About this video
In this video, we share our views on some of the most common misconceptions about daily budget calculations in amazon advertising and share our experience with each campaign bidding strategy on Amazon.
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Transcript
Frequently asked questions
Why does Amazon sometimes spend more than my daily budget?
Amazon uses a weighted daily budget system, meaning your daily budget is treated as a monthly average rather than a hard daily cap. The actual monthly maximum is calculated by multiplying your daily budget by 30.4, which is the average number of days in a month. On days with higher traffic Amazon can spend up to ten percent above your stated daily budget, making up for slower days earlier in the month where your budget was not fully spent. The total monthly spend will not exceed the monthly average, but individual days can go over your daily number. This is by design and mirrors how platforms like Google have handled budget distribution for years.
What is the difference between dynamic bids down only and dynamic bids up and down?
Both strategies allow Amazon to adjust your bid in real time based on its prediction of whether a click will convert to a sale. Dynamic bids down only gives Amazon permission to lower your bid when it estimates conversion is unlikely, but it cannot raise it above what you set. Dynamic bids up and down gives Amazon permission to both lower and raise your bid, up to double your set bid, when it estimates a conversion is likely. Down only is the more conservative and cost-controlled option. Up and down gives Amazon more influence over your spend and can drive more impressions and conversions, but also more risk of exceeding your expected cost per click.
When should I use dynamic bids and when should I use fixed bids?
Dynamic bids work best on accounts that have enough historical data for Amazon's algorithm to make meaningful predictions, typically products with consistent sales velocity over several weeks or months. Fixed bids are better suited to situations where you need precise control, such as when you are hitting specific ACoS targets, testing a new campaign where you want to isolate performance without bid variability, or running aggressive product targeting campaigns where you want to guarantee a specific bid level. Fixed bids also make it easier to understand what you are actually paying per click, since dynamic strategies can produce average CPCs that are harder to predict.
Can I use placement bid adjustments on top of my bidding strategy?
Yes, and the combination of bidding strategy and placement adjustments affects your maximum possible cost per click significantly. For example, if you set a one dollar bid with a fixed bidding strategy and a ten percent top-of-search placement adjustment, the maximum you would pay for a top-of-search click is one dollar and ten cents. If you use dynamic bids up and down on top of that, Amazon can then raise your already-adjusted bid by up to double, which multiplies quickly. Before setting aggressive placement adjustments alongside dynamic up-and-down bidding, calculate the theoretical maximum CPC to make sure it stays within a range you can afford.
Does a higher bid guarantee better placements?
Not necessarily. Amazon's ad auction takes into account both bid amount and relevance signals, including your listing's conversion rate, click-through rate, and how well your keywords match the search query. A highly relevant product with a strong conversion history can win competitive placements at a lower bid than a less relevant product. This is why listing optimization and account history matter for PPC performance: a well-optimized listing effectively lowers the bid you need to pay to achieve a given placement, which improves profitability over time.
