What is an email open rate?
An email open rate is the percentage of delivered emails that subscribers open. It's the first gate every send has to clear: if a subscriber never opens, the offer, the design, and the copy inside never get seen.
It's also a noisier signal than it used to be. Privacy features in some email clients can inflate open counts by loading images automatically, so read open rate alongside click-to-open rate and clicks to see what's really happening. And what a marketer would consider a "good" open rate varies by industry, so a beauty brand and a home-goods brand shouldn't chase the same number.
Why email open rates matter
Inboxes get more crowded every year, and it's easy to blame the noise and move on. But the levers that move opens are ones you actually control: subject lines, send timing, list quality, and segmentation.
A few of the benefits of working those levers:
- More from the sends you already pay for: higher opens raise revenue without more list growth or more budget.
- Faster learning: subject line and content tests resolve quicker when more people see them.
- A clearer read on content: when opens are healthy, click and conversion numbers tell you about the email itself, not the subject line.
Why choose Klaviyo to improve open rates
Subject lines, timing, and list quality only work together when they read from the same data. Klaviyo is the autonomous B2C CRM, so the subject line, the send time, and the audience all draw on one real-time profile of what each subscriber actually does.
Subject lines that earn the open
Generic promotional lines get ignored, and relevance is the fix. Subject Line AI drafts variations tied to what you're actually sending, and the preheader gets treated as part of the pitch rather than an afterthought. Pushy phrasing like all caps or stacked exclamation marks trips spam filters and reader distrust in equal measure.
Timing read from each subscriber's behaviour
A single send time treats a 6 a.m. inbox checker and a late-night browser exactly the same, so one of them always gets your email at the wrong moment. Smart Send Time learns from past engagement to deliver when each subscriber is most likely to be in the inbox.
A list that actually reaches the inbox
Mailing people who stopped opening months ago drags down inbox placement for everyone, including the subscribers who want to hear from you. Klaviyo's segmentation isolates unengaged profiles before they hurt you, and Guided Warming builds sender reputation as your list and volume grow.
Key features that lift open rates in Klaviyo
Feature | Description | Available with Klaviyo |
|---|---|---|
Subject Line AI | Drafts subject line options so every campaign has variations to test | ✅ |
A/B testing | Splits a campaign between two subject lines and reports the winner | ✅ |
Smart Send Time | AI-powered send time optimisation built into campaigns | ✅ |
Real-time segmentation | Audiences build on any data point, from any source, and update as behaviour changes | ✅ |
Guided Warming | Ramps sending volume gradually on new or growing sending infrastructure | ✅ |
How to get started with Klaviyo
To start lifting your open rates in Klaviyo:
- Benchmark where you stand. Compare your rates against your industry in Klaviyo's 2025 email marketing benchmarks by industry (EN) before deciding which lever to pull first.
- Test subject lines on every campaign. Pick your two strongest lines and let real opens decide the winner.
- Turn on Smart Send Time. Let send timing adapt to your subscribers instead of one scheduled hour for the whole list.
- Sunset your silent subscribers. Give lapsed profiles one win-back series, then suppress the ones that stay quiet.
- Automate your highest-intent sends. Triggered flows like abandoned cart arrive while attention is already on your brand, which is why they out-open scheduled campaigns.
Brands on Klaviyo see an average of 63x ROI on email, and the open is where that return starts. Ready to get more of every send seen? Get started with Klaviyo today.