ToolGrid AIEmail Open Rate Calculator
Calculate reported unique opens as a percentage of delivered messages.
Runs entirely in your browser — your selected files are not uploaded by this tool. Device-provided speech voices may use online services.
About this free email open rate calculator tool
Calculate reported unique opens as a percentage of delivered messages. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
A practical example
A concrete example uses delivered messages: 800; reported unique opens: 200. The result is Open rate (%): 25.
Before you rely on the result
Arithmetic using your values; no live rates or legal rules. Uses floating-point numbers rounded to six decimals; keep consistent units. Privacy features can inflate reported opens; this is not a measure of actual readership.
Frequently asked questions
Is the email open rate calculator free to use?
Yes. The Email Open Rate Calculator is free, needs no account and has no usage limit beyond what your device can handle.
Are my files or numbers uploaded anywhere?
No. The Email Open Rate Calculator runs in your browser, so the values and files you enter stay on your device. Close the tab and nothing is kept.
What does the email open rate calculator do?
Calculate reported unique opens as a percentage of delivered messages. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
When should I double-check the result?
Arithmetic using your values; no live rates or legal rules. Uses floating-point numbers rounded to six decimals; keep consistent units. Privacy features can inflate reported opens; this is not a measure of actual readership.
Can I share my result?
Yes. Use Copy result or Download, and on calculator-style tools use Copy share link to send someone a link that opens with the same inputs filled in.