Open rate flatters you.CTOR tells the truth.
Open rate measures the subject line. Click rate measures the whole send. Click-to-open rate measures the only thing you actually control once they're inside: whether the email earned the click. This calculator runs all four at once so you stop guessing which half is broken.
Your numbers
Sends that landed in an inbox (sent minus bounces).
Distinct people who opened, not total opens. Use unique to avoid inflating.
Distinct people who clicked any link in the email.
People who completed the goal after clicking (purchase, signup, booking).
The verdict
Click-to-open (CTOR)
14.5%
Open rate
22.0%
Click rate (CTR)
3.2%
Click → conversion
12.5%
Share of clickers who completed the goal.
Where the audience drops off
CTOR vs the benchmark
CTOR strips out the subject-line effect, so it's the fairest cross-campaign comparison you have. Most senders should clear 12%; the best beat 20%.
Reverse-solve · hit a target CTOR
Clicks needed
330
Short by
10
On your 2,200 opens, a 15.0% CTOR target needs 330 clicks — 10 more than the 320 you have now. Note that this leaves opens fixed: the fastest way to more clicks is a sharper email, not a louder subject line.
Sensitivity · what CTOR buys you
More clicks, same open count
| CTOR | Clicks | Conversions at current rate |
|---|---|---|
| 6.0% | 132 | 17 |
| 8.0% | 176 | 22 |
| 10.0% | 220 | 28 |
| 12.0% | 264 | 33 |
| 14.0% | 308 | 39 |
| 16.0% | 352 | 44 |
| 20.0% | 440 | 55 |
Holding your 2,200 opens and 12.5% click-to-conversion rate steady, every point of CTOR you win turns straight into clicks and conversions. That's why the email body — not the subject line — is usually the highest-leverage thing to fix.
Your move
You've got the rates. I find the revenue hiding in them.
CTOR 14.5% (open 22.0%, click 3.2%) across 10,000 delivered.
Send me one campaign report. In the first 30 minutes I'll tell you whether the leak is the subject line, the email, the page, or the list, and the one change I'd ship first. Free, and the read is yours whether you hire me or not.
Plain English
CTOR is the metric the inbox can't fake
Click-to-open rate (CTOR) is the percentage of people who opened your email and then clicked something in it. Where open rate judges the subject line and the sender name, CTOR judges the email itself: the copy, the offer, the design, the call to action. It's the cleanest read you get on whether the message inside was worth opening.
It matters more than open rate ever has, especially now. Apple Mail Privacy Protection and other prefetchers fire opens whether or not a human looked at the email, so open rate is inflated and increasingly meaningless. A click is a deliberate act a bot won't fake. CTOR, built on top of opens, isolates engagement quality among people who chose to look.
This calculator gives you the full funnel in one shot: open rate (delivered to opens), click rate (delivered to clicks), CTOR (opens to clicks), and click-to-conversion (clicks to the goal). Reading them together tells you exactly where the send leaks: subject line, body, or landing page. A great open rate with a weak CTOR is a subject line writing a check the email can't cash.
The formula
CTOR = Unique Clicks ÷ Unique Opens × 100
Deliver 10,000, get 2,200 opens and 320 clicks → open rate 22%, click rate 3.2%, and CTOR 320 ÷ 2,200 = 14.5%. So nearly one in seven openers clicked: the email earned its open. If clicks were only 130, the same 22% open rate would hide a 5.9% CTOR — the subject line worked, the email didn't.
What good looks like
Email benchmarks swing hard by industry, list quality, and how you count opens, but the ranges below are the ones most senders should measure themselves against. CTOR is the one to obsess over: it's the least gameable of the three.
| Metric | Typical range |
|---|---|
| Open rate | 20-40% (inflated post-Apple MPP) |
| Click rate (CTR) | 2-5% |
| Click-to-open (CTOR) | 10-15% |
Source: Email engagement benchmarks (Mailchimp / Campaign Monitor) · 2025
Your numbers came back soft. Where's the leak?
High open rate, low CTOR (under ~8%).
The subject line oversold what the email delivered. The promise got the open; the body didn't pay it off. Tighten the offer, cut to one clear CTA above the fold, and make the click the obvious next step.
Low open rate, decent CTOR.
The email is fine — barely anyone's seeing it. This is a subject line, sender name, send time, or deliverability problem. Warm the domain, clean the list, and A/B test subject lines before you touch the body.
Strong CTOR, weak click-to-conversion.
People click and then bail. The leak is past the email: a slow or mismatched landing page, a broken mobile flow, or a promise the page doesn't keep. Fix the page the link points to, not the email.
Everything low across the board.
List health, not copy. You're likely emailing unengaged or stale contacts. Sunset the dead weight, re-permission the cold segment, and CTOR will rise the moment you stop mailing people who left.
Eight ways to lift CTOR
01One email, one job
Multiple competing CTAs split attention and sink CTOR. Pick the single most valuable click and design the whole email around it.
02Make the CTA a button
Bulletproof, thumb-sized buttons out-click text links every time. Put the primary one above the fold and repeat it once at the bottom.
03Match subject to body
When the subject promises a thing, the email must deliver that thing in the first two lines. Mismatch is the number-one CTOR killer.
04Segment before you send
A relevant email to 5,000 the right people beats a generic one to 50,000. Behavioral and lifecycle segments routinely double CTOR.
05Cut the word count
Most emails are too long. Get to the link faster. Skimmable copy with clear hierarchy gets the click before attention runs out.
06Design for dark mode and mobile
Over half of opens are mobile, many in dark mode. If your CTA disappears or breaks, the click never happens. Test on a real phone.
07Use a real, human from-name
A person's name beats a brand alias for both opens and trust, which carries into the click. People click people.
08Sunset the unengaged
Removing contacts who haven't opened in 90+ days lifts every rate at once and protects deliverability so the email reaches engaged inboxes.
The vocabulary
- CTOR
- Click-to-open rate: unique clicks ÷ unique opens. The share of openers who clicked. The cleanest measure of email content quality.
- Open rate
- Unique opens ÷ delivered. Measures the subject line and sender, but inflated by privacy prefetchers like Apple MPP.
- Click rate (CTR)
- Unique clicks ÷ delivered. The whole-send click rate; a blend of open rate and CTOR.
- Delivered
- Emails that reached an inbox: sends minus hard and soft bounces. The honest denominator for open and click rates.
- Unique vs total
- Unique counts each person once; total counts every action. Always rate on unique to avoid inflating a few power-clickers into a trend.
- Click-to-conversion
- Conversions ÷ clicks. How many clickers completed the goal. Isolates the landing page from the email.
CTOR questions, straight answers
For most senders a healthy CTOR is 10-15%, with strong campaigns pushing above 20%. Below about 6% the email content is underperforming, even if the subject line is pulling opens. It varies by industry, but because CTOR strips out the subject-line effect, it's far more comparable across senders than open rate.
Keep going
A calculator tells you what. A call tells you what to do about it.
Send me the account behind these numbers. I'll tell you straight where the money's leaking and what I'd fix first — free, and you keep it whether you hire me or not.