CBM Calculator for Amazon FBA
Model uniform FBA cartons in cubic metres, decide LCL vs FCL and work out how many cartons fit in a 20ft or 40ft container — pre-loaded with a sample 400-carton shipment plan.
Key takeaways
- FBA ships in uniform cartons — model them as one SKU row repeated across many cartons in the batch tab.
- Amazon carton limits (usually 25 kg / 63.5 cm longest side for standard) drive your per-carton CBM.
- A 40ft container of typical FBA cartons holds roughly 1,000–1,400 cartons depending on size.
- Plan CBM before booking so you pick LCL vs FCL and the right container at the best rate.
FBA shipments are uniform by design
One carton, repeated many times — perfect for the batch tab.
Amazon FBA sends the same carton many times. In the batch tab, add one SKU row with your carton dimensions and set the carton quantity to your shipment size — the calculator totals CBM across all cartons and shows the container fill. Keep cartons under Amazon's standard limits (about 25 kg and 63.5 cm on the longest side) so they're easy to receive, and uniform cartons stack tightly for the best usable CBM per container.
- A 40ft container gives roughly 58 CBM usable; a 40ft HC about 68 CBM.
- That's typically 1,000–1,400 standard FBA cartons per 40ft, depending on carton size.
- Plan CBM before booking so you pick LCL vs FCL and the right container at the best rate.
Worked example — 400 FBA cartons
Each carton 40 × 30 × 25 cm, 8 kg.
| Step | Result |
|---|---|
| Per-carton volume | 0.4 × 0.3 × 0.25 = 0.030 m³ |
| Total volume (× 400) | 12.00 CBM |
| Total weight (× 400) | 3,200 kg → 3.20 CBM-equivalent |
| Chargeable volume (W/M rule) | 12.00 CBM (volume wins) |
| 20ft container fill | 12.00 / 28 ≈ 43% used |
| LCL vs FCL | 12 CBM < 15 → LCL still wins |
At 12 CBM this shipment is just under the ~15 CBM LCL/FCL break-even, so LCL is usually cheaper. Push it past 15 CBM and a 20ft FCL starts to win — the calculator's utilisation bar shows the cross-over as you raise the carton count. At a typical $60/CBM the freight is about $720.
Amazon FBA shipping FAQs
The shipment-plan questions before you book.
How do I calculate CBM for an Amazon FBA shipment?+
FBA sends the same carton many times. In the batch tab, add one SKU row with your carton dimensions and set the carton quantity to your shipment size — the calculator totals CBM across all cartons and shows the container fill.
What carton size works best for FBA?+
Keep cartons under Amazon's standard limits (about 25 kg and 63.5 cm on the longest side) so they're easier to receive. Uniform cartons also stack tightly, raising your usable CBM per container.
How many FBA cartons fit in a container?+
A 40ft container gives roughly 58 CBM usable, a 40ft HC about 68 CBM. Divide your per-carton CBM into that to estimate carton count — typically 1,000–1,400 standard FBA cartons per 40ft.
Should I use LCL or FCL for FBA?+
Small probation shipments (under ~15 CBM) suit LCL; once a single shipment clears that, a 20ft or 40ft FCL is usually cheaper per unit. The calculator's utilisation bar shows the break-even as you add cartons.
Calculate your FBA shipment
Pre-set to sea / LCL, 400 sample FBA cartons. Pick a lane and the CBM, cost and container fill update.
CBM Calculator
Rates are example ranges for planning only. LCL is billed on the greater of volume (1 CBM = 1,000 kg) and weight — the W/M rule. Confirm the firm quote with your freight forwarder.
Container counts are theoretical stacking estimates at the load factor above. Real loading usually runs 80–90% after pallets and carton shape. LCL costs are planning estimates only. Confirm both with your freight forwarder before booking.
More CBM Calculator guides
Sources & further reading
Disclaimer
SellHandy isn't a freight forwarder. CBM, W/M and container figures are calculated exactly; the dollar amounts are example 2026 planning bands, not a quote — your forwarder's booking confirmation sets the real number. This tool sizes freight only and doesn't cover Amazon's inbound placement or storage fees.