The percentage of recipients who open a marketing email out of the total delivered.

What it Measures ?

How many people opened your email.

Relevant StakeHolders 

Email Marketers

In-depth Use Case / Real-world Example

Email Open Rate is a basic but essential KPI that measures how successful your subject lines and sender names are in capturing recipients' attention. It is calculated by dividing the number of opened emails by the total number delivered and multiplying by 100. For instance, if a manufacturing company sends out 3,000 newsletters and 600 are opened, the open rate is 20%. This metric provides the first indication of how well your email campaign is resonating at a glance. In manufacturing marketing, emails might promote new product launches, updates on supply chain solutions, invitations to industry webinars, or case study highlights. A low open rate can signal issues with subject line clarity, timing, or audience relevance. Conversely, a high open rate suggests your email is effectively aligned with the interests and expectations of your recipients. Manufacturing companies can segment lists by job function—like operations, procurement, or engineering—and tailor subject lines accordingly. For example, “Boost Your Factory Uptime with Real-Time Monitoring” might resonate more with plant managers than “Explore Our New Solutions.” Open rate trends also help marketers refine send times and personalize campaigns. While open rates can be skewed by privacy settings in some email clients, they still serve as a useful directional metric when combined with click-through and conversion rates. Monitoring this KPI ensures email marketing efforts are getting the visibility needed to drive further engagement.