Amazon Ad Profitability
Live Amazon Ads numbers per ASIN, run through the Shelf Life profitability math: units × (gross unit profit + halo) minus ad spend and the Shelf Life fee. Formats (print / ebook / audio) are derived from each ASIN; fix any wrong guess in a title's ASIN list. Everything you type here is shared with the team.
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How the math works, and how to think about halo
- Gross profit (incl. halo) = Σ over formats of units × (that format's gross unit profit + halo $/unit).
- Total ad spend = Amazon ad spend + the Shelf Life fee for the dates you picked. The contract total is spread evenly over its days: $3,000 from Sep 1 to Dec 31 is about $24.59 a day, roughly $750 a month. Contracts ending within 30 days are flagged.
- Net = gross profit − total ad spend. Net per unit = net ÷ units.
- Units are Amazon's 14-day click-attributed units for the ASINs the ads advertised. Spend and units are taken per ASIN, so a campaign's spend that Amazon doesn't tie to an ASIN (e.g. Sponsored Brands) isn't counted in the table; the "Unattributed" figure in each title's detail shows how much that is.
- Halo ideas (it's editable per title, default $1.00): (1) Amazon's own "other SKU purchases" after an ad click is the most direct measure and would be multiplied by that book's unit profit. The nightly pull isn't capturing it yet. (2) Compare Vendor Central units for the title (shown in each title's detail) with ad-attributed units: if total units run well above ad units, there's organic or halo sales riding along. Compare a month with ads to a quiet month to see the lift. (3) For a title with several formats, an ad on the print ASIN that also sells ebook and audio is halo for those formats, so the split by format makes it visible.