Amazon PPC Optimization: How to Lower ACOS Step by Step

Campaign structure that scales without chaos

Most accounts we audit have one problem in common: campaigns that try to do everything. A single Sponsored Products campaign with 80 keywords across three match types, targeting both branded and non-branded terms. That structure makes it impossible to control budgets, read data cleanly, or make confident bid decisions.

Here is the framework that works at scale:

• Single-keyword exact campaigns: one keyword per ad group for your top 10-15 revenue-driving terms. This gives you total bid and budget control on the terms that matter most.
• Tiered research campaigns: broad and phrase match campaigns organized by theme (competitor, category, long-tail) that feed converting search terms into your exact campaigns.
• Auto campaigns by ASIN: one auto campaign per parent ASIN, with all four targeting groups active. These are your discovery engines.
• Branded defense campaigns: exact match on your brand name and product names, isolated from everything else. These should run at 5-10% ACOS consistently.

Why isolate branded terms? Because mixing branded and non-branded traffic in one campaign inflates your apparent performance. You think you are running at 18% ACOS, but your branded terms are at 4% and your non-branded terms are at 38%. You cannot fix what you cannot see.

Sponsored Brands and Sponsored Display campaigns follow a similar logic. Separate them by objective: brand defense, category conquest, retargeting. If you are running Sponsored Brands Video, give each creative its own campaign so you can read creative performance without confounding variables. Need help with the listing those ads point to? Strong conversion rate optimization on the detail page is what turns clicks into orders.

Search term harvesting and the negative keyword engine

Search term reports are where money is found and where money is saved. The process is simple in concept, tedious in practice, and skipped by most sellers after the first month.

Harvesting winners

Pull your search term report weekly. Filter for search terms with at least 2 conversions and an ACOS below your target. These terms graduate from your broad or phrase research campaigns into single-keyword exact campaigns with their own bids. Then add the term as a negative exact in the source campaign so you stop paying broad-match CPCs for a term you now control precisely.

This sounds obvious. But in practice, most accounts have hundreds of converting search terms still running in auto or broad campaigns at inflated CPCs because nobody moved them.

Negative keywords: where the real savings hide

Every week, filter your search term report for terms with 15+ clicks and zero conversions. Add them as negative exact to the offending campaign. For terms that are clearly irrelevant categories (a supplement brand showing up for "dog vitamins"), add them as negative phrase so you block the entire cluster.

Build a master negative keyword list at the account level and apply it across all non-branded campaigns. This list grows every week. After 3-4 months of consistent negative keyword work, you will see your ACOS drop by 3-8 percentage points from this discipline alone. Amazon keyword research feeds both your organic SEO and your paid search term strategy; the two should work together.

Bid and placement adjustments that actually move the needle

Amazon gives you three placement buckets: top of search, rest of search, and product pages. Most operators set a base bid and leave placement modifiers at 0%. That is leaving performance on the table.

Here is how to think about it. Top-of-search placements typically convert at 2-3x the rate of rest-of-search or product page placements, according to data from Jungle Scout and internal Hyperzon campaign data. But they also cost more per click. The math: if your base bid is $1.50 and top-of-search converts at 15% compared to 6% for other placements, you can afford to bid $1.50 x 2.5 = $3.75 for top-of-search and still hit a lower ACOS.

Set your base bid for the lowest-performing placement (usually product pages), then use placement multipliers to push top-of-search bids up by 50-200%. This keeps your product page and rest-of-search spend efficient while competing aggressively where it pays off.

Re-evaluate placement modifiers every two weeks. Pull the placement report, calculate ACOS by placement for each campaign, and adjust. If top-of-search ACOS is creeping above target, pull the modifier back 10-20%. If product page ACOS is profitable, raise the base bid slightly rather than adding a product page modifier (Amazon applies modifiers multiplicatively, which can create bid spikes).

One thing sellers miss: the "adjust bids by placement" setting only works when you select "fixed bids" or "down only" as your campaign bidding strategy. If you are on "up and down," Amazon's algorithm is already adjusting bids and your placement modifiers interact unpredictably with that algorithm. Pick "down only" for mature campaigns and "fixed bids" when you want total control.

Does dayparting actually work on Amazon?

Yes, but not the way most sellers implement it.

Amazon does not offer native dayparting in Seller Central's ad console. You need a third-party tool (Perpetua, Pacvue, Quartile, or a custom script via the Amazon Ads API) to schedule bid changes by hour. The question is whether the effort is worth it.

Pull your hourly performance data from the Campaign Manager (or via the API) and look at two metrics by hour: conversion rate and CPC. In most categories, we see conversion rates dip between 1 AM and 6 AM local time while CPCs stay relatively flat, because auto-bidding competitors keep spending through the night. That means your ACOS is worst during those hours.

The operator move is to reduce bids by 30-50% during low-conversion windows and reallocate that budget to peak hours (typically 8-11 AM and 7-10 PM). For a brand spending $3,000/day on PPC, shifting 15% of daily spend from dead hours to peak hours can lower blended ACOS by 2-4 points.

A word of caution: dayparting only matters once you have fixed your structure, negatives, and bids. It is a refinement, not a rescue. If your campaigns are structurally broken, dayparting is rearranging deck chairs.

Match type strategy: broad, phrase, exact, and when to use each

Match types are tools with specific jobs. Treating them interchangeably is why campaigns bloat.

• Broad match: discovery. Use it to find search terms you did not know existed. Bid conservatively (40-60% of your target exact-match bid). Accept higher ACOS here because the goal is data collection, not immediate profitability.
• Phrase match: semi-targeted discovery. Useful for long-tail clusters where word order matters ("organic protein powder" vs. "powder protein organic"). Bid at 60-80% of your exact-match bid.
• Exact match: performance. Your best keywords live here with aggressive bids and tight ACOS targets. This is where most of your budget should end up over time.

The ratio shifts as a product matures. During a product launch, you might allocate 40% of spend to broad and phrase for discovery. After 3-4 months, a well-optimized account runs 60-70% of spend through exact match campaigns because you have already identified what works.

One pattern we see repeatedly: sellers keep broad match campaigns running at the same bids indefinitely, even after they have harvested every useful term. Those campaigns become ACOS anchors. Once a broad campaign's search term report stops producing new converting terms for two consecutive weeks, cut its budget by half or pause it entirely.

The weekly optimization routine

Consistency beats intensity. A disciplined 90-minute weekly review will outperform a frantic 8-hour monthly overhaul every time. Here is the cadence:

1. Pull reports (15 min): download search term, placement, and campaign performance reports for the trailing 7 days. Compare against the trailing 30 days for context.
2. Negative keyword pass (20 min): filter for search terms with 15+ clicks and 0 orders. Add negatives. Flag borderline terms (8-14 clicks, 0 orders) for review next week.
3. Harvest converting terms (15 min): move winners from broad/phrase/auto into exact campaigns. Add negative exact in the source campaign.
4. Bid adjustments (20 min): raise bids 10-15% on keywords with ACOS below target that have room to scale (impression share below 10%). Lower bids 10-20% on keywords with ACOS above target for two consecutive weeks. Adjust placement modifiers.
5. Budget reallocation (10 min): shift daily budget from underperforming campaigns to campaigns that are budget-capped and profitable. Kill campaigns with zero conversions in the last 14 days.
6. Log changes (10 min): record every change in a spreadsheet or tool changelog. This is the part most people skip, and it is the part that lets you learn from your own data over time.

Do this 12 weeks in a row and your account will look fundamentally different. The search term report gets cleaner. The negative keyword list gets longer. The exact match campaigns get more of the budget. ACOS trends down. Want to understand how PPC profitability connects to your broader margin structure? Our breakdown of judging ads by profit covers the financial framework behind every bid decision.

Where most brands stall

The techniques above are straightforward. Execution is the bottleneck. We see brands stall for three predictable reasons: they do not run the weekly routine consistently, they react to daily fluctuations instead of weekly trends, or they optimize PPC in isolation from listing quality. A campaign with a 2% conversion rate on the detail page will always have a high ACOS, no matter how good your bids are. Fixing the listing fixes the math.

The brands that push from 30% ACOS to sub-20% treat PPC as a system, not a set of individual campaigns. Structure feeds data. Data feeds decisions. Decisions compound over weeks. There are no shortcuts, and there are no secrets. There is only the work.

If your Amazon PPC spend keeps climbing without a proportional increase in profitable revenue, the structure is the problem. Hyperzon's PPC team builds and manages campaign architectures that lower ACOS while scaling ad-attributed sales. Get a free Amazon audit.

Article was originally published on 11 October, 2026