Ad Completion Rate

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Ad Completion Rate refers to the percentage of viewers who watch an entire advertisement from start to finish, without skipping or abandoning it before its completion. It is a key metric used in advertising to evaluate the effectiveness and engagement level of video ad campaigns. Ad Completion Rate provides insights into audience behavior and the extent to which an advertisement captures and retains viewers' attention.

In digital advertising, Ad Completion Rate is often associated with video ads, particularly those delivered through online streaming platforms, social media channels, and other digital platforms. It reflects the success of an ad in maintaining viewer interest and persuading them to watch the ad in its entirety.

Ad Completion Rate is calculated by dividing the number of viewers who watched the entire ad by the total number of viewers who were exposed to the ad, and then multiplying the result by 100 to express it as a percentage. For example, if 500 viewers watched an ad and 400 of them watched it to completion, the Ad Completion Rate would be calculated as (400/500) * 100 = 80%.

Understanding Ad Completion Rate is crucial for advertisers and marketers as it provides valuable insights into the effectiveness of their advertising campaigns. A high Ad Completion Rate indicates that the ad successfully engaged viewers and held their attention throughout its duration, suggesting that the ad content, format, and targeting resonated well with the audience. On the other hand, a low Ad Completion Rate may indicate that the ad failed to capture viewers' interest or that it was not relevant or compelling enough to retain their attention. For example, in a research published by Michele Majidi, statistics of viewer completion rates of CTV worldwide 2022, by ad length was calculated. It can be seen in the graph below!

Source: Statista. Worldwide Evaluation of CTV Advertising Effectiveness: Viewer Completion Rate Patterns Across Different Ad Durations in 2022

By analyzing Ad Completion Rate alongside other performance metrics such as click-through rates, conversion rates, and brand recall, advertisers can gain a comprehensive understanding of the effectiveness of their video ad campaigns. This data can inform future advertising strategies, content optimization efforts, and media planning decisions to improve campaign performance and maximize ROI.


In neuromarketing, Ad Completion Rate serves as a valuable metric for assessing the impact of video advertisements on consumers' cognitive and emotional responses. By measuring the extent to which viewers engage with and complete an ad, neuromarketers can gain insights into the effectiveness of different ad formats, messaging strategies, and creative elements in capturing and maintaining audience attention.

Functions of Ad Completion Rate in neuromarketing include:

  1. Engagement Assessment: Ad Completion Rate helps neuromarketers evaluate the level of engagement elicited by video advertisements. Higher completion rates indicate greater viewer interest and attention, suggesting that the ad content resonates well with the target audience.
  2. Attention Retention: Neuromarketers analyze Ad Completion Rate to understand how effectively ads retain viewers' attention throughout their duration. Ads with high completion rates are likely to sustain attention and keep viewers engaged, leading to better message retention and brand recall.
  3. Effectiveness Evaluation: Ad Completion Rate serves as a proxy for ad effectiveness in neuromarketing studies. Neuromarketers compare completion rates across different ad variations or experimental conditions to identify which ad elements or strategies are most successful in captivating audience interest and driving message delivery.
  4. Neurological Response Correlation: Neuromarketers may correlate Ad Completion Rate with neurological responses recorded during brain imaging studies, such as EEG or fMRI scans. This allows them to link patterns of brain activity with behavioral indicators of ad engagement, providing deeper insights into the neural mechanisms underlying consumer response to advertising stimuli.
  5. Optimization Insights: By analyzing Ad Completion Rate data, neuromarketers can optimize video ad content and delivery strategies to enhance audience engagement and maximize campaign effectiveness. Insights from completion rate metrics inform decisions regarding ad length, pacing, storytelling techniques, and call-to-action placement.

Overall, Ad Completion Rate plays a crucial role in neuromarketing research by providing quantifiable measures of audience engagement and ad effectiveness, which inform strategic decision-making and campaign optimization efforts.


Imagine a beverage company launching a new online advertising campaign to promote its latest energy drink. The marketing team creates several video ads showcasing the product's unique features, benefits, and flavors. To evaluate the effectiveness of these ads, the company conducts a neuromarketing study focused on Ad Completion Rate.

Participants are recruited to watch the different ad variations while their brain activity is monitored using EEG technology. Throughout the viewing session, researchers track participants' engagement levels and measure Ad Completion Rate to assess how many viewers watch each ad in its entirety.

The results reveal interesting insights:

  1. Ad A, featuring high-energy visuals and catchy music, achieves a significantly higher Ad Completion Rate compared to Ad B, which focuses more on product specifications and ingredients. This suggests that viewers are more likely to engage with ads that evoke positive emotions and excitement.
  2. Ad C, which includes a compelling narrative about the drink's benefits and its impact on consumers' lives, also garners a high Ad Completion Rate. This indicates that storytelling elements can effectively captivate audience attention and drive ad engagement.
  3. Ad D, a shorter and more concise ad format, surprisingly outperforms longer ad formats in terms of Ad Completion Rate. This suggests that brevity and simplicity can sometimes be more effective in holding viewers' interest and encouraging them to watch the entire ad.

Based on these findings, the beverage company can refine its advertising strategy by emphasizing energetic visuals, incorporating storytelling elements, and experimenting with shorter ad formats to maximize Ad Completion Rate and overall campaign effectiveness.

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