Marketing calculators
Email Open Rate Calculator
Calculate unique opens as a share of delivered emails after bounces. Your inputs stay in this browser.
Live calculator
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What this calculator measures
Open rate divides unique opens by estimated delivered emails, which are sent emails minus bounces.
Formula
Open Rate % = Unique Opens / (Emails Sent - Bounces) x 100
Worked example
- 12,000 sends minus 200 bounces gives 1,800 delivered.
- 2360 unique opens / 1,800 x 100 = 20%.
How to interpret the result
Privacy protections and image loading can distort open tracking, so combine it with clicks and downstream outcomes.
Common mistakes and limits
- Using total opens, forgetting bounces, or comparing providers with different tracking behavior.
Frequently asked questions
Why use unique opens?
They reduce repeat opens by the same recipient.
Are opens exact?
No. Client privacy and image handling affect detection.
What if bounces equal sends?
There is no delivered denominator, so the rate is undefined.