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Amazon profit, ROI and break-even calculator

Enter your price, product cost and fee assumptions to estimate contribution profit, margin, ROI and the price you break even at. Every number below is one you control, this does not look up Amazon's live fees, and it never asks who you are.

Got a selling price but no deal yet? Switch to Most I can pay and it works out the highest supplier cost that still makes the return you want.

Want the fees looked up for a real product? Use the free FBA calculator with any ASIN.

Your assumptions

$What the listing sells for
$What you pay your supplier per unit
%Varies by category, commonly 8 to 15 percent. See Amazon's referral fee table
$FBA fee per unit, from Seller Central or the FBA calculator
$Prep, inbound shipping, anything else

Contribution profit

$8.50

Per unit, after the fees and costs you entered.

Contribution margin

28.33%

Profit as a share of the selling price.

Cost-based ROI

50.00%

Profit divided by product + fulfillment + other costs. ROI conventions differ; this is the denominator used here.

Break-even price

$20.00

The selling price at which contribution profit reaches zero.

The formulas, in full

  • profit = price × (1 − referral) − cost − fulfillment − other
  • margin = profit ÷ price
  • ROI = profit ÷ (cost + fulfillment + other)
  • break-even = (cost + fulfillment + other) ÷ (1 − referral)

What this leaves out

These are not live Amazon fees. The model counts only what you type: the selling price, product cost, a referral percentage, the FBA fulfillment fee and other per-unit costs, which is where prep and shipping to Amazon go. It applies the referral percentage to the whole price, so it omits category minimum fees, inbound placement fees, tiered fees, returns, storage, advertising, taxes and business overhead unless you fold them into “other per-unit costs”. A positive contribution profit does not mean the business is profitable. Check the current applicable fees before you buy.

New to these fees? Amazon FBA fees explained walks through each one with worked examples.

Stop typing the assumptions in

Inside Apex these numbers come from your own account. Your landed costs, your prep and shipping, the fees on your real listings, and they run across a whole supplier catalog instead of one product at a time.

Track these numbers in Apex

See Apex Blue for connected profit reporting, Apex Green for catalog analysis, or what a plan costs.

Working through a supplier's list by hand first? Here is how to analyze a wholesale price list.

Questions people ask about this

Are these live Amazon fees?

No. This version calculates from the assumptions you enter. Check the current applicable fees for your category and product size before buying.

Does positive contribution mean my business is profitable?

No. Contribution profit is per unit and before the costs of running a business. Include overhead, returns, taxes, advertising and storage in your wider analysis.

How does “Most I can pay” work it out?

It starts from what is left of the selling price after the referral fee and divides that by one plus your target ROI. That is the most a unit can cost you in total. Take off the fulfillment fee and other per-unit costs, and what remains is the most you can pay the supplier. Type that figure into “Profit at my cost” and the ROI comes out at your target, because both modes use the same ROI.

Why is my ROI different elsewhere?

ROI conventions differ. This divides profit by product cost plus fulfillment plus other per-unit costs, and the denominator is printed beside the figure so you can compare like with like. The free FBA calculator leaves Amazon's fees out of its denominator and divides by your own costs only, so the two tools can show a different ROI for the same product.

Guides for your numbers