Your Amazon bid is not what you pay per click
Most sellers set a bid and treat it as the most a click can cost. On Amazon that is only true with some campaign settings. We compared the bid of each keyword with what its clicks actually cost on real accounts. With one common setting, the average click cost 1.4 times the bid.
The measured numbers below come from real accounts: 9 advertiser accounts in Europe, the UK and the US, 10 account and currency pairs, Sponsored Products keywords, day by day from September 3 to October 3, 2026. We started on September 3 because that is the first day we have each campaign's bidding strategy and placement adjustments recorded. We stopped on October 3 so that the ad-attributed sales of the last days are close to final. We counted every keyword day with at least one click: 1,394 keyword days, 3,400 clicks, 93 campaigns. For each one we divided the average cost of a click by the keyword's bid. Below, "account" means one account in one currency.
What Amazon does with your bid
Each Sponsored Products campaign has one of three bidding strategies, and Amazon describes them like this:
- Dynamic bids, down only: Amazon may lower your bid when a click is less likely to lead to a sale.
- Dynamic bids, up and down: Amazon may raise your bid by up to 100% for the top of the first search results page, and by up to 50% for other placements. It may also lower it.
- Fixed bids: Amazon uses your bid as it is.
On top of that, the campaign can have placement adjustments, for example +50% for the top of search. These multiply the bid, with any of the three strategies.
What the clicks cost
Across all keyword days, a click cost 1.17 times the bid on average, weighted by clicks. On 40.7% of the keyword days the average click cost more than the bid, on 34.7% less, and on the remaining quarter exactly the bid.
The strategy made the difference:
- Down only (63 campaigns, 1,782 clicks): 1.00 times the bid on average. The click cost more than the bid on 18.4% of keyword days. Without any placement adjustment that happened on 5.1% of days, with one on 25.0%.
- Up and down (33 campaigns, 1,531 clicks): 1.40 times the bid on average. The click cost more than the bid on 76.4% of keyword days. On 1 in 10 keyword days it cost more than 2.23 times, and the highest day was 3.75 times.
- Fixed (3 campaigns, 87 clicks): 0.83 times the bid. That is too few clicks to say anything general.
A few campaigns changed strategy during the month, so they appear in two groups.
So a 0.70 euro bid in an up and down campaign meant an average click of about 0.98 euro, and on 1 in 10 days more than 1.56 euro.
More expensive clicks are not automatically worse
7 accounts ran keywords under both down only and up and down. In all 7, clicks under up and down cost more, both compared with the bid and in money.
That does not make them bad clicks. In 3 of the 7 accounts both groups had at least 5 orders, and in all 3 the up and down keywords sold at a lower ACOS: 24.2% against 33.0%, 44.2% against 67.1%, and 58.0% against 61.1%. In the other 4 accounts the up and down keywords had 0 to 2 orders in the month, which is too few to judge.
This is not a test. The two groups are different keywords in different campaigns, so the better ACOS may come from the keywords and not from the strategy. What the numbers do show is that a high cost per click on its own tells you nothing. The question is whether the sales pay for it.
What we could not see
The report shows one bid per keyword per day. If you changed a bid during the day, the comparison for that day is off, which may explain part of the 5.1% of down only days without placement adjustments that still paid more than the bid. We did not see which placement each click came from at keyword level, so we cannot split the extra cost between the dynamic raise and the placement adjustment. The 5-order cut-off is our choice, not a measurement. And the report counts purchases for 7 days after the click.
Set your bid in 20 minutes
- Work out the most a click can cost you: price times conversion rate times your target ACOS. For example, a 20 euro product with 5% conversion and a 30% target ACOS gives 0.30 euro per click. This is an example, not a measurement.
- Download the Sponsored Products targeting report by day for the last 4 weeks, ending at least a week ago, with bid, clicks and spend for each keyword.
- Next to each keyword write the average cost per click (spend divided by clicks) and the campaign's bidding strategy and placement adjustments.
- Compare the cost per click, not the bid, with the number from step 1.
- In an up and down campaign, the top of search ceiling is the bid times 2, times the placement adjustment: a 0.30 bid with +50% can reach 0.90. If that campaign sells at your target ACOS, leave it. If it does not, switch it to down only or lower the placement adjustment before you cut the bid.
- After 2 weeks, compare the changed campaigns with the 2 weeks before: did the cost per click move, and did ACOS follow?
Your bid is the starting point of the price, not its limit. The setting next to it decides how far the price can go.