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The term email marketing KPIs covers the key performance indicators used to assess the effectiveness of your email campaigns. In 2025, mastering these KPIs is essential to improve your open rate, your click rate, your conversion rate and, overall, the marketing performance of your sends.
These metrics analyze recipient behavior: email opens, link clicks, completed actions or unsubscribes. Understanding data such as the bounce rate, the unsubscribe rate or your list growth is essential to fine-tune your email campaigns. Integrating a high-performing CRM, such as Klaviyo, also gives you a more complete view of your KPIs and lets you personalize your actions more effectively.
For example, the open rate measures how appealing your subject lines are, while the conversion rate assesses your ability to turn leads into customers. By mastering these KPIs, you optimize your results, reduce complaints and maximize your return on investment.
The traditional KPIs that still matter
The open rate
The open rate remains one of the key metrics to monitor in your email campaigns. It represents the percentage of emails sent that were opened by recipients, giving you a measure of how attractive your subject line is and how relevant your sender address is. In 2025, this KPI keeps all its importance, since it directly reflects initial engagement and plays a decisive role in moving toward conversion.
A good open rate is essential before any action aimed at generating clicks or leads, which makes it an unavoidable indicator for successful campaigns. This metric is also tied to deliverability.
The deliverability rate
The delivery rate is the foundation of any email analysis. It corresponds to the percentage of emails that actually reached recipients' inboxes, after escaping bounces and filters. This KPI is decisive because, without delivery, no other metric can be interpreted reliably: not opens, not clicks, not even conversions.
In 2025, closely tracking this rate is crucial to maintaining a good sender reputation and optimizing the overall performance of your campaigns. In Klaviyo, it can be measured through the Received email metric and the Flow Deliverability tab, giving you a clear view of how well your messages actually reach their target. This metric is also linked to the spam rate, which you can read more about in this other article: What is the spam score and how can you reduce it?
The click rate
The click rate quantifies the proportion of recipients who clicked on at least one link in the email, compared with the total number of emails delivered. This KPI is an excellent way to assess the effectiveness of your content, your call to action and the real interest generated by your campaign.
By going beyond the simple open rate, the click rate measures deeper engagement from your audience. It is essential for adjusting the relevance of your messages, refining your creative and optimizing your segmentation.
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The conversion rate
Finally, the conversion rate is arguably the most important metric in email marketing. It represents the percentage of recipients who completed the expected action, whether it is a purchase, a sign-up or a download, after clicking on the email.
This KPI reflects the concrete success of your campaign in turning leads or subscribers into customers or qualified contacts. Tracking it lets you measure the direct profitability of your efforts, whatever the sector or the goals of your marketing strategy.
Average order value (AOV)
The average value of orders generated by your email campaigns is a valuable indicator for assessing the quality of the sales generated. It corresponds to the average amount spent by customers who completed a purchase after clicking on your emails, revealing whether your messages tend to drive small impulse purchases or larger baskets.
This KPI is gaining importance because it measures not only conversion, but also the real financial impact of your sends. Thanks to the native integrations between Klaviyo and e-commerce platforms such as Shopify, revenue and order data flow in automatically, which makes it easy to quickly calculate this value and get a clear view of the return on investment of each campaign. This metric can also be used to create VIP segments, by identifying the customers who spend the most and offering them exclusive communications, thereby strengthening their loyalty and engagement.
The order rate (place order rate)
The order rate is one of the most telling KPIs for e-commerce, since it directly measures the proportion of recipients who completed a purchase following an email. It reflects how effective your campaigns are at turning interest into concrete revenue, beyond simple clicks or opens.
This KPI illustrates the ability of your emails to generate a real commercial impact and to contribute to the overall return on investment of your marketing efforts. Thanks to the native integrations between Klaviyo and platforms such as Shopify, order data flows in automatically, which makes it possible to calculate this rate in real time and to quickly identify the best-performing campaigns. This indicator is therefore essential for steering your e-commerce strategies and adjusting your content based on the results obtained.
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The rise of new analytics techniques for 2025
Integrating AI into behavior analysis
Artificial intelligence is reshaping how data from email campaigns is analyzed. With AI, it is possible to extract deep insights by combining traditional key performance indicators with new behavioral signals, such as micro-interactions or engagement frequency.
This technology also enables hyper-targeted personalization. By automatically adapting the content to the recipient's profile and the optimal send time, it improves open and conversion rates. AI is thus becoming a central pillar of modern marketing strategies, maximizing the impact of every campaign.
How to optimize performance based on the KPIs you identify
Advanced personalization and segmentation
To maximize the impact of your email campaigns, personalization and advanced segmentation are essential levers. By dividing your contact base into precise segments based on demographic, behavioral or purchase-history criteria, you can tailor the content and offers to each group of recipients. This targeted approach significantly improves the email open rate and the click rate, because the messages become more relevant and engaging.
What's more, segmentation helps increase the conversion rate by offering a personalized experience, while reducing the unsubscribe rate thanks to a better match with subscribers' expectations.
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Strategic use of automation and artificial intelligence
Integrating automation and artificial intelligence (AI) tools is revolutionizing how email campaigns are managed and optimized. These technologies make it possible to deploy complex scenarios based on the behavior of leads and subscribers, automatically sending personalized messages at the right moment.
Through predictive analytics and dynamic segmentation, AI improves your key performance indicators by refining recipient selection and adapting the content in real time. These innovations help increase campaign open rates, the click rate and, ultimately, conversions.
A/B testing and continuous analysis
Using A/B tests is an essential method for optimizing every element of your email campaigns, whether it is the subject line or the call to action. By comparing different versions of your emails, you can pinpoint exactly what works best with your audience, whether in terms of the open rate or the click rate.
Combined with continuous analysis of your KPIs, this practice allows for regular adjustments, supporting steady and measurable progress. By systematically incorporating the feedback you gather, you improve the quality of your emails, maximize the profitability of your campaigns and reduce bounce and complaint rates.
Conclusion
To succeed with your campaigns in 2025, it is essential to master the traditional email marketing KPIs such as the open rate, the click rate and the conversion rate. At the same time, new and innovative metrics, such as real-time engagement and the email retention rate, are gaining importance, particularly thanks to the integration of artificial intelligence (AI). By betting on advanced personalization, intelligent automation and rigorous A/B testing, you will be able to optimize your performance and significantly improve your overall results.
Don't wait any longer: analyze your key performance indicators and adjust your strategy to maximize your marketing impact.
FAQ
How do I choose the most relevant email marketing KPIs to assess my campaign performance in 2025?
To identify the most suitable email marketing KPIs in 2025, focus on those that measure both the engagement and the profitability of your campaigns. Among the key metrics are: the open rate, the click rate (CTR), the conversion rate, the unsubscribe rate, the bounce rate, list growth, customer lifetime value and return on investment (ROI). These metrics are essential for assessing the effectiveness of your actions and adjusting your strategy.
What impact do the new privacy regulations have on tracking email marketing KPIs?
The new privacy regulations, in particular the strengthened GDPR in 2025, require explicit consent for tracking KPIs such as opens and clicks. This limits the collection of behavioral data, which can affect tracking accuracy and the measurement of your email campaign performance. It is becoming essential to adopt compliant strategies while continuing to maximize the impact of your emails.
How should I interpret variations in the open rate and the click rate to optimize my email campaigns?
The open rate reflects the initial interest in your email, while the click rate measures engagement with its content. If the open rate is high but the click rate is low, it may indicate that the content or the CTA (call to action) needs adjustment. Conversely, a low open rate may signal a problem with the email's subject line or its deliverability.
To optimize your campaigns, analyze these metrics together so you can improve both the targeting and the content of your emails.
Which key metrics should I track to improve deliverability and reduce the unsubscribe rate?
To improve deliverability and reduce the unsubscribe rate, monitor the following metrics: the open rate, the click rate, the unsubscribe rate, the bounce rate and the complaint rate for spam. This data lets you assess the engagement and quality of your emails, while directly influencing your sender reputation and your ability to reach your recipients' inboxes.
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