Freight Cost Per Unit & FBA Landed Cost — How to Calculate It

For e-commerce importers and Amazon FBA sellers, the single most important logistics number is the landed freight cost per unit: your total all-in container cost divided by the number of sellable units inside it. It converts a scary four-figure freight invoice into the only form that matters for pricing — dollars per unit.

The calculation

Freight cost per unit = (ocean freight + origin charges + destination charges + customs clearance) ÷ units in the shipment

Example: a 40ft FCL at $4,500 all-in carrying 2,800 units = $1.61 per unit. The calculator does this live, including the case where your order spills into a second container — which is exactly when per-unit cost jumps and margins quietly die.

Why carton dimensions are a profit lever

Container space is bought in fixed chunks, so every centimetre of wasted carton is money. Shaving packaging so 10% more units fit in the same 40ft container cuts freight cost per unit by roughly 10% — with zero change to the product. Practical levers: right-sizing the export carton to the product, negotiating master-carton quantities with the factory, and checking how cartons tile against container dimensions (our pallet guide covers the palletised case).

The minimum viable price formula

Minimum price = product cost + freight cost per unit + import duty per unit + fulfilment fees + target margin

Freight per unit is the input sellers most often estimate instead of calculating — and the one that swings hardest between a half-empty and a well-packed container. Run it before committing to an order quantity, not after the goods ship.

Watch the second-container cliff

Per-unit economics are discontinuous: 2,900 units may fit one container at $1.55/unit, while 3,100 units force a second container and push the blended cost to $2.90/unit. If your order lands just over a container boundary, it is often more profitable to trim the order or resize cartons than to ship a nearly-empty second box. The calculator’s “containers needed” readout exists precisely to catch this before you commit.

The second-container cliff

Freight cost per unit does not fall smoothly as you order more — it steps. Because containers come in fixed sizes, your per-unit cost drops as you fill one, then jumps the moment your order spills into a second. Imagine a 40ft FCL at $4,500 that holds 2,900 units: that is $1.55/unit. Order 3,100 units and you now need a second container — $9,000 for 3,100 units, or $2.90/unit. Two hundred extra units nearly doubled your freight cost per unit. This is the single most important dynamic for FBA sellers to understand, and it is exactly what the calculator’s “containers needed” readout is designed to expose before you commit to an order quantity.

Building your true landed cost

Freight per unit is one input into landed cost, not the whole thing. The full stack an FBA seller must price against is:

• Product cost (FOB price from supplier)
• Freight per unit (all-in container cost ÷ units)
• Import duty per unit (tariff rate applied to the customs value)
• Destination and customs clearance per unit
• FBA fulfilment fees (fulfilment + monthly storage)

Miss any layer and your margin calculation is fiction. The two most commonly forgotten are duty (sellers assume the FOB price is the landed price) and storage fees (which compound if inventory sits, quietly eating the margin on slow movers).

The minimum viable price formula

Minimum price = product cost + freight/unit + duty/unit + fulfilment fees + target margin.

Work this out before committing to an order, not after the goods land. The number that swings hardest between a good and a bad decision is freight per unit — and it is the one sellers most often estimate rather than calculate. A container packed to 60% versus 90% can shift freight per unit by 30–50%, which for a thin-margin product is the entire difference between profit and loss.

Carton optimisation is the highest-leverage lever

Container space is bought in fixed chunks, so every wasted centimetre is money left on the table. If a small packaging redesign lets 10% more units fit the same 40ft container, your freight cost per unit falls by roughly 10% — with zero change to the product itself. Practical moves: right-size the export carton to the product (eliminate void fill), negotiate master-carton counts with the factory so cartons tile the container efficiently, and check how your cartons stack against container dimensions rather than assuming. For a seller shipping thousands of units, this is often a larger margin gain than renegotiating the product price.

Worked example

A 40ft FCL costs $4,800 all-in and fits 3,000 units of a homeware product. Freight per unit is $1.60. Product cost is $6.00, duty is 4.7% ($0.28), FBA fees are $3.20, and you want a $4 margin. Minimum viable price = 6.00 + 1.60 + 0.28 + 3.20 + 4.00 = $15.08. If a carton redesign raises the fit to 3,400 units, freight drops to $1.41 and your floor price falls, widening your competitive room on the marketplace. Model your own case in the calculator.