Plan a mixed load in 3D. Catch what fails at the dock.
Real bin-packing across mixed carton sizes with weight and stacking limits, then drag any carton by hand. Door aperture, axle loads, crush strength, overhang and load voids are all checked before the truck leaves. Free, in the browser, no signup.
Live numbers — computed by the optimizer in your browser right now.
Drag a box to move it · arrows nudge · R rotate · Del delete · ⌘Z undo · drag empty space to orbit · scroll to zoom. Moves snap to a 1cm grid and are blocked when boxes would overlap.
The problems that surface at the last step
None of these are hypothetical. They happen to mature, experienced teams — at the dock, at the weighbridge, at delivery — exactly when fixing them costs the most. Every one is catchable at planning time.
"The pallets were planned against the container's internal height — they don't clear the door header."
💸 Restuffing at the port, per-diem charges, a missed vessel.
The door opening sits ~10 cm below the ceiling (2.28 m vs 2.39 m), and the forklift still needs room to lift and tilt. We check every carton against the DOOR while you plan.
Door clearance"The truck is legal on gross weight — and still gets cited. The rear axle group is over."
💸 A weigh-station citation, then offloading at a transload yard to redistribute.
Axle-group violations are among the most common weigh-station citations. Every carton's weight splits kingpin vs tandems by the lever rule, live, as you drag.
Axle loads"The consignee filed a damage claim — the bottom layer buckled somewhere at sea."
💸 Industry analyses trace roughly two-thirds of intermodal cargo claims to poor packing — and Amazon rejects overhanging pallets outright.
Crush limits per carton from the board grade (McKee), heavy-over-light warnings, and pallet-overhang flags — all live while you plan.
Crush & stacking"The aisle was measured for straight travel — the truck can't make the right-angle turn into the rack bay."
💸 Re-slotting a live warehouse with full racks.
Right-angle stacking needs more room than straight travel — a classic layout mistake. We check the straight width AND the 90° turn box separately; tight corners flag red before you commit.
Right-angle turnsWork out your pallets
Four questions, in the order they come up. Every answer uses the same shared pallet maths — so the count on one page can never disagree with the next.
Cartons per layer, layers to max height, capped by the pallet weight rating.
220ft and 40ft floor patterns, double-stacking by loaded height, payload-capped.
3Pallet positions to square footage and m², including forklift aisles.
43PL or own-warehouse cost per pallet per month, at your rate.
One tool for every level of the load
Fill a container
Optimize mixed cartons in 3D, drag to adjust, export the plan.
OpenSize a carton
How many units fit per carton, and what each unit costs to ship.
OpenPick a container size
Instant carton count & CBM for 20GP / 40GP / 40HQ.
Open BetaArrange the warehouse floor
Pallet rows, forklift aisles, and live dock-reachability checks.
OpenCheck Amazon FBA fees
2025 size tiers and fulfilment fee estimates for your product.
OpenFree shipping & warehouse calculators
Quick single-purpose tools — no signup. Every one shows its formula and assumptions, and works in metric or imperial.
CBM Calculator
Carton → total cubic meters, container fit & air chargeable weight.
Dimensional Weight Calculator
Billable / DIM weight for FBA, UPS, FedEx, DHL & air freight.
Pallet Calculator
Cartons per pallet, layers, and pallets needed for an order.
Pallet Storage Cost Calculator
Estimate 3PL / warehouse storage cost per pallet, per month.
Warehouse Space Calculator
Pallet count → floor area in square footage and m².
Forklift Aisle Width Calculator
The right-angle stacking aisle your forklift really needs.
Cartons in, load plan out
If you can drag a box, you can plan a container.
Type your cartons, hit Optimise
- Sizes, weights, quantities — mark fragile or this-way-up
- Real bin-packing fills the container, respecting weight & stacking limits
- Then drag any carton in 3D — moves snap to grid and never overlap
Export a plan your warehouse can follow
- PDF load plan — 3D snapshot, stats, load zones
- CSV packing list — every carton with its exact position
- The deliverable commercial tools charge $350–$5,000/yr for
Watch the checks fire
Real product, real engine — recorded straight from the browser, no staging. Every drag re-runs the physics.
Warehouse: click a pallet — the forklift route and clearance band draw themselves; drag it across an aisle and cut-off stock flags red instantly.
Container: a packed 20' GP — drag any carton and collisions, stacking rules and stats re-check on every move.
Or start from a real scenario
One click loads the full example — cartons, constraints, everything.
One engine. One plan. Every layer of your team.
The bin-packing engine and its reality checks sit at the core. Around it, the same plan becomes what each person actually needs — nobody re-types anything.
The planner
Imports the carton list from Excel, optimizes in 3D, drags to fine-tune — every move re-checked live.
The manager
Gets a review link — approve or request changes, with a full audit trail of who changed what.
The loading crew
Gets the numbered loading sheet — #1 first, back of the container, floor level. Taped at the door.
The paperwork
VGM (cargo + tare), axle splits and weights come off the same plan — no side calculations.
Why the number is right
| Spreadsheet | DimPack3D | Commercial | |
|---|---|---|---|
| 3D bin-packing | ✗ | ✓ | ✓ |
| Weight & stack limits | ✗ | ✓ | ✓ |
| Drag-edit in 3D | ✗ | ✓ | some |
| PDF plan + packing list | ✗ | ✓ | ✓ |
| Price / year | $0 | $0 | $350–5,000+ |
Every placement must pass:
- Full 3D collision check — no overlaps, ever
- ≥60% base support — nothing floats
- Stack loads propagate down and respect per-carton limits
- Container payload enforced (28.2t / 26.7t / 26.5t)
- Heavy cartons first — centre of gravity stays low, with live balance warning
Reality checks — what the floor actually fights with
A plan that ignores the door, the corner, the axle or the slab is a drawing, not a plan. These checks run live on every layout — most tools don't have them.
The most common loading mistake: planning against the 239 cm interior when the door header is 228 cm. Cartons that can't pass the door are flagged while you plan.
Straight aisle width and the square a forklift needs to TURN are different numbers. Straight-line reachable but corner-blocked pallets turn red.
Every carton's weight splits kingpin vs rear axles by the lever rule — live totals against legal limits, with fix direction.
Max load on top per carton — estimable from ECT board grade (McKee formula), enforced down through the stack.
A 4-level rack bay is 2.4 t on 3 m². Pick your slab rating (mezzanine to heavy slab) — overloaded spots turn red.
Overhang costs ~30% compression strength, and Amazon rejects overhanging pallets outright. Allow 2.5 or 5 cm per side — we pack it AND warn you.
Chilled, frozen or hazmat cargo outside its matching zone turns red the moment you drop it.
CoG height over 55% or a carton ≥25% heavier than the one beneath it — the loader's instinct, codified.
The PDF numbers every carton in loading order — #1 first, back of the container, floor level. Tape it at the door.
Questions, answered
Is it really free?+
Yes — planning and optimizing are free. Exporting PDF/CSV just asks for your email.
Do I need to install anything?+
No. It runs in your browser, desktop or tablet.
Where does my data go?+
Nowhere — everything computes on your device. Shipment data never leaves your browser.
Mixed carton sizes? Weight limits?+
Yes. Mixed sizes, payload limits, per-carton stacking limits, fragile cartons and unload order are all supported.
What is the maximum pallet height for a container?+
Plan against the door, not the ceiling. A standard container's door header is ~2.28 m — about 10 cm below the 2.39 m interior — and the forklift needs room to lift and tilt, so loaded pallets are typically planned at 2.15–2.20 m (high-cube doors: ~2.58 m). The planner checks every carton against the door aperture automatically.
Your next container, planned in minutes
Free. In the browser. Nothing to install.
Open the Load Planner