Newsletter metrics
Most newsletter creators check their open rate and move on. The creators who grow consistently track five numbers, understand what each one means, and know what to do when any of them drops. This guide covers the five metrics that matter, what healthy benchmarks look like at every list size, and concrete steps for fixing low numbers.
Start your newsletter — free →The 5 metrics that matter
Open rate
The percentage of delivered emails that are opened. Industry average sits at 35-45% for newsletters — meaningfully higher than marketing email because subscribers opted in for the content specifically. An open rate below 25% signals a subject line problem, a deliverability issue, or a mismatch between what you promised and what you send. Above 50% on a list over 1,000 is excellent and indicates a genuinely engaged audience.
Click-through rate (CTR)
The percentage of openers who click at least one link in your email. A healthy range is 2-5%. A low CTR paired with a high open rate is a clear signal: readers are opening but the content is not delivering on the promise of the subject line. Audit your last five issues — are the links obvious, relevant, and positioned near the payoff of each section?
List growth rate
New subscribers minus unsubscribes, divided by total list size, calculated monthly. Healthy newsletters grow at 5-10% per month. A flat or shrinking list means acquisition is not keeping pace with churn. This is the metric that tells you whether your newsletter is building an asset or treading water. If growth has stalled, new acquisition channels are required — not just better content.
Unsubscribe rate
Above 0.5% per send signals a content-audience fit problem. Track this per issue, not just as an overall average. A spike after a specific issue tells you exactly what your readers did not sign up for — a new topic, a different tone, a promotional message. Aggregate unsubscribe data hides these signals; per-issue data reveals them.
Revenue per subscriber
For monetised newsletters, total revenue divided by list size. This ranges from roughly $1 per subscriber per year for ad-supported newsletters to $100 or more per year for paid subscription newsletters with a dedicated niche audience. Revenue per subscriber is the clearest indicator of newsletter business health — it tells you whether your list is an asset or just a vanity number.
Benchmarks by list size
Under 1,000 subscribers
Open rates of 50-70% are common and expected at this stage — your early subscribers are typically your most engaged readers, often people who know you personally or found you through word of mouth. CTR of 5-10% is achievable. Do not optimise aggressively for these numbers yet; focus on publishing consistently and learning what your readers respond to. List growth targets of 10-20% monthly are realistic if you are actively promoting.
1,000 to 10,000 subscribers
This is the growth stage where metrics begin to normalise. Expect open rates of 35-55% if your acquisition has been organic and targeted. CTR of 3-7% is healthy. List growth of 5-10% monthly means you are building momentum. At this stage, unsubscribe rate becomes meaningful — track it per issue. Revenue per subscriber becomes worth calculating if you have any monetisation in place.
10,000+ subscribers
At scale, open rates of 30-45% are strong. Open rates below 25% at this size often indicate deliverability issues or a legacy list with inactive subscribers diluting your numbers. CTR of 2-5% is healthy. List growth of 3-7% monthly sustains a valuable asset. Revenue per subscriber is your most important metric at this stage — the difference between $5 and $20 per subscriber represents a very different business.
What to do with low metrics
Low open rate
Test subject lines — write three options and pick the most specific and curiosity-driven one. Vary your send day and time across three consecutive issues. Clean inactive subscribers who have not opened in 90+ days, as they hurt your sender reputation and drag down your open rate average. Check whether your emails are landing in spam by sending a test to a Gmail address and a personal address on a different provider.
Low click-through rate
Make your links more visible — use descriptive anchor text, not bare URLs. Reduce the number of links per issue to one or two clear calls to action rather than six competing options. Most importantly, audit whether your content delivers on what the subject line promised. A subject line that creates curiosity but an email that does not satisfy it produces readers who open but do not click.
High unsubscribe rate
Survey recent unsubscribers with a one-question exit survey — most email platforms support this. Review the last three issues for tone drift or topic shift. If you have been running paid acquisition (social ads, sponsorships, referral programs), check whether the traffic source is sending readers whose interests do not match your actual content. Mismatched acquisition is the most common cause of sustained high unsubscribe rates.
Slow list growth
Add a signup form to your highest-traffic pages — use your analytics to find the top three pages and put a form on each. Create a lead magnet that your target reader would genuinely want: a checklist, a template, a short guide. Promote your newsletter on whichever social channels your readers already use. Ask existing subscribers to share a specific issue they found useful — a direct referral from a trusted source converts better than any ad.
Common questions
What is a good open rate for a newsletter?
A healthy engaged list sees open rates of 35-50%. Above 50% is excellent, particularly on lists of 1,000 or more subscribers. Below 25% warrants investigation — check your subject lines, your deliverability, and whether your acquisition sources are bringing in well-matched readers.
How often should I check my newsletter metrics?
Check open rate and CTR after every send — most platforms show reliable data within 48-72 hours of sending. Review list growth and unsubscribe trends monthly. Revisit revenue per subscriber quarterly if you have any monetisation in place.
Should I delete inactive subscribers?
Yes. Subscribers who have not opened in 90 or more days hurt your deliverability because inbox providers use engagement signals to decide whether your emails belong in the inbox or spam folder. Send a re-engagement email first — something honest, like asking whether they still want to hear from you. Remove those who do not respond within two weeks.
Which metric matters most?
It depends on your current goal. Open rate is the most important metric for understanding engagement. List growth rate is the most important metric for audience building. Revenue per subscriber is the most important metric for evaluating newsletter business health. Track all five, but focus your optimisation effort on the one that most directly affects your next milestone.
Track what matters. Grow your newsletter.
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