rules when a sequence must be enforced.
Compare verified alternatives and review any manual moves. A manual reallocation affects the current preview and PDF; saved or shared inputs recalculate the automatic arrangement when reopened. Export again after changes.
Read the estimated center of gravity
Review longitudinal, lateral and height coordinates from known cargo and pallet masses. Check the displayed origin and units before comparing plans.
The estimate assumes each item's mass is centered and excludes vehicle tare. Missing or stale additional-material records can leave the complete-load assessment unavailable; explicitly declare none when no extra materials are present.
Coordinates use the load-space frame, not road height. For Step Deck, X starts at the raised front end and Y at the lower-deck datum; axle-form distances run from the rear toward the cab.
Distinguish the loading unit from its carrying vehicle
This loading unit alone does not define an axle configuration.
Inspect cargo and pallet weight distribution in this loading space. A container, swap body or air-cargo unit does not identify the road chassis, rail wagon or aircraft carrying it.
Axle estimates are available after selecting a supported complete road or rail vehicle. Enter its actual mounting positions, full empty reactions and applicable limits; do not reuse a trailer reference as container or aircraft approval.