THE NUMBERS, EXPLAINED
How to use this calculator.
Open tracking can be distorted by privacy features. Bounce rate here uses delivered plus bounced as the sent count.
Start with your inputs
Enter delivered emails, unique opens, unique clicks, bounces. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Delivered emails | 1000 |
| Unique opens | 400 |
| Unique clicks | 100 |
| Bounces | 20 |
A worked example
With the example inputs above, open rate (%) is 40. Change the inputs to explore your own scenario.
Putting the example numbers into the formula
Open rate (%)
(400) ÷ (1000) × 100 = 40
Click rate (%)
(100) ÷ (1000) × 100 = 10
Bounce share of sent (%)
(20) ÷ ((1000)+(20)) × 100 = 1.960784
| Result | Example answer |
|---|---|
| Open rate (%) | 40 |
| Click rate (%) | 10 |
| Bounce share of sent (%) | 1.960784 |
How this is calculated
Open rate (%)
b ÷ a × 100
Click rate (%)
c ÷ a × 100
Bounce share of sent (%)
d ÷ (a+d) × 100
Symbols and units
- a
- Delivered emails
- b
- Unique opens
- c
- Unique clicks
- d
- Bounces
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Open tracking can be distorted by privacy features. Bounce rate here uses delivered plus bounced as the sent count.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Open rate (%); Click rate (%); Bounce share of sent (%). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Open tracking can be distorted by privacy features. Bounce rate here uses delivered plus bounced as the sent count.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →