FREE EMAIL ENGAGEMENT CALCULATOR
Calculate email CTR and CTOR correctly
Enter delivered emails, unique opens and unique clicks to calculate click-through rate (CTR), click-to-open rate (CTOR), and open rate with the correct denominator for each metric.
Campaign numbers
YOUR RESULTS
Click-through rate (CTR)
CTR uses delivered emails; CTOR uses unique opens. Keep those denominators separate when comparing reports.
METRIC DEFINITIONS
CTR vs CTOR: what is the difference?
CTR
The percentage of delivered recipients who clicked. It reflects overall click engagement across the delivered audience.
CTOR
The percentage of tracked unique openers who clicked. It focuses on the relationship between opens and clicks.
Open rate
Unique opens divided by delivered emails. Privacy features and automated activity can make opens less reliable than they appear.
CTOR = Unique clicks ÷ Unique opens × 100
HOW TO USE IT
Use unique counts from the same campaign
Take delivered, unique opens, and unique clicks from the same ESP report and reporting window. Do not mix total clicks with unique opens. A recipient clicking several links can create multiple click events but should still count once when calculating unique-recipient CTR or CTOR.
INTERPRETATION
What can CTR and CTOR help diagnose?
Low CTR + low CTOR
Review audience relevance, offer, body copy, CTA clarity, link placement and landing-page promise.
Low CTR + stronger CTOR
The content may work for people who open, while subject-line relevance, deliverability, or audience selection deserves investigation.
Strong clicks but weak conversion
The problem may sit after the email: landing page, checkout, offer-message match, or conversion tracking.
IMPROVEMENT
How to improve email click performance
Segment around real subscriber intent, make one primary action obvious, align the subject line with the email promise, reduce competing links, write descriptive CTA copy, test layout on mobile, and evaluate the landing page together with the email. Compare like-for-like campaigns over time instead of chasing a universal benchmark.
WORKED EXAMPLE
CTR and CTOR calculation example
Suppose an email reaches 10,000 recipients, records 2,500 unique opens and 500 unique clicks. CTR is 500 ÷ 10,000 × 100 = 5%. CTOR is 500 ÷ 2,500 × 100 = 20%. Open rate is 25%. The percentages differ because each answers a different question.
Always check an ESP’s metric definition before comparing platforms or reports. Confirm whether the numerator is unique or total activity and whether the denominator is sent, delivered or opened recipients.
MEASUREMENT GUIDE
Unique clicks, total clicks and conversion
Unique clicks count recipients who clicked at least once. Total clicks count click events, so one subscriber can contribute several. Recipient-level CTR and CTOR are clearest when they use unique clicks.
A click is still not a conversion. Evaluate click metrics alongside the action that matters after the click—purchase, signup, booking or another defined outcome.
BENCHMARK CONTEXT
How should you benchmark CTR and CTOR?
Promotions, newsletters, onboarding and re-engagement emails attract different intent, so a single universal benchmark can mislead. Build an internal baseline by comparing the same campaign type, similar audience and similar offer over time.
Questions to ask when click rates change
- Did the audience or segment change?
- Did deliverability change?
- Was the primary CTA easier to understand?
- Did the offer match the subject-line promise?
- Could automated security scanning affect clicks?
- Did conversions move with clicks?
FAQ
CTR and CTOR questions
What is a good email CTR?
There is no universal rate. Industry, campaign type, audience intent and measurement method differ. Compare similar campaigns and track your own trend.
Can CTOR exceed 100%?
It should not when both inputs use compatible unique-recipient counts. A value over 100% usually signals mismatched definitions or tracking data.
Is CTOR more important than CTR?
They answer different questions. CTR uses the delivered audience; CTOR conditions clicks on tracked opens. Conversions and revenue may be more important for business outcomes.
Why can open tracking distort CTOR?
Privacy and automated loading can inflate the open denominator, which can change reported CTOR even when human behavior did not change proportionally.
Related GrowthBrief tools
Email ROI Calculator · Email Revenue Calculator · Email Marketing Metrics