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Key fact: An Amazon ad only pays for itself while cost per click stays below the profit a click has to earn. The number that decides it is not average CPC but your break-even CPC: price × conversion rate × pre-advertising margin. The free CPC calculator turns a target ACoS into a break-even CPC and a maximum bid, then checks the keywords you are actually bidding on against it.
Find what a click actually costs you, what it is allowed to cost, and the bid to set so every click still leaves profit behind. All figures recalculate as you type.
Formulas used: CPC = spend ÷ clicks · break-even CPC = margin/unit × CVR · max CPC = target ACoS × price × CVR · ACoS = CPC ÷ (price × CVR). Margin/unit is price minus product cost, Amazon fees and other per-unit costs, before ad spend.
The same product becomes affordable at a much higher CPC as conversion rate improves. Each bar is the maximum CPC that keeps the ad profit-neutral.
Paste one row per search term or targeting group. CPC, ACoS and the verdict recalculate on every keystroke. The verdict compares each keyword's CPC against your break-even CPC from the first tab.
| Keyword / targeting | Clicks | Spend $ | Orders | Sales $ | CPC | ACoS | Verdict |
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Most sellers over-bid because nobody ever works out the break-even CPC. Share this calculator with your sellers' group, your VA or the agency that manages your ads — it takes one click and it is free to use.
Cost per click = total ad spend divided by the number of clicks, for the same date range and the same campaign. If you spent $420 and got 300 clicks, your average CPC is $1.40. Amazon reports both figures in the campaign manager, so the calculation is mainly useful for tracking blended CPC across campaigns or marketplaces.
Break-even CPC = contribution margin per unit × conversion rate. If you clear $12 of margin per unit and 1 in 10 clicks converts, your break-even CPC is $1.20. Pay exactly that and advertising adds nothing to profit; pay less and each sale generates profit; pay more and you are subsidising the sale from your own margin.
There is no universal “good” CPC, because a CPC is only good relative to what a click earns you. A $3.50 CPC is excellent for a $180 product converting at 12% and ruinous for a $15 product converting at 4%. Compare your CPC against the break-even CPC this calculator produces, not against a generic benchmark.
Amazon runs a first-price auction on most Sponsored Products placements, so the CPC you pay can sit at or just below your bid rather than being decided by a second-place competitor plus one cent. That is why bid discipline matters more on Amazon than on Google: cutting a bid is usually the only lever that immediately cuts your CPC.
CPC is the cost of a single click. ACoS is ad spend as a percentage of ad-attributed sales. They are linked by conversion rate: ACoS = CPC ÷ (price × conversion rate). Two sellers can pay the same CPC and have very different ACoS if their conversion rates or prices differ.
Lower bids on keywords whose CPC has climbed past their break-even figure, move converting search terms to exact match, add negatives for high-click zero-order terms, shift budget into placements with a lower cost per acquisition, and improve main image, price and review count so the same click converts more often. Raising conversion rate raises your break-even CPC more reliably than any bid trick.
Sponsored Products, Sponsored Brands and Sponsored Display are all billed per click. Sponsored Brands video and some Display placements can also be bought on a cost-per-thousand-impressions basis, in which case cost per click is a derived metric rather than the amount you were billed. Check the billing model before comparing CPCs across ad types.
As an Amazon Associate I earn from qualifying purchases. ylishi.tools is not endorsed by or sponsored by Amazon; fees, ad rates and auction behaviour are set by Amazon and change without notice.
CPC, break-even CPC and the bid to set - in under 3 minutes.