Email open rate and CTR: benchmarks, formulas, how to boost

How to calculate open rate and CTR

Open rate is the share of opened emails out of delivered; CTR is the share of clickers out of delivered. A normal open rate in 2026 is 25–40% depending on industry, and CTR is 2–5%. The formulas are simple, but Apple Mail Privacy Protection inflates open rate, so read it alongside clicks.

Open rate = (unique opens / delivered) × 100%
CTR       = (unique clicks / delivered) × 100%
CTOR      = (unique clicks / unique opens) × 100%

CTOR is the most honest metric

Click-to-open rate shows how many openers actually clicked. It is unaffected by Apple's image preloading and reflects content quality better. A good CTOR is 10–20%.

The Apple MPP caveat

Since 2021 Apple Mail preloads tracking pixels, so those opens count as machine opens, not human ones. iPhone handles a large share of mail, which inflates open rate by 10–30%. Takeaways: don't compare open rate before and after 2021 literally, lean on clicks, CTOR and conversion, and use open rate only as a relative trend between campaigns.

Open rate and CTR benchmarks by industry (2026)

How to lift open rate

Subject line

• 40–50 characters, specifics over fluff: “−30% on sneakers until Friday.”
• Personalize by name and city, but don't overdo it.
• Validate the subject with an A/B test: even reordering words changes opens.
• Avoid all-caps and triple exclamation marks — those are spam triggers.

Preheader

The preheader is the second headline in the inbox list. Don't repeat the subject — extend it: the subject promises, the preheader clarifies the benefit. An empty preheader pulls random text from the email and spoils the impression.

Sender name and send time

A recognizable sender name (“Anna from YourTrend”) gets opened more than a faceless no-reply. Test timing: B2B on Tuesday–Thursday mornings, B2C on evenings and weekends.

How to lift CTR

• One main goal per email and a prominent CTA button with an action verb.
• A contrasting button beats a text link for clicks.
• Segment: a relevant selection is clicked far more than a generic one.
• Mobile layout: half of emails open on a phone.

Deliverability decides first

You can only open an email that reached the inbox. If open rate suddenly drops across the whole list, it's often not the subject but deliverability. Check step by step:

• SPF, DKIM, DMARC configured and passing — without these Gmail and Yahoo throttle you.
• Spam-complaint rate below 0.3%, bounce below 2%.
• Domain warm-up if you send from a new address.
• The email isn't dumped into Promotions from too many images and links.

Trigger words in the subject also hurt inbox placement. Avoid combinations like:

"FREE!!!"  "Guaranteed income"  "Today only $$$"
"No-refusal loan"  "You won"  ALL CAPS everywhere

How to lift CTOR specifically

If people open but don't click, the problem is in the body, not the subject. Remove extra links and keep one main goal, move the CTA above the fold, add a contrasting button, and show the benefit in the first two lines. CTOR often rises simply because you stopped hiding the button in the footer.

Frequently asked questions

Why is a 60% open rate suspicious?

Most likely Apple MPP preloading and corporate mail-security scanners are firing. Look at clicks — they're more honest.

Which day of week is best?

There's no universal answer: test it. On averaged data, Tuesday–Thursday is strong for B2B, and Thursday plus weekends for B2C.

Track open rate, CTR and CTOR, run A/B tests and segments in YourTrend — overview on the features page. Improve deliverability before measuring with the free lab in tools, and check send limits in pricing.

Takeaway

Open rate is useful but distorted by Apple MPP. Look at the open rate + CTR + CTOR + conversion combo, test subjects and preheaders, and segment your list. That's how emails get opened and clicked more often.