Free online bounce rate calculator. Calculate bounce rate, bounced emails, or total emails sent for your email campaigns. Compare against industry benchmarks. Pure client-side, no ads.
Email Bounce Rate measures the percentage of sent emails that could not be delivered to the recipient's inbox. A high bounce rate can damage your sender reputation and affect deliverability. This calculator helps you quickly compute bounce rate, required bounced emails, or required send volume — whichever two values you know. All calculations happen entirely in your browser — no data is ever sent to a server.
Email Bounce Rate is the percentage of sent emails that were returned undeliverable. The formula is: Bounce Rate = (Bounced Emails / Total Emails Sent) × 100. For example, if you sent 5,000 emails and 150 bounced, your bounce rate is 3%. Bounces are categorized as hard bounces (permanent failures like invalid addresses) and soft bounces (temporary issues like full mailboxes).
A good bounce rate is under 2%. Rates between 2-5% are acceptable, 5-10% is average, 10-15% is poor, and above 15% is critical. Hard bounces above 2% indicate a list hygiene problem. Most email service providers recommend keeping your overall bounce rate below 5% to maintain good sender reputation.
To reduce bounce rate: use double opt-in to verify email addresses, regularly clean your email list by removing hard bounces, avoid purchasing email lists, use email verification tools before sending, monitor bounce reports after each campaign, segment inactive subscribers, and maintain consistent sending patterns to build sender reputation.
A hard bounce occurs when an email is permanently undeliverable (invalid address, domain doesn't exist, recipient unknown). These should be removed from your list immediately. A soft bounce is temporary (mailbox full, server down, message too large). Soft bounces may be retried but should be monitored — if an address soft bounces repeatedly, treat it as a hard bounce.