Email Open Rate Calculator

Compare unique email opens with successfully delivered messages. Enter your own values below to see open rate and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

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Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Open rate = unique email opens ÷ delivered emails × 100. Count one outcome per eligible unit.

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What is Email Open Rate Calculator?

Email Open Rate Calculator helps you compare unique email opens with successfully delivered messages.

The main result is open rate. The formula, example and assumptions below explain how to interpret it.

How to use Email Open Rate Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather unique email opens and delivered emails. Use values from the same situation or reporting period.
  2. Replace the example unique email opens with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read open rate. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter unique email opens, at least 0. Decimals are accepted.
  • Enter delivered emails, at least 0.001. Decimals are accepted.

Email Open Rate Calculator: a worked example

With the inputs below, the result is 5 % (open rate). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Unique email opens50
Delivered emails1,000
Open rate5 %

Understanding the Email Open Rate result

The main output is open rate, expressed in %. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Email Open Rate Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending.

For wider guidance, visit Google Ads Help. The formula and scope of this specific tool are stated on this page.

Email Open Rate Calculator FAQs

What does Email Open Rate Calculator calculate?

Email Open Rate Calculator helps you compare unique email opens with successfully delivered messages. Its main output is open rate in %.

What inputs do I need for Email Open Rate Calculator?

You need unique email opens and delivered emails. Use the field labels and units to match your figures to the formula.

Which formula does Email Open Rate Calculator use?

Open rate = unique email opens ÷ delivered emails × 100. Count one outcome per eligible unit.

What is a worked example for Email Open Rate Calculator?

Example inputs: Unique email opens: 50; Delivered emails: 1,000. The result is 5 % (open rate).

How should I enter unique email opens?

Enter unique email opens, at least 0. Decimals are accepted.

How do I choose delivered emails?

Enter delivered emails, at least 0.001. Decimals are accepted. The example uses 1,000; replace it if your circumstances differ.

How should I read open rate?

The main output is open rate, expressed in %. It applies to the inputs and operation you selected.

Why might my Email Open Rate Calculator result differ from my records?

Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Email Open Rate Calculator?

Yes. Note your first open rate, change unique email opens or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Email Open Rate Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.