Klaviyo Metric
Email Marketing
Open Rate = (Unique Opens / Emails Delivered) x 100
Email open rate measures the percentage of delivered Klaviyo emails that were opened by recipients. While affected by Apple Mail Privacy Protection and other privacy features, it remains a useful directional indicator of subject line effectiveness, sender reputation, and brand affinity when tracked consistently.
Full guide: definition, formula, and benchmarksKlaviyoEmail MarketingEmail Open Rate
Email open rate measures the percentage of delivered Klaviyo emails that were opened by recipients. While affected by Apple Mail Privacy Protection and other privacy features, it remains a useful directional indicator of subject line effectiveness, sender reputation, and brand affinity when tracked consistently.
How to calculate email open rate
Why email open rate matters for Klaviyo users
Open rate is the first engagement signal in your email funnel. For e-commerce, a declining open rate means fewer eyes on your products, offers, and content - directly limiting the pool of potential converters. The cause may be subject line fatigue, frequency issues, or deliverability problems.
Positioning open rate in your metric tree as a gateway metric reveals how changes cascade through clicks, conversions, and revenue. Statistical correlations show which subject line patterns, send times, and segments produce the strongest open-to-revenue relationships.
Understand and act on email open rate with KPI Tree
KPI Tree syncs open rate data from your warehouse and tracks it per campaign, flow, segment, and time period. Position it at the top of your email engagement funnel tree.
Assign RACI ownership to your email copywriting team. Set alerts when open rates drop below rolling averages and track subject line testing, send time optimisation, and list hygiene actions.
Get started with your Klaviyo data
MCPPull metrics from Klaviyo directly through the Model Context Protocol.
Connect your existing warehouse where Klaviyo data already lands.
Our professional services team can build you turn-key AI foundations in a matter of weeks. Data warehouse on Snowflake/BigQuery, ELT with Fivetran, all modelled in dbt with a semantic layer.
Related Klaviyo metrics
Click-Through Rate
Email MarketingMetric Definition
Click-Through Rate = (Unique Clicks / Emails Delivered) x 100
Click-through rate measures the percentage of delivered Klaviyo emails where the recipient clicked at least one link. It indicates how effectively your email content and calls to action drive recipients to take the next step in their customer journey.
Email Engagement Scoring
Email MarketingMetric Definition
Email engagement scoring assigns a composite score to each Klaviyo subscriber based on their open, click, purchase, and recency patterns. It provides a unified view of subscriber engagement that goes beyond any single metric to identify highly engaged, at-risk, and disengaged subscribers.
Email Deliverability Rate
Email MarketingMetric Definition
Deliverability Rate = (Emails Delivered / Emails Sent) x 100
Email deliverability rate measures the percentage of Klaviyo emails that are successfully delivered to recipients' inboxes without bouncing. It encompasses hard bounces, soft bounces, and spam folder placement to assess the technical health of your email programme and sender reputation.
Flow Conversion Rate
Email MarketingMetric Definition
Flow Conversion Rate = (Flow Conversions / Flow Recipients) x 100
Flow conversion rate measures the percentage of recipients who enter a Klaviyo automated flow and subsequently complete the desired conversion action - such as a purchase, signup, or re-engagement. It quantifies how effectively your automated sequences drive their intended outcomes.
Unsubscribe Rate
Email MarketingMetric Definition
Unsubscribe Rate = (Unsubscribes / Emails Delivered) x 100
Unsubscribe rate measures the percentage of Klaviyo email recipients who opt out of future communications after receiving a message. It serves as a direct indicator of message relevance, frequency appropriateness, and the overall health of the relationship between your brand and its subscribers.
Explore email open rate across integrations
All Klaviyo metrics
Abandoned Cart Recovery RateCampaign Performance ComparisonClick-Through RateCoupon Redemption RateCross-Sell Email EffectivenessCustomer Journey Flow AnalysisCustomer Lifetime Value (Email)Email Attribution AnalysisEmail Deliverability RateEmail Engagement Cohort AnalysisEmail Engagement ScoringEmail Frequency OptimisationEmail List Health ScoreEmail Revenue AttributionEmail ROIEvent-Triggered Flow PerformanceFlow Conversion RateForm Conversion RateList Growth RateProfile Enrichment RateRepeat Purchase Rate (Email)Segment Performance AnalysisTemplate Performance OptimisationUnsubscribe RateEmpower your team to understand and act on Klaviyo data
Map what drives your metrics, measure progress at any grain, prove what works statistically, and deliver personalised action plans to every team member.
