CPM Calculator
Work out cost per 1,000 impressions from spend and impressions.
Email Open Rate Calculator
Work out email open rate from unique opens and emails delivered.
Open rate
—
Delivery rate—
Emails bounced—
Quick Tool Overview
The Email Open Rate Calculator turns unique opens and emails delivered into an open rate instantly, and adds delivery rate and bounce count when you enter how many emails were sent.
- What it does
- Calculates email open rate against emails delivered
- You give it
- Unique opens, emails delivered, and optionally emails sent
- You get back
- Open rate %, delivery rate, and bounce count
- Best for
- Checking subject line and sender performance across campaigns
About the Email Open Rate Calculator
Open rate is the first checkpoint in an email campaign: it tells you whether the subject line, the sender name and the send time did their job before anything else in the email got a chance.
Enter unique opens and emails delivered to get the open rate instantly. Add the number of emails sent and the calculator also works out the delivery rate and how many messages bounced — a list-health problem that quietly drags every other metric down. The note underneath explains why post-2021 open rates should be read with care.
Key features of the Email Open Rate Calculator
Instant results
The open rate updates live as any figure changes.
List health included
Add emails sent to see delivery rate and how many bounced.
Honest about accuracy
Explains how privacy features inflate modern open rates.
Runs in your browser
No sign-up, no data sent anywhere.
How to use the Email Open Rate Calculator
-
1
Enter unique opens
Unique opens, not total opens, so repeat views are not double-counted.
-
2
Enter emails delivered
Messages that reached an inbox — sends minus bounces.
-
3
Add emails sent
Optional — adds delivery rate and bounce count to the result.
-
4
Read the open rate
Updates instantly, with the formula shown underneath.
Frequently asked questions
Open rate = Unique opens ÷ Emails delivered × 100. 2,450 opens on 10,000 delivered is an open rate of 24.5%.
Delivered. Using sends counts bounced messages as unopened and understates the rate — every major email platform reports open rate against delivered for that reason.
Most industry reports put typical open rates somewhere in the high teens to high twenties, with big swings by sector and list quality. Your own trend line over several campaigns is far more useful than any published average.
Less than they used to be. Apple Mail Privacy Protection and similar features pre-load tracking pixels, registering opens that never happened, which inflates the figure. Treat open rate as a directional signal and lean on click rate for real engagement.
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