Amazon glossary
What is CPC?
CPC — Cost Per Click.
By AIAdKing Editorial Team · Reviewed
- CPC — Cost Per Click
- CPC (Cost Per Click) is what you actually paid for a click — usually less than your bid, since Amazon charges just enough to win the auction. Average CPC tells you how expensive a keyword or category is to advertise in.
In depth
Your bid is the most you are willing to pay; CPC is what you really paid, and on Amazon’s second-price-style auction it usually lands below your ceiling. That makes CPC a market thermometer: rising CPCs in a niche mean more competition for the same clicks, and margin that used to be yours being bid away. The profitability check is CPC against conversion rate — cost per order is CPC ÷ conversion rate, so a rising CPC with flat conversion mechanically inflates ACoS even though "nothing changed" in your account. When that happens the moves are: re-justify the bid downward, improve the listing so conversion absorbs the pricier click (the listing optimization guide covers the levers), or shift budget to terms and placements where the auction is still cheap. Watching average CPC per keyword over time is one of the simplest early-warning systems in PPC management.
Formula
CPC = Total Spend ÷ Clicks (the auction charges just above the next-highest bid)
Worked example
You bid $1.00 on "insulated lunch bag". The next-highest competing bid is $0.62, so Amazon charges about $0.63 per click. Over a week: 210 clicks, $132.30 spend, average CPC $0.63 — 37% below your ceiling. Then two new competitors enter and average CPC climbs to $0.85. Your conversion rate is unchanged at 8%, so cost per order rises from $7.88 to $10.63; on a $24.99 product that pushes ACoS from about 32% to about 43%. Nothing about your listing changed — the auction got more expensive, and the bid needs re-justifying.
When to use it
Check CPC trends monthly per category, and whenever ACoS drifts up without a conversion change. Use it when sizing new keywords too: Amazon's suggested-bid range previews how expensive a niche's auction has become before you commit budget.
Common mistakes
- Confusing bid with CPC — "my CPC equals my bid" usually means the auction is competitive right up to your ceiling, which is itself a signal.
- Reacting to CPC alone — a more expensive click that converts twice as well is a better buy; cost per order is the number that decides.
- Ignoring slow CPC inflation — a few cents a month compounds into a structurally different ACoS by year-end while nobody notices.
How AIAdKing handles CPC
AIAdKing factors real CPC and conversion data into every bid decision, so it backs off keywords whose click cost has outrun their sales.
CPC — quick answers
What is CPC?
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