(cm³) ÷ 5,000.One unit conversion trips sellers up more than any other: a 20 × 15 × 5 cm box is 1,500 cm³, and 1,500 ÷ 5,000 = 0.3 kg. If the physical weight is 0.2 kg, Amazon charges the 0.3 kg billable weight, and that difference can push a package across a fulfillment size band. Always enter both the real weight and the box dimensions — the calculator applies the larger of the two automatically. ⚡ Try this case live
Import threshold worth knowing: consignments valued at AU$1,000 or more can attract customs duty plus 10% GST at the border, on top of your freight. The threshold is based on customs value (sale price minus international freight and insurance), not the customer's total price — and where GST applies, it is charged on the full price the customer pays, including delivery. That is a landed-cost line, not a selling-side fee, but it changes the number you type into the cost field. Small parcels under the threshold typically clear without that extra layer, so splitting or consolidating shipments is a real margin lever for AU sellers. Tax treatment varies by registration status — these figures are illustrative calculations, not tax advice.
| Line item | Amount |
|---|---|
| Referral fee (15%) | AU$4.50 |
| Fulfillment fee (example) | AU$5.00 |
| Advertising (10%) | AU$3.00 |
| Inbound freight | AU$1.50 |
| Item / landed cost | AU$10.00 |
| Total fees + cost | AU$24.00 |
| Net profit | AU$6.00 (20.0%) |
Enter your real Seller Central rates and the calculator re-derives everything, including break-even.
Note what the example does not include: no returns amortization, no storage, no inbound placement fee, and no fuel-style surcharge line. Australian sellers often add those manually — the calculator's hidden-cost section lets you add returns %, storage days and placement cost, then watch the AU$6.00 example shrink to its true number. The break-even price (the price where net profit hits zero) is re-derived on the same inputs, which is the single most useful number when you are deciding whether AU$28 or AU$32 is the right launch price.
The exchange rate cuts the other way too. If the AUD weakens 5% between sourcing and sale, a US$10 landed cost that was AU$15.00 at order time becomes AU$15.75 by launch — the calculator cannot see currency moves, so re-enter the landed cost whenever the rate shifts materially. A one-point exchange swing is a bigger margin change than most packaging tweaks.
Open the calculator in the Australia view with this $30 example →
Pair it with the free Product Sourcing Scorecard and read How to Calculate FBA Profit Margin 2026 for the full formula. The fee families this mirrors are laid out in Amazon FBA Fees 2026: Complete Guide; for a plain walkthrough of the inputs, see How to calculate FBA profit for Australia.
Select the Australia marketplace in the FBA Calcs calculator, enter your referral percentage and fulfillment fee from Seller Central (Australia fees are not auto-loaded), then add price in AUD, landed cost, metric dimensions and ad spend. The tool computes net profit, margin and break-even.
Model in AUD — it is what you are paid and what Australian fees are charged in. Source offshore and the landed cost must be converted at your effective exchange rate plus transfer fees, and re-checked whenever the rate moves more than a few points.
GST is 10% and is collected through registration, not through referral or fulfillment fees, so it never enters the per-unit math. The exception is import GST on shipments valued at AU$1,000 or more (customs value = sale price minus international freight and insurance) — that lands in landed cost, not in the fee lines.
The same families as the US: referral fees by category, fulfillment fees by size tier, storage, returns and inbound/placement costs. Exact amounts are set by Amazon Australia — confirm them in Seller Central and enter them in the calculator's manual fee mode.
The Australia view switches to metric: dimensions in centimetres and weight in kilograms, with prices in AUD. Dimensional weight uses the international divisor (cm³ ÷ 5,000), so a 20×15×5 cm parcel bills at 0.3 kg billable weight even when the scale says less.
The October–December quarter carries peak storage pricing, as in the US, so model the higher rate for holiday inventory. The exception: if your product sells out before November or you keep days in storage under 60, the peak rate never applies to that SKU.