The 8 Email Marketing Metrics That Actually Matter
Which email metrics to track (and which to ignore), what each one tells you, and simple ways to improve them — explained for small businesses.
In short: Focus on conversions, click rate, unsubscribe rate, spam complaints, bounces and list growth. Treat open rate as a rough trend only, review the numbers once a month, and compare against your own past results rather than industry averages.
Email reports are full of numbers. Only a few of them tell you whether email is working for your business. Here are the eight worth watching, in order of importance.
1. Conversions (bookings, orders, sign-ups)
The reason you send email. Count the actions that matter to you: orders, booked appointments, event registrations, quote requests. If you sell online, track revenue per email. If you can't track it automatically, ask customers "How did you hear about us?" and note answers that mention email.
2. Click rate
The percentage of delivered emails where someone clicked a link. Clicks are deliberate actions, which makes this your most reliable engagement number. Improve it with one clear main button, links early in the email, and content people actually want.
3. Click-to-open rate
Clicks divided by opens: of the people who opened, how many found something worth clicking? It tells you whether the content worked, separate from the subject line.
4. Unsubscribe rate
A small, steady trickle of unsubscribes is healthy — people whose interests changed are leaving cleanly. Watch for spikes after a particular email: a sign you sent too often, too much, or something off-topic.
5. Spam complaint rate
The share of recipients who clicked "Report spam". This one matters enormously for deliverability: Gmail asks senders to stay under 0.3%, and good senders sit far below 0.1%. If complaints rise, check that everyone opted in and that unsubscribing is easy.
6. Bounce rate
Bounces are emails that couldn't be delivered. Hard bounces (the address doesn't exist) must be removed immediately — your platform should do it automatically. A high bounce rate usually means an old or poor-quality list.
7. List growth rate
New subscribers minus unsubscribes, bounces and complaints, over a month. A list that isn't growing is slowly shrinking, because email addresses naturally go stale.
8. Open rate (with caution)
Opens are now inflated by Apple's Mail Privacy Protection, which loads emails automatically. Use open rate to spot trends and compare subject lines — not as an exact count of readers. More in what is a good open rate.
Metrics you can mostly ignore
- Total list size on its own — engagement matters more than headcount.
- Forward and share counts — interesting, rarely actionable.
- Single-email comparisons with industry averages — your own trend is the better benchmark.
A simple monthly review
Once a month, answer four questions:
- Which email drove the most clicks and conversions — and why?
- Did unsubscribes or complaints spike anywhere?
- Is the list growing?
- What will we do differently next month?
How to calculate each metric (with an example)
Imagine you send a campaign to 2,000 people:
- 40 emails bounce → bounce rate = 40 ÷ 2,000 = 2%
- That leaves 1,960 delivered.
- 90 people click at least one link → click rate = 90 ÷ 1,960 ≈ 4.6%
- 600 "opens" are recorded → open rate ≈ 30.6% (an estimate, because of Apple's privacy features)
- Click-to-open rate = 90 ÷ 600 = 15%
- 6 people unsubscribe → unsubscribe rate ≈ 0.3%
- 1 spam complaint → complaint rate ≈ 0.05%
- 12 orders come from the email → conversion rate = 12 ÷ 1,960 ≈ 0.6%, or 13% of clickers (12 ÷ 90)
From these numbers you'd conclude: bounces are on the edge (clean the list), clicks and conversions are healthy, unsubscribes and complaints are fine.
Track trends, not single campaigns
One campaign can be unusual — a holiday, a great offer, a technical problem. Look at the average of your last five or ten campaigns, and compare month to month. A simple spreadsheet with date, recipients, click rate, unsubscribes and sales for each email is enough to see what's improving.
Connect email to revenue
The most persuasive number is money. Use links with tracking parameters, a discount code that's only shared by email, or your platform's revenue tracking to see how many orders or bookings each email produced. Then compare that with your monthly email costs — see how much email marketing costs.
In Reepio
Every campaign report shows deliveries, opens (clearly marked as estimates), clicks, link-by-link performance, bounces, unsubscribes and complaints, and the Analytics page tracks trends over 7, 30 and 90 days or 12 months. Reepio only shows insights when the data is strong enough to trust. Start free.
Frequently asked questions
What is a good click rate?
It varies widely by industry, list and email type. Use your own average as the benchmark and aim to improve it over time with clearer calls to action and more relevant content.
How do I track sales from email?
Use tracked links with UTM parameters so your website analytics can attribute visits and sales to email, use unique discount codes, or track purchase events in your email platform.
How often should I review my email results?
Glance at each campaign’s results a day or two after sending, and do a deeper review once a month to spot trends and decide what to change.