Email Open Rate

Metric · 2 min read

Email open rate

Email Open Rate shows the percentage of recipients who open your email campaigns. Here’s everything you need to know: what it is, why it matters, how to calculate it, and how to improve it!

Formula

Email Open Rate (%)=Unique OpensEmails Delivered× 100

Example. If you send 5,000 emails and 1,000 recipients open them, your Email Open Rate is 20%. This indicates one out of every five recipients engaged with your subject line and opened the message.

Try it

Email Open Rate (%)—

Overview

What it is

Email Open Rate is a metric that measures the percentage of successfully delivered emails that were opened by recipients. It’s commonly used to assess subject line effectiveness, send timing, and subscriber engagement.

Why it matters

Email Open Rate helps marketers evaluate how well their emails are capturing attention. A strong open rate typically leads to better click-through and conversion rates, while low open rates may indicate issues with content, timing, or deliverability.

How it is calculated

Divide the number of unique opens by the number of delivered emails and multiply by 100 to express the result as a percentage.

Good and bad values

A good value

A good Email Open Rate varies by industry, but 20–30% is often considered healthy. Higher rates suggest your emails are reaching and resonating with the right audience.

A bad value

An Email Open Rate below 15% may indicate poor subject lines, weak sender reputation, bad timing, or outdated email lists.

Do and avoid

Do

Use these proven tips to boost your Email Open Rate and increase email campaign effectiveness.

  1. 01

    Craft compelling subject lines

    Use curiosity, urgency, or personalization to grab attention and encourage recipients to open your emails.

  2. 02

    Optimize send timing

    Test different days and times to find when your audience is most likely to check and open emails.

  3. 03

    Maintain a clean email list

    Regularly remove inactive subscribers to improve deliverability and engagement rates.

Avoid

  1. Don’t use misleading subject lines or send too frequently. Ignoring mobile formatting and authentication protocols can also reduce open rates.

Customer stories

What users are saying

Not testimonials. Comment threads.

Real things real customers said — each quote pinned to a specific claim, straight from the quotes database.

A9re: one source of truth
Mark SimmonsMark SimmonsCMO, Pürblack®
“We had six or seven different channels and no single source of truth — it was almost impossible, a lot of guesswork.”
C3re: golden data
Nodari RizunNodari RizunFounder & CEO, Pürblack®
“Golden data is clean data — the measure of reality, true and not false, that you can trust based on its source. If you have that, you're good.”
E5re: dashboards vs truth
Nodari RizunNodari RizunFounder & CEO, Pürblack®
“Most businesses look at a Shopify or Google Analytics dashboard and think it's the source of truth. It's not — that data was never cleaned.”

Your New Normal

Calculate Email Open Rate on your own data.

OWOX Data Marts integrates with your email platforms to analyze open rate trends by audience, timing, and subject line. Gain insights into what drives engagement and refine your email strategy for better results.

  • No AI hallucinations
  • Analyst-governed definitions
  • Every number traces to SQL
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