Email Open Rate Explained: What’s Considered Good? | Benchmark Guide

I’ve been analyzing email marketing metrics for over a decade, and I still see marketers obsess over open rates in ways that miss the point entirely. Yes, open rates matter—but not for the reasons most people think. Before I explain what a good open rate actually looks like in 2025, let me be direct about something: the metric itself is deeply flawed, and treating it as the ultimate measure of email success will lead you astray more often than it will help you.

That said, understanding open rates—how they’re calculated, what benchmarks exist, and why they fluctuate—is essential for anyone sending commercial email. This guide breaks down everything you need to know, including some uncomfortable truths that the major email platforms rarely admit.

What Is an Email Open Rate?

An email open rate measures the percentage of recipients who opened a specific email out of the total number of delivered emails. Most email marketing platforms calculate it using this formula:

(Number of Opens ÷ Number of Delivered Emails) × 100 = Open Rate %

Here’s where things get complicated. An “open” is recorded when a recipient’s email client loads a tiny invisible pixel—a 1×1 tracking image—embedded in the email HTML. If a user reads your email with images disabled, the pixel doesn’t load, and your open goes unrecorded. If they open the email on a device that blocks tracking by default (many mobile email clients do), you won’t get credit.

This means your reported open rate is almost certainly lower than your actual open rate. Industry experts have estimated the tracking gap ranges from 10% to 30%, depending on your audience and email design. Litmus, in their annual email analytics reports, has documented this discrepancy extensively. The 2023 Email Marketing Benchmark Report noted that Apple Mail’s privacy features, introduced in 2021 and expanded since, have further obscured true open behavior.

The metric was never perfect. It’s becoming less reliable every year as privacy-conscious email clients and browser settings increasingly block tracking pixels.

What’s Considered a Good Open Rate? Industry Benchmarks

The commonly cited average open rate across all industries hovers between 19% and 23%, depending on which report you consult. Mailchimp’s 2024 Email Marketing Benchmarks reported a global average of 21.33% for marketing emails. HubSpot’s data, which tends to skew toward B2B and higher-complexity campaigns, places the average closer to 18%.

Here’s how open rates break down by sector, based on aggregated industry data:

A “good” open rate ultimately depends on your specific context. A B2B software company sending quarterly product updates to a highly targeted list of 500 prospects might legitimately achieve 35% open rates. A retail brand sending a weekly newsletter to a list of 50,000 subscribers would celebrate 22% as a strong result.

What matters more than the raw percentage is consistency. If your open rates fluctuate wildly from campaign to campaign without intentional changes, that’s a sign something is wrong with your sending strategy, list hygiene, or subject line approach.

Why Open Rates Vary So Dramatically

Several factors influence open rates in ways that have nothing to do with the quality of your content:

List quality is the foundation. Purchased email lists produce catastrophic open rates—often below 5%—because the recipients never opted in and have no relationship with your brand. Even organic lists degrade over time if you don’t regularly remove inactive subscribers. A list that was gold three years ago might now be full of addresses that bounce, get marked as spam, or simply ignore your messages.

Sender reputation affects deliverability, which directly impacts open rates. If your emails land in spam folders (or worse, get blocked entirely), your delivery-to-open pipeline is already broken. Tools like Google Postmaster Tools and third-party spam filter testers can help you diagnose reputation issues before they tank your metrics.

Subject line relevance accounts for a significant portion of open rate variance. A subject line that clearly communicates value and creates urgency will outperform a generic or vague alternative almost every time. But relevance is subjective—what excites one segment of your list may bore another, which is why segmentation matters so much.

Timing and frequency also move the needle. Tuesday through Thursday mornings typically see higher open rates than Mondays (when inboxes are flooded) or Fridays (when attention wanders). Sending too frequently breeds list fatigue; sending too rarely makes you forgettable. Finding the sweet spot requires testing and listening to unsubscribe data.

Email client behavior creates noise in your data. Apple Mail users now have Privacy Protection enabled by default, which automatically opens emails and marks them as read to prevent sender tracking. This artificially inflates open rates for lists with significant Apple Mail audiences—a phenomenon that has skewed industry benchmarks since 2021. If your list skews toward Apple users (especially iPhone owners), your open rates may look better than they actually are.

What Actually Improves Open Rates

Most articles on this topic will tell you to “write better subject lines” and “personalize more.” That’s not wrong, but it’s incomplete. Here are five tactics that actually work:

Clean your list aggressively. I recommend removing subscribers who haven’t opened an email in six months from your active campaigns. Move them to a re-engagement sequence—three emails over two weeks with increasingly direct calls to action. If they still don’t engage, suppress them. A smaller, more engaged list will outperform a bloated list every single time.

Segment by engagement level. Don’t send the same email to everyone. Create segments based on past open behavior: highly engaged (opened last three emails), moderately engaged (opened one of last three), and inactive. Tailor your frequency, subject lines, and content to each group. Highly engaged subscribers can handle more frequent sends. Inactive subscribers need fewer, more compelling emails—or removal.

Optimize for preview text. Most marketers obsess over subject lines while ignoring the preview text—the snippet that appears alongside or below the subject line in most email clients. This text is your second chance to convince someone to open. Make it complementary to your subject line, not redundant.

Test send times systematically. The “best time to send” advice you’ll find online is a starting point, not a guarantee. Your specific audience may behave differently. Run A/B tests across different days and times, tracking results over at least four weeks to account for monthly cycles. Look for patterns in your own data rather than relying on generic recommendations.

Pay attention to preheader text. The preheader is the preview snippet that follows your subject line in most email clients. It defaults to the first few lines of your email body, but you can customize it. Use it as an extension of your subject line, not as filler.

The Truth About Open Rate Obsession

I need to be honest with you: open rate is a vanity metric more than an action metric. It tells you whether people opened, but not why—and certainly not whether that open led to anything valuable.

A 40% open rate means nothing if none of those readers took the next step. Conversely, a 15% open rate might represent excellent performance if your list is small, highly qualified, and those opens convert at high rates.

What you should actually care about is the relationship between open rate and downstream metrics. Are people who open your emails clicking through? Are they converting? If your open rates are stable but your clicks and conversions are declining, you have a content or offer problem—not an open rate problem.

The email platforms that dominate this space—HubSpot, Mailchimp, Klaviyo—emphasize open rates because it’s the metric they can track most easily. It makes their dashboards look good. But serious email marketers know that click-through rate, conversion rate, and revenue per email are far more actionable.

FAQ: Common Questions About Email Open Rates

Is a 20% open rate good?
For most industries, yes. The global average sits around 21%, so 20% places you in typical territory. Whether that performance is “good” depends on your industry, list size, and email type. B2B campaigns often see lower open rates than B2C. Transactional emails typically see much higher engagement than marketing newsletters.

What is considered a low open rate?
Below 15% is generally concerning for most organic, permission-based lists. Below 10% suggests serious problems—either your list quality has degraded, your subject lines are failing to resonate, or your emails aren’t reaching the inbox. However, thresholds vary by industry. A real estate agent might expect lower open rates than a non-profit organization.

Why are my open rates suddenly dropping?
Common causes include: increased spam complaints, sender reputation damage, list fatigue from over-sending, changes in email client privacy settings (especially Apple Mail), and seasonal shifts in audience behavior. Check your deliverability scores first, then audit your sending frequency and recent subject line changes.

How is open rate different from click-through rate?
Open rate measures who opened the email. Click-through rate (CTR) measures who clicked at least one link within the email. You can have high open rates but low CTR if your email content doesn’t include compelling calls to action or if links are difficult to tap (especially on mobile).

Where Email Marketing Metrics Are Heading

The email marketing landscape is evolving rapidly, and the limitations of open rate tracking are accelerating this evolution. Apple’s Mail Privacy Protection has already distorted open rate data for millions of marketers. Google and other providers are following suit with their own privacy enhancements.

Forward-thinking email marketers are already shifting focus. Engagement metrics that can’t be easily spoofed—click-through rates, conversion rates, time spent reading, forward and share actions, and ultimately revenue attribution—are gaining prominence. Klaviyo and other platforms are investing heavily in these alternative measurements.

My prediction: within three to five years, open rate will be treated as a secondary metric at best for most email programs. The industry will develop new ways to measure genuine engagement, and the brands that adapt earliest will have a significant advantage.

What you can do now: start building your case studies and attribution models around click and conversion data. Document the relationship between opens and downstream actions in your own program. When open rates become unreliable, you’ll have the context you need to explain performance to stakeholders who still rely on familiar metrics.

The fundamentals haven’t changed: send relevant content to engaged recipients at the right time, and optimize relentlessly for the actions that actually drive your business forward. Open rate was never the destination. It’s just one signal along the way.