Email Marketing Metrics That Actually Matter (And How to Track Them)
Email marketing isn’t just about sending pretty messages-it’s about getting results. But with dozens of metrics to look at, how do you know what really matters?
Spoiler alert: it’s not just open rates.
If you’re spending time writing, designing, and sending campaigns, you deserve to know what’s working-and what’s not. So let’s break down the email marketing metrics that actually matter, why they matter, and how you can track them like a pro.
1. Open Rate (Still Useful, But With a Caveat)
What it tells you:
How many people opened your email compared to how many received it.
Why it matters:
It gives you a rough idea of how effective your subject lines are and whether your audience is engaging.
BUT: With Apple Mail Privacy Protection and other privacy tools hiding open data, open rates aren’t as reliable as they used to be.
How to track it:
Your ESP (Email Service Provider) like Mailchimp, ConvertKit, or Klaviyo will show this, but take it with a grain of salt.
2. Click-Through Rate (CTR)
What it tells you:
The percentage of recipients who clicked on a link in your email.
Why it matters:
It shows how engaging your content is and whether people are taking action. This is one of the most important indicators of real interest.
How to track it:
Most ESPs report this automatically. You can also use UTM parameters in your links and track behavior in Google Analytics under Acquisition > Campaigns.
3. Click-to-Open Rate (CTOR)
What it tells you:
Of the people who opened your email, how many actually clicked?
Why it matters:
It gives you deeper insight than CTR alone. A low CTOR means your content didn’t match expectations set by your subject line or wasn’t compelling enough.
How to track it:
Many ESPs like MailerLite, ActiveCampaign, and HubSpot show this in reporting dashboards.
4. Conversion Rate
What it tells you:
How many people completed a desired action (purchase, sign-up, download) after clicking your email.
Why it matters:
This is the end game. Whether you’re selling a product, promoting a webinar, or growing your list-this is what you really care about.
How to track it:
Use UTM tracking on email links and set up Goals in Google Analytics or Conversion Events in GA4. Tools like Shopify, WooCommerce, or Teachable also integrate to track email-driven conversions.
5. Bounce Rate
What it tells you:
The percentage of emails that couldn’t be delivered.
Hard bounces = invalid or non-existent addresses (remove immediately)
Soft bounces = temporary issues (like full inboxes)
Why it matters:
High bounce rates damage your sender reputation and can get you flagged as spam.
How to track it:
ESPs provide bounce reports. Keep your bounce rate under 2% for best deliverability.
6. Unsubscribe Rate
What it tells you:
How many people opted out after receiving your email.
Why it matters:
A spike in unsubscribes could mean your content is off-target or too frequent. Some churn is normal, but consistent losses mean it’s time to tweak your approach.
How to track it:
Built into your ESP’s analytics dashboard.
7. Spam Complaint Rate
What it tells you:
How many people marked your email as spam.
Why it matters:
Even a small number of complaints can hurt your domain reputation and land future emails in the spam folder.
How to track marketing metrics:
Most ESPs report spam complaints. Aim to keep it under 0.1% per campaign.
8. List Growth Rate
What it tells you:
How fast your list is growing (or shrinking).
Why it matters:
It helps you assess the effectiveness of your lead generation efforts and whether you’re keeping subscribers engaged long-term.
How to track marketing metrics:
Formula:
(New subscribers – Unsubscribes) ÷ Total subscribers x 100
Track over time to spot trends and evaluate lead magnets or signup sources.
Bonus: Revenue per Email / Subscriber
What it tells you:
The financial ROI of your email campaigns.
Why it matters:
It connects email engagement directly to revenue. Especially important for eCommerce or digital product sellers.
How to track marketing metrics:
Use platform integrations (e.g., Klaviyo + Shopify) or custom tracking with UTM links + GA4/Shopify analytics.
Final Thoughts on Email Marketing Metrics That Actually Matter (And How to Track Them)
Don’t drown in data. Focus on the metrics that actually align with your goals-whether it’s more clicks, more conversions, or higher retention.
