The Bid Stack Calculator
How it works
Three layers, multiplied: your base bid, your placement boost (up to +900%), and dynamic bidding. On “up and down”, Amazon can raise the bid again by up to 100% on top of search and up to 50% everywhere else. So a $1 bid with a 50% top-of-search boost can cost $3 there.
What a click can cost you
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| Placement | Base | Boost | Dynamic | Max per click |
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Price each placement off its own conversion rate
From your placement report. Your base bid is priced for the weakest placement; the others earn a boost in proportion.EXAMPLE
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| Placement | Conversion | Worth | Boost it earns |
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How to use it
- Put in your base bid and the placement boosts from the campaign’s settings.
- Pick your dynamic bidding setting. The last column is the most a click can cost on each placement.
- Pull your placement report and put in each placement’s conversion rate.
- Set each boost to what that placement earns, not to the maximum.
- With a big boost, set dynamic bids to “down only”, so Amazon can’t double it again.
Good to know
- Example: top of search converts at 12% and product pages at 4%. A top-of-search click is worth 3× as much, so it earns a +200% boost, not +900%.
- You pay the auction price, which is at or under these maximums.
- Amazon’s limits as of October 2026: placement boosts up to 900%; “up and down” raises bids up to 100% on top of search and up to 50% on other placements. Check the current Amazon Ads help pages if in doubt.
Dr. PPC checks every placement against your goal, and when top of search overpays, it proposes the cut for your approval.
Start for $1