01
Email open rate formula
Divide unique opens by delivered emails and multiply by 100.
CalculatorsFREE · NO SIGNUP
Email Open Rate Calculator
Calculate unique email open rate from unique opens and delivered messages while keeping tracking limitations visible.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Measure opens on a delivered-message basis.
LIVE RESULT
Unique open rate
30.00%Recorded open signals can be affected by privacy and image-loading behavior.UNIQUE OPENS3,600
DELIVERED EMAILS12,000
TARGET RATE25.00%
OPENS AT TARGET3,000
ADDITIONAL OPENS0
DENOMINATORDELIVERED EMAILS
13
A SIGNAL, NOT A PERSON
Open tracking is an instrumented estimate
Privacy protection and image loading can inflate or suppress recorded opens. Preserve the arithmetic, then read it beside clicks and conversions.
WORKING VIEW
30.00% OPEN RATE3,600 OPENS · 12,000 DELIVERED
METHODunique opens ÷ delivered emails × 100
WORKING NOTEUnique opens ÷ delivered emails
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
3,600 OPENS · 12,000 DELIVERED30.00% OPEN RATE
Unique opens ÷ delivered emails
02
Use delivered emails
Delivered messages usually equal sent messages minus bounces.
03
Account for privacy effects
Automatic image loading and privacy features can affect recorded opens.
04
Avoid invented benchmarks
Audience, cadence, sender reputation, subject, and tracking setup change comparisons.
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Email open rate formula
Divide unique opens by delivered emails and multiply by 100.
For response beyond the tracking pixel, compare the result with the CTR calculator and downstream conversion data.
Use delivered emails
Delivered messages usually equal sent messages minus bounces.
Keep unique opens and delivered count in the same campaign and reporting window.
Account for privacy effects
Automatic image loading and privacy features can affect recorded opens.
Do not interpret the metric as a precise count of people who read the message.
Avoid invented benchmarks
Audience, cadence, sender reputation, subject, and tracking setup change comparisons.
The calculator reports arithmetic and does not label a rate good or bad.
Questions, answered.
How do you calculate email open rate?
Divide unique opens by delivered emails and multiply by 100.
Why use delivered emails?
Bounced messages could not open, so the delivered count is the relevant denominator.
Are open rates exact?
No. Privacy features and image loading can affect the recorded open signal.
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