Tracking ROAS, ACoS, and Wasted Spend for Prime Day
← Back to Amazon Ads Schedule Bid Rules Around Prime Day: What to Monitor
Quick answer
Amazon Ads Prime Day bid rule monitoring depends on a focused set of performance signals: spend, sales, ROAS, ACoS, CPC, CTR, conversion rate, and wasted ad spend. These metrics show whether scheduled bid rules are protecting margin or allowing budget to leak into low-intent searches. Tracking them consistently before and during Prime Day gives sellers a clear view of what to adjust, pause, or leave unchanged.
Amazon bid rules can shift quickly during Prime Day, so early monitoring around ROAS and ACoS is often more practical than waiting for a complete sales report. A simple daily routine can reveal where spend is rising without enough return.
Core metrics to monitor
For Prime Day bid rules, the most useful dashboard starts with spend, sales, ROAS, ACoS, CPC, CTR, conversion rate, and wasted ad spend. Each metric adds context: spend shows volume, sales shows output, and wasted ad spend flags spend that missed your targets.
Teams that manage multiple accounts often use an Amazon Ads Dashboard to bring these numbers into one place instead of sorting through separate reports.
- ROAS — sales generated for each dollar of ad spend
- ACoS — ad spend as a percentage of sales
- CPC and CTR — early signals of competition and relevance
- Conversion rate — how well clicks turn into purchases
Reading ROAS and ACoS together
ROAS and ACoS are inverse views of efficiency. A high ROAS usually means more revenue per ad dollar, while a low ACoS means ad cost is a smaller share of sales. During Prime Day, both can move quickly as clicks get more expensive.
Rather than waiting for a campaign to fully run its course, check whether ACoS is climbing while ROAS slips. That combination often points to bid rules pushing spend toward terms that are not converting at the same rate as the rest of the account.
When this matters: daily checkpoints
Daily monitoring is most useful in the 48 hours before Prime Day begins and during the event itself. If you only review metrics weekly, a scheduled bid increase can run for several days before you notice it is driving unprofitable clicks.
At a minimum, compare today's spend, ACoS, and wasted ad spend against the same point in the previous day. Flag any jump that cannot be explained by higher sales volume alone.
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Related guides
Tracking these metrics gives you a clear baseline before you adjust scheduled bid rules for Prime Day. For a wider view of how to schedule and monitor those changes, revisit the main Amazon Ads bid rules guide to see how these signals fit into your overall Prime Day workflow.