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Amazon FBA & FBM revenue calculator

Profit, ROI, margin, break-even price and the most you can pay per unit — both fulfilment lanes side by side, with the FBM label priced from a published USPS Ground Advantage table instead of typed in from memory, and dated on the page so you know how far behind it runs.

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The numbers you type. Amazon's referral and FBA fees are input fields showing their default, not a silent 15% — and every figure is worked out in your browser, so nothing is sent anywhere.

The unit
$
$

What the supplier charges you for one unit.

%

Used for the “most you can pay” figure below.

What Amazon takes
%
$

15% and $3.50 are starting values, not your item's fees. Amazon's referral rate depends on the category and the FBA fee depends on size tier and weight — neither can be worked out from a price and a box. Overwrite them with the exact figures from your Seller Central listing, or connect your Amazon account and FlipIQ Batch pulls both from the SP-API for every ASIN in a supplier list. Connect an Amazon account →

What you pay
$

Per unit. Charged on both lanes.

$

Per unit, FBA only — getting the box to the warehouse.

FBM shipping — the label you buy
in
in
in

The box is optional. Dimensional weight only applies above 1,728 cubic inches (one cubic foot); under that, USPS bills the actual weight and the measurements change nothing.

$6.75USPS Ground Advantage Commercial

Actual weight 1.50 lb. Billable weight 1.50 lb — the box never beats the scale here, so you pay for what it weighs. USPS charges by the next whole pound, so this lands in the 2 lb band.

Pre-July-2026 rates. USPS raised Ground Advantage Commercial by about 11.8% on 12 July 2026 and this table is older than that, so this figure reads low. Price the real label at usps.com before you commit to an order.

$

Leave empty to use the rate above. A negotiated carrier account beats any published table.

FBA

Amazon picks, packs and ships it

Net profit per unit$8.3929.99 − 4.4985 − 3.5 − 0.6 − 0.5 − 12.5 = 8.3915
ROI61.7%8.3915 ÷ 13.6
Margin28.0%8.3915 ÷ 29.99
Break-even price$20.12(3.5 + 0.6 + 0.5 + 12.5) ÷ (1 − 0.15)Sell below this and the unit loses money, however fast it moves.
Most you can pay, at 30.0% ROI$15.82(29.99 − 4.4985 − 3.5 − 0.6 − 0.5×1.3 − 0.3×0.6) ÷ 1.3The number to take back to the supplier's price list.
Sale price
$29.99
Referral (15%)
−$4.50
FBA fulfilment fee
−$3.50
Inbound to Amazon
−$0.60
Prep / labelling
−$0.50
Unit cost
−$12.50
Net profit
$8.39
Capital per unit (cost + prep + inbound)
$13.60

FBM

You ship it yourself

Net profit per unit$5.7429.99 − 4.4985 − 6.75 − 0.5 − 12.5 = 5.7415
ROI44.2%5.7415 ÷ 13
Margin19.1%5.7415 ÷ 29.99
Break-even price$23.24(6.75 + 0.5 + 12.5) ÷ (1 − 0.15)Sell below this and the unit loses money, however fast it moves.
Most you can pay, at 30.0% ROI$13.92(29.99 − 4.4985 − 6.75 − 0.5×1.3) ÷ 1.3The number to take back to the supplier's price list.
Sale price
$29.99
Referral (15%)
−$4.50
USPS Ground Advantage label
−$6.75
Prep / labelling
−$0.50
Unit cost
−$12.50
Net profit
$5.74
Capital per unit (cost + prep)
$13.00

The label above is priced from a pre-July-2026 USPS table. Ground Advantage went up about 11.8% on 12 July, so this profit is optimistic by roughly that much of the label.

The label is not capital: you buy it when the order comes in, out of the sale itself. That is why the same profit gives a higher ROI here than the dollars alone suggest — and it is the same convention Amazon's own settlement uses.

What is not in these numbers

Monthly and long-term storage, the inbound placement fee, returns and their processing fee, advertising, refund administration and sales tax. And the question that decides whether any of this matters at all: whether your account is allowed to sell that ASIN. Those are per account, per ASIN and per month — none of them can be derived from a price and a weight, which is why this page does not pretend to.

The shipping rate is out of date, and here is exactly how

The FBM label comes from the USPS Ground Advantage Commercial bands built into FlipIQ Batch's own pricing engine: thirteen per-pound bands across three zone groups, four sub-pound bands, billable weight capped at 70 lb, and dimensional weight only above 1,728 cubic inches. That table was checked on 27 August 2026 and it is the same one the product runs on.

It predates the July 2026 price change, so every FBM label on this page reads low. Not only on big boxes, and not by a rounding error. On 12 July 2026 USPS changed four things at once, and this page reflects none of them:

  1. Prices went up about 11.8% on average. This is the one that matters most and the one that was missing from this page until 27 August 2026. It touches every package at every weight, so there is no box small enough to escape it. Read the FBM lane knowing the label is roughly a tenth cheaper here than at the counter.
  2. The 4 oz and 8 oz bands no longer exist. USPS eliminated ounce-based rate differentiation for published commercial prices and now bills every sub-pound package at the 12–15.99 oz rate. This page still has four sub-pound bands, so anything under 12 oz is priced from a band that was retired.
  3. The dimensional divisor went from 166 to 139. Above one cubic foot that raises billable weight by about 19% on the same box. This page still divides by 166.
  4. Every dimension is rounded up to the next whole inch before that divisor is applied. This page takes your inches as typed.

So the honest version of what this calculator does for FBM: it prices the label from a published table USPS has since replaced, and the error runs in the direction that flatters the row. A margin that survives here can fail on a real label — which, on a page whose whole argument is that it prices the shipping instead of guessing it, is worth saying twice. Price the actual box at usps.com before you commit to an order, or type the figure into “use your own label price” above and the whole FBM lane recalculates on it.

Sources: USPS newsroom, 11 May 2026 (announces the 12 July date and the end of ounce-based commercial rates) · USPS, 2026 postage price change · TransImpact, the 11.8% average and the 139 divisor. All three read on 27 August 2026.

Everything above is arithmetic on what you typed. Nothing on this page contacts Amazon, Keepa or any other service — open your browser's network tab and watch it stay empty while you type.

How it is calculated

profit = sale − (sale × referral%) − fulfilment − prep − shipping − cost

sale
the price the unit sells for on Amazon, before anything is deducted
referral%
Amazon's commission on the sale price. It depends on the category — 15% is the most common band and the value this page starts with, but it is a field you can overwrite with the figure from your own Seller Central
fulfilment
who moves the box. On FBA it is Amazon's fulfilment fee, which depends on size tier and weight ($3.50 is the starting value, not a reading of your ASIN). On FBM it is the carrier label, and that one this page works out for you from weight, box and zone
prep
polybag, label, bundling — whatever you or your prep centre charge per unit. Paid on both lanes
shipping
on FBA, what it costs you to get one unit into Amazon's warehouse. On FBM there is no separate term: the label is already the fulfilment cost
cost
the supplier's price for one unit — the number on the price list
break-even price
the sale price at which profit is exactly zero, everything else held: (fulfilment + prep + shipping + cost) ÷ (1 − referral%). Below it the unit loses money no matter how fast it sells
max cost
the inverse question, and the one you actually have in front of a supplier list: the most you can pay per unit and still hit a target ROI. (sale − referral − fulfilment − shipping − prep×(1+target) − target×shipping) ÷ (1 + target)

Worked example

  1. The page opens on this unit: it sells for $29.99, the supplier charges $12.50, it weighs 1.5 lb in a 9 × 6 × 3 in box, referral 15%, FBA fee $3.50, prep $0.50, inbound $0.60 per unit, target ROI 30%.
  2. Referral: 29.99 × 0.15 = $4.4985. The panel shows $4.50; the arithmetic keeps every decimal, which is why the totals below are a cent off what you get adding up the rounded figures by hand.
  3. FBA profit: 29.99 − 4.4985 − 3.50 (FBA fee) − 0.60 (inbound) − 0.50 (prep) − 12.50 (cost) = $8.39.
  4. FBA ROI: the money that leaves your pocket before Amazon pays out is 12.50 + 0.50 + 0.60 = $13.60, so ROI = 8.3915 ÷ 13.60 = 61.7%. Margin = 8.3915 ÷ 29.99 = 28.0%.
  5. FBM label: 1.5 lb rounds up to the 2 lb band, and the USPS Ground Advantage Commercial table this page runs on prices that band at $6.75 in zones 5-6. That table is older than the 12 July 2026 price change, which raised Ground Advantage by about 11.8% on average, so the label you would actually buy today costs more — the page says so next to the figure. The box is 9 × 6 × 3 = 162 cubic inches, well under the 1,728 threshold, so dimensional weight never enters this one.
  6. FBM profit: 29.99 − 4.4985 − 6.75 (the label) − 0.50 (prep) − 12.50 (cost) = $5.74. Capital is 12.50 + 0.50 = $13.00 — the label is bought when the order comes in, out of the sale itself — so ROI = 5.7415 ÷ 13.00 = 44.2%.
  7. Break-even on FBA: (3.50 + 0.60 + 0.50 + 12.50) ÷ (1 − 0.15) = 17.10 ÷ 0.85 = $20.12.
  8. Break-even on FBM: (6.75 + 0.50 + 12.50) ÷ 0.85 = 19.75 ÷ 0.85 = $23.24. The self-shipped lane needs $3.12 more on the shelf just to survive, which is the whole FBA-versus-FBM argument in one number.
  9. Max cost at 30% ROI on FBA: (29.99 − 4.4985 − 3.50 − 0.60 − 0.50×1.30 − 0.30×0.60) ÷ 1.30 = 20.5615 ÷ 1.30 = $15.82. On FBM the same sum gives $13.92. That is the figure to take back to the price list: pay a cent more and the 30% is gone.

One unit is arithmetic. The price list is the job.

This page prices one unit with the fees you typed. FlipIQ Batch connects to your Amazon account read-only over the official SP-API, pulls the FBA and FBM fees Amazon charges you for each ASIN, checks whether your account may sell that item at all — restrictions are per account, not generic — and runs the whole supplier list as it arrived: Excel, CSV, or the 300-page distributor PDF. 5,000 rows a month free, no card.

Run a supplier list free

More free tools: UPC & EAN check digit calculator · The seven Amazon restriction types. Read alongside them: Amazon wholesale suppliers, and how to read their price list · What the numbers on a supplier row mean. Or see the three places to ask the engine and the rest of the free tools.