General calculator
Email open rate calculator
Open rate ≈ opens ÷ delivered sends × 100. Use platform-reported definitions.
Inputs
Enter valid numbers. Calculations run entirely in your browser.
Results
Open rate (%)
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Example
1,840 opens on 20,000 delivered → 9.2%.
Explanation
Image blocking and Apple MPP affect measured opens—trend more than absolute.
FAQ
Unique vs total opens?
This ratio is unique opens by convention for comparability.