Unique Reach

Author: Kadence Leung 

Last Update：2026/04/12

 

Introduction

Standard ad reports tell you how many total impressions you generated, but they can't answer the most important question: Are you reaching 1,000 different people, or just hitting the same person 1,000 times?

The Unique Reach model cleans up your data by counting each person only once (deduplication). It shows you the actual size of the audience your ads reached, how that audience grows over time, and how efficiently your budget is finding "New-to-Reach" shoppers.

Use this data to answer:

• Am I actually expanding my brand’s footprint, or just repeatedly hitting the same small group of shoppers?

• What is my true "Cost per New Reached Shopper"?

• Which campaigns are my best engines for finding new people vs. just retargeting old ones?

• Have I hit a "saturation point" where spending more money isn't bringing in any new people?

 

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When to Use This Report

This model is essential for brand managers, media buyers, and strategists focused on scaling market share rather than just harvesting existing demand. You should leverage this model if your goals include:

• • Validating Product Launches: In the first 4–8 weeks of a launch, prove that your media plan is generating broad, unduplicated awareness.

  • Justifying Budget Reallocations: Before shifting budget from Sponsored Products (SP) to DSP, prove that DSP delivers a high volume of New Reach UV at a lower cost than your tapped-out search campaigns.

  • Proving Upper-Funnel Value: When leadership asks if awareness campaigns are actually working, use this model to demonstrate how your investments are consistently expanding the brand's total addressable audience.

The Growth vs. Efficiency Trade-Off

Before diving into the data, it is critical to understand that high ROAS is often an indicator of low incremental growth.This model requires you to prioritize growth metrics over immediate conversion margins:

• High ROAS / Low % New Reach: This is Defense/Retention. You are protecting margins, but your brand is stagnating.

• Low ROAS / High % New Reach: This is Prospecting. This is your "acquisition tax." You should judge the success of these campaigns by their Cost per New Reach UV, not their immediate ROAS.

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How to Use It

Strategic Goal	How to Set Up	What to Look For	Strategic Action
Evaluating Acquisition Costs	Group ads by Ad Type (e.g., DSP Video vs. Sponsored Display).	The lowest Cost per New Reach UV and highest % New Reach UV.	Identify your cheapest "new user" engine. Reallocate budget here to maximize top-of-funnel volume for the exact same spend.
Funding the "Seed" Phase	Compare "Brand Defense" campaigns against "Category Prospecting" campaigns.	New Reach UV volume vs. Total Cost.	If Prospecting yields high New Reach at a stable cost, accept the lower ROAS. You are successfully paying to expand your brand's footprint.
Validating DSP Incremental Reach	Create two custom groups: "Sponsored Ads Only" vs. "Sponsored Ads + DSP."	Compare the Reach UV and Cost per New Reach UV between the groups.	If adding DSP significantly lowers the cost of acquiring a new user compared to SP conquesting alone, shift "growth" budget directly into DSP.
Pre-Peak Event Planning	Review a previous lead-up period (e.g., the 4 weeks before Prime Day or Black Friday).	The exact date when Cost per New Reachbegan to rapidly spike.	This is your historical "saturation point." Use this inflection point to plan exactly when to stop building awareness and switch to conversion-focused bidding this year.

 

When reviewing your dashboard, use these quick diagnostics to spot wasted spend or misaligned strategies:

• Flat New Reach + Increased Budget: You are likely focusing too heavily on low-funnel audiences (such as branded search or strict retargeting). To break through this plateau and increase your New-to-Brand (NTB) reach, consider targeting category-adjacent audiences or launching upper-funnel DSP campaigns to feed the top of your funnel.

• High % New Reach + High Cost per UV: You are successfully finding new people, but you are paying a premium to acquire them. You must verify if this expensive prospecting actually pays off. Use the Time to Conversionmodel (specifically the "First Ad Exposure" view) and the Marketing Funnel Analysis model to evaluate if these expensive audiences actually convert downstream.

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FAQ 

Q: How does the model calculate "New Reach"?

A: "New Reach" is defined as a user's absolute first appearance within your selected lookback window (which defaults to 6 months in the predefined models).

Q: How does deduplication work across different time views?

 A: Reach is strictly deduplicated within the time bucket you are viewing. For example, if a user sees your ad on Monday and again on Wednesday, they count as 1 Reach UV in a Weekly report, but they will show up as 1 Reach UV on Monday and 1 Reach UV on Wednesday in a Daily report.

Q:Why do my top-converting Branded campaigns show such low New Reach metrics?

A: This is "The ROAS Inverse." High-ROAS campaigns targeting your own brand name typically have the absolute lowest New Reach UV because the users already know who you are. This model is designed to measure the success of discovery, not brand defense.

Q: Why might some data be missing?

A: To protect shopper privacy, Amazon AMC hides any rows that contain fewer than 2 unique users. If your targeting is extremely narrow, the data might be suppressed.

 

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