Definition
An email readability score is a numeric assessment of how easy a piece of email copy is to understand, usually derived from formulas that weigh average sentence length, word length, and syllable count. Common scoring systems include the Flesch Reading Ease and Flesch-Kincaid Grade Level. A lower grade level generally means the text is accessible to a broader audience.
How It Works
Readability formulas analyze text characteristics to estimate the education level needed to read it comfortably. For example, a grade level of eight means the content is roughly accessible to a reader with an eighth-grade education. Email marketers aim for lower scores because marketing messages should be skimmable and understood quickly. Long sentences, jargon, and uncommon vocabulary all push the score higher.
Readability scoring fits naturally into the email production workflow. Writers can run copy through a readability tool before sending, then revise sentences that inflate the score. The result is copy that communicates faster, which matters in an inbox where attention is measured in seconds. Readability also interacts with other elements such as tone of voice and email copy length, since shorter, simpler sentences tend to score better.
Best Practices
- Aim for a reading grade level around six to eight for broad marketing emails.
- Shorten long sentences and break dense paragraphs into smaller blocks.
- Replace jargon and technical terms with plain-language alternatives.
- Use active voice and concrete verbs.
- Review the score as a guideline, not an absolute rule, since it does not measure clarity of ideas.
Example
A B2B company drafts an email with long, technical sentences that score at a twelfth-grade reading level. After editing, it breaks compound sentences apart and swaps terms like "utilize" for "use" and "facilitate" for "help." The revised copy scores at a seventh-grade level, and the team observes stronger engagement on the campaign, consistent with its emphasis on email copy clarity.
Was this useful?
Related Glossary Terms
Account-Based Marketing Email
An account-based marketing email is a highly targeted message sent to a specific organisation or decision-maker group as part of a focused B2B strategy.
AI Content Detection
AI content detection refers to the growing ability of email clients, spam filters and consumers to identify machine-generated email copy. It matters for deliverability, trust and engagement in an era of mass-produced AI marketing email.
AI-Generated Content in Email
AI-generated content in email is copy, images, code or subject lines produced by artificial intelligence tools to speed up campaign production and testing.
AIDA Model for Email
The AIDA model (Attention, Interest, Desire, Action) is a classic copywriting framework used to structure email campaigns that guide subscribers from awareness to conversion.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.
Authority Principle in Email Marketing
The authority principle is a persuasion concept where people trust and follow the guidance of perceived experts, used in email marketing through credentials, certifications, and expert positioning.
Frequently Asked Questions
A reading level of roughly sixth to eighth grade is a common target for mass-market and B2B emails alike, since it maximizes comprehension.
Not necessarily. The score should match the audience. Technical audiences may expect some specialized vocabulary, though clarity still matters.
Clear, simple copy tends to support higher engagement, but readability is one factor among many, alongside design and email strategy.