The Email Metrics That Actually Matter (And the Ones You Can Stop Obsessing Over)
Let's have an honest conversation. If you're staring at your Klaviyo dashboard every Monday morning, screenshotting open rates to send to your team, and panicking when one campaign dips below 40%... you're playing the wrong game.
Open rates have been broken since Apple's Mail Privacy Protection rolled out in 2021. Half of what you're celebrating is a bot pre-loading images. And yet entire marketing teams are still building strategy around a number that's basically theater at this point.
So let's clean house. Here's what actually matters in 2024, what you can stop losing sleep over, and how to know if your email program is genuinely working or just looking busy.
The Metrics That Actually Move Revenue
1. Revenue Per Recipient (RPR)
This is the metric. If I could only look at one number to judge an email program, this would be it.
RPR is exactly what it sounds like: total revenue from a campaign divided by how many people you sent it to. It bakes in deliverability, open rates, click rates, conversion rates, and AOV all in one number. You can't fake it. You can't game it.
Solid benchmarks for ecommerce:
$0.10 RPR = decent, you're not embarrassing yourself
$0.15 to $0.25 = you know what you're doing
$0.30+ = you're in the top tier, congrats
Below $0.05 = something's broken, probably your list health or segmentation
Track this on every campaign. Compare similar campaigns to similar campaigns (a Black Friday email isn't fair competition for a Tuesday content drop). Watch the trend line over 90 days.
2. Click-to-Conversion Rate
Open rates are a mess. Click rates are mostly fine, but they only tell you if your subject line and preview text did their job. The real question is: once someone clicks through to your site, do they buy?
If your click-to-conversion rate is healthy (think 8-15% for warm segments, 3-5% for broader sends), your emails are doing their job and your site is too. If clicks are great but conversions are weak, the problem isn't your email. It's your landing page, your offer, your pricing, or your product photography.
This metric saves you from blaming the wrong department.
3. List Growth Rate (Net, Not Gross)
Everyone tracks new subscribers. Almost nobody tracks net growth. Big mistake.
Net growth = new subscribers minus unsubscribes minus suppressed/bounced emails. If you're adding 2,000 subscribers a month but losing 1,800 to unsubs and bounces, you don't have a growing list. You have a leaky bucket with a fancy popup.
Aim for 2-5% net monthly growth if you're an established brand. Less than 1% means your acquisition is barely keeping up with attrition, and your CAC is about to get ugly.
4. Engaged Profiles (Last 30/60/90 Days)
This is the closest thing to a real engagement metric we have left. How many people have actually opened or clicked something in the last 30, 60, or 90 days?
Track these three buckets religiously. Send your best campaigns to your 30-day engaged segment. Use 90-day for broader sends. And anyone past 120 days who hasn't engaged needs a sunset flow yesterday.
5. Flow Revenue as % of Total Email Revenue
If campaigns are doing 80% of your email revenue and flows are doing 20%, you're leaving stupid amounts of money on the table. The brands crushing it have flows generating 30-40% of email revenue on autopilot.
Welcome series, abandoned cart, abandoned checkout, browse abandonment, post-purchase, win-back. If any of these are missing or set up halfway, that's your fastest path to more revenue. Period.
6. Spam Complaint Rate
This is the metric that can quietly destroy your entire program. Keep it under 0.1% (one complaint per 1,000 emails). Above 0.3% and Gmail starts treating you like a guy who slid into someone's DMs uninvited.
Watch this on every send. If a campaign spikes, figure out why immediately. Usually it's because you sent to a cold segment, used a sketchy subject line, or made it hard to unsubscribe.
The Metrics You Can Stop Obsessing Over
Open Rate (As a Standalone Metric)
I'm not saying ignore it entirely. I'm saying stop treating it like the scoreboard. Apple MPP inflates it. Bots inflate it. Image pre-loaders inflate it.
If you're using open rate to gauge subject line performance, fine, but only when comparing similar audiences. If you're using it to judge whether a campaign "worked," you're fooling yourself.
Total Subscriber Count
"We hit 100K subscribers!" Cool. Are they buying? Are they opening? When was the last time half of them did anything?
A list of 30,000 engaged buyers will out-earn a list of 200,000 ghosts every single day. Subscriber count is a vanity metric unless paired with engagement and revenue data. Stop bragging about list size. Start bragging about RPR.
Unsubscribe Rate (Within Reason)
Operators panic when unsubs tick up. Unless you're above 0.5% per campaign consistently, relax. Unsubscribes are actually healthy. You want disengaged people off your list because they're hurting your deliverability and skewing your data.
I'd rather have someone unsubscribe than mark you as spam. The unsubscribe button is a feature, not a bug.
Email Volume Sent
"We sent 12 campaigns this month!" Okay, but did they make money? Volume isn't strategy. I've seen brands send 4 campaigns a month and out-earn brands sending 20. Quality, segmentation, and timing matter way more than how many emails you blasted out.
Click Rate Without Context
A 3% CTR on a sale email is fine. A 3% CTR on a hyper-segmented post-purchase email to your VIPs is terrible. CTR only matters relative to the type of send and audience. Don't benchmark across different campaign types and panic.
How to Actually Use This Stuff
Here's the simple framework I'd build if I were running your email program tomorrow:
Weekly check: RPR per campaign, spam complaint rate, deliverability indicators
Monthly check: Net list growth, flow revenue %, engaged profile counts (30/60/90)
Quarterly check: LTV by acquisition source, list health audit, full flow performance review
Stop opening Klaviyo every morning to check yesterday's open rate. That's an anxiety habit, not a marketing strategy.
The Real Question to Ask Every Week
Forget the dashboard for a second. Ask yourself this: Is email revenue growing as a percentage of total revenue, while my list stays healthy?
If yes, you're winning. The benchmark to aim for is email driving 25-35% of total ecommerce revenue. Less than 20% and you're under-monetizing your list. More than 40% and you might be over-mailing or your other channels need work.
That single question cuts through 90% of the metric noise.
One More Thing
The brands I see growing fastest aren't the ones with the prettiest dashboards. They're the ones who picked 4 or 5 metrics that genuinely correlate to revenue, ignored the rest, and got obsessive about improving those numbers month over month.
You don't need more data. You need better data, looked at less often, with more conviction about what to do about it.
Now go close your Klaviyo tab and actually go build something.
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