Customer.ioMarketing AutomationEmail Click-Through Rate
Email click-through rate measures the percentage of delivered Customer.io emails where the recipient clicked at least one link. It indicates how effectively email content drives recipients to take the next step in your desired journey, bridging the gap between opening a message and converting.
Customer.io metric
Click-Through Rate = (Unique Clicks / Emails Delivered) x 100
Email click-through rate measures the percentage of delivered Customer.io emails where the recipient clicked at least one link. It indicates how effectively email content drives recipients to take the next step in your desired journey, bridging the gap between opening a message and converting.
Full guide: definition, formula, and benchmarksHow to calculate Email Click-Through Rate
Click-Through Rate = (Unique Clicks / Emails Delivered) x 100
Why Email Click-Through Rate matters for Customer.io users
Opens indicate awareness; clicks indicate intent. A high open rate with a low click-through rate suggests your subject lines work but your content or calls to action do not. This metric is the critical middle step between engagement and conversion in your lifecycle messaging funnel.
Positioning click-through rate in your metric tree between open rate and conversion rate reveals whether content quality is the bottleneck in your messaging performance. Statistical correlations show which click-through patterns predict downstream conversions.
Driver
Conversion rate
Outcome · 58% contribution
Revenue
Understand and act on Email Click-Through Rate with KPI Tree
KPI Tree syncs click-through rate data from your warehouse and positions it within your email engagement metric tree. Track CTR per campaign, workflow, and segment to identify patterns.
Assign RACI ownership to your content team. Set alerts when CTR drops below historical baselines and track optimisation actions such as content changes, CTA adjustments, and layout tests.
Get started with your Customer.io data
MCPPull metrics from Customer.io directly through the Model Context Protocol.
Connect your existing warehouse where Customer.io data already lands.
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Related Customer.io metrics Ready to add to your trees.
Email Open Rate
Marketing AutomationOpen Rate = (Unique Opens / Emails Delivered) x 100
Email open rate measures the percentage of delivered Customer.io emails that were opened by recipients. While affected by privacy features like Apple Mail Privacy Protection, it remains a useful directional indicator of subject line effectiveness and sender reputation when tracked consistently over time.
View metricCampaign Conversion Rate
Marketing AutomationCampaign Conversion Rate = (Conversions / Messages Delivered) x 100
Campaign conversion rate measures the percentage of recipients who complete a desired action after receiving a Customer.io campaign message. It connects message delivery to business outcomes such as purchases, signups, or feature activations, providing a direct measure of campaign effectiveness.
View metricEmail Engagement Score
Marketing AutomationEmail engagement score is a composite metric that combines open rates, click-through rates, conversion rates, and recency of interaction to produce a single score representing a Customer.io subscriber's engagement level. It provides a holistic view of subscriber health beyond any single engagement metric.
View metricEmail Revenue per Recipient
Marketing AutomationRevenue per Recipient = Total Attributed Revenue / Emails Delivered
Email revenue per recipient measures the average revenue attributed to each recipient of a Customer.io campaign or workflow. It combines delivery volume with revenue attribution to quantify the monetary value each email generates, providing a direct link between messaging activity and financial outcomes.
View metricEmail Unsubscribe Rate
Marketing AutomationUnsubscribe Rate = (Unsubscribes / Emails Delivered) x 100
Email unsubscribe rate measures the percentage of Customer.io email recipients who opt out of future communications after receiving a message. It serves as a direct indicator of message relevance, frequency appropriateness, and audience-content alignment.
View metricExplore Email Click-Through Rate across integrations
All Customer.io metrics
A/B Testing AnalysisBroadcast vs Campaign PerformanceCampaign Attribution AnalysisCampaign Conversion RateMarketing ROICustomer Attribute AnalysisCustomer Journey MappingCustomer Reactivation RateEmail Deliverability AnalysisEmail Engagement ScoreEmail Funnel AnalysisEmail Open RateEmail Revenue per RecipientEmail Unsubscribe RateEvent-Driven Engagement AnalysisLifecycle Stage ProgressionMessage Deliverability RateMessage Frequency OptimisationNewsletter Subscriber ChurnSegment Growth RateSegmentation Performance AnalysisTransactional Message Success RateWorkflow Completion RateWorkflow Drop-Off AnalysisCampaign ROIEmpower your team to understand and act on Customer.io data
Map what drives your metrics, measure progress at any grain, prove what works statistically, and deliver personalised action plans to every team member.
