How does the tool estimate my master carton?

Enter your unit size and how many units go in a box, and the calculator finds the most compact whole-unit arrangement — the tightest carton that holds them, in the unit's best orientation — capped at Amazon's 150-units-per-carton limit. Awkward counts get a compact box with a small void rather than a long, thin one.

How many cartons fit on a pallet?

Cartons stack upright on the pallet footprint in even layers, up to the shipping mode's fixed height. The tool shows cartons per layer, the number of layers, and the total cartons and units per pallet.

What do the Air, Truck and Sea modes mean?

Each mode is a fixed shipping envelope: Air is a 125×96 in ULD pallet up to 64 in tall, Truck is a 48×40 in road/FBA pallet up to 72 in, and Sea is a 48×40 in pallet stacked up to 94 in for an ocean container. Truck and sea also show how many pallets fit the matching trailer or container.

What is pallet utilization?

It is how much of the fixed pallet volume your cartons actually fill. The calculator splits it into floor space filled (how much of the footprint a layer covers) and stack height used (how tall your stack is versus the maximum) — multiply the two and you get the overall utilization. Empty space is volume you pay to ship.

Can I use centimetres?

Yes. Toggle between inches and centimetres at any time. Your entered measurements convert automatically, so switching units never changes the physical size of your product or carton.

Does it tip pallets on their side to fit more?

No. A loaded pallet can only stand upright and rotate 90° on the floor, so the pallet and vehicle counts reflect how freight is really loaded. If a carton is bigger than the pallet footprint, or a pallet is taller than the vehicle interior, none fit — exactly as in real life.

FBA Pallet Calculator

Units per carton, pallet, and shipping container

Start from an example

Unit & carton

Unit dimensions (in)

lengthwidthheight

Units per carton

Estimated carton

20 × 16 × 12 in · 2 × 2 × 2 units

Ship as

Pallet utilization

90%

Efficient

Floor space filled100%

Stack height used90%

units / carton

cartons / pallet

240

units / pallet

your cartons wasted air

From one unit to a fully packed pallet

Estimate your master carton
Enter your unit size and how many units go in a box; the calculator estimates the tightest master carton — the most compact whole-unit arrangement — capped at Amazon's 150 units per carton.
Cartons per pallet
Cartons stack upright on the pallet in even layers within each mode's fixed height. The tool shows cartons per layer, number of layers, and total units per pallet.
Air, truck or sea
Pick a shipping mode with a fixed footprint and height — an air ULD, a road/FBA pallet, or an ocean-container pallet — and see how many pallets and units fit the matching vehicle.
Efficiency, not just a count
The pallet is a fixed shipping volume. The calculator splits utilization into floor coverage and stack height, so you can see exactly where you are paying to ship empty air.
Inches or centimetres
Switch between inches and centimetres at any time; your measurements convert automatically so the physical product stays the same size.
Supplier spec sheet
Copy or print a clean spec sheet — units per carton, cartons per pallet, pallet height, units per vehicle — to send straight to your factory or freight forwarder.

FBA Pallet Calculator

From one unit to a fully packed pallet

Carton, pallet & packing efficiency