Check one product before you buy the inventory

The referral fee is 15% in most categories and is charged on the total sales price - item price plus shipping and gift wrap, not the item price alone. At the shipped defaults this puts a $24.99 unit at $6.22 net after fees, ads and refunds, a 92.1% ROI and a $16.51 floor price.

Your selling price (list price) USD Supplier cost per unit USD Inbound freight + duty per unit USD Prep, labels and polybag per unit USD Referral fee (15% in most categories, on the total sales price) % FBA fulfilment fee per unit (paste from your fee preview; the default is only a placeholder) USD Storage + placement per unit (from your storage-fee report; the default is only a placeholder) USD Unsellable returns, share of units sold % Ad spend as a share of sales % Referral fee comes back on a refund (check your settlement report)

Landed cost per unit (cost + freight + prep)	—	USD
Marketplace fees per unit (referral + fulfilment + storage)	—	USD
Payout per unit after marketplace fees, before your costs	—	USD
Ad spend per unit sold	—	USD
Refund cost per unit sold (revenue given back, net of any referral credit)	—	USD
Net profit per unit	—	USD
Net margin	—	%
ROI on cash (profit / landed cost)	—	%
Break-even sale price (0 = unreachable at these percentages)	—	USD
Break-even ad spend (ACOS ceiling)	—	%

Landed cost to net profit, line by line
Ten outputs from your ten numbers: landed cost, marketplace fees, payout, ad spend, refund cost, net profit, margin and ROI on cash. The parts add back up to the profit figure, so you can audit it against your settlement report.

Break-even price solver
Solves the lowest price that still returns zero, instead of cost / (1 - margin). The referral fee and the ad spend shrink as the price falls, so the hand method sets the floor too high and rejects products that would have worked.

Break-even ad spend (ACOS ceiling)
The highest share of sales you can pay for ads before this unit stops making money - the number to compare your actual ACOS against, computed after marketplace fees, landed cost and refunds, not before them.

No fee is hard-coded
Every marketplace fee is a field you paste from your own fee preview and storage-fee report. Those are re-priced at least yearly, so nothing here goes stale; when they change you change one field, and any updated file stays free from the same listing.

Assumptions stated, not asserted
The refund model is written down: the fulfilment fee is treated as spent, the returned unit as unsellable, and you tick whether the referral fee comes back. An independent tool - no logos, no affiliation, and no access to your seller account.

Offline install, no account
Not a store install: open chrome://extensions, switch on Developer mode, click Load unpacked and pick the folder. Edge and Brave work the same way, and menu wording varies by version and interface language. Works offline, no login. 7-day full refund; questions to the email on the listing.

Get the complete version $60

This page is the working piece. The full pack has everything below.

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