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Bounce rate is the first health check for any email program. It is the share of messages that could not be delivered and came back instead of reaching an inbox. A rising bounce rate quietly drags down every other number you care about and can put your sender reputation at risk. This calculator turns your bounced count and your send volume into a clear bounce rate and a delivered total.
The formula is bounced emails divided by emails sent, multiplied by 100. Send 5,000 emails and have 45 bounce, and that is 45 divided by 5,000, which is 0.009, times 100, a 0.9 percent bounce rate. The remaining 4,955 were delivered. The lower the percentage, the cleaner your list and the healthier your sending.
This is email deliverability bounce rate, which is different from website bounce rate. Website bounce rate measures visitors who leave after one page. Email bounce rate measures messages that never arrived. The two share a name but describe completely different things.
A hard bounce is permanent, usually a dead or invalid address, and those contacts should be removed at once. A soft bounce is temporary, caused by a full mailbox, a message that is too large or a server that is briefly down, and it may deliver on a later send. This calculator works with your total bounces, so for a deeper diagnosis, split them into hard and soft in your email platform.
Keeping hard bounces near zero protects your sender reputation. Mailbox providers watch how often you hit invalid addresses, and a spike signals a poorly maintained list, which can send even your good mail to spam.
Use a confirmed opt in so bad addresses never enter your list. Remove hard bounces immediately and re-verify addresses that have not engaged in a long time. Run new imports through an email verification service before the first send, and avoid buying lists, which are the single biggest source of bounces and spam complaints.
Most programs should sit comfortably under 2 percent, and under 1 percent is excellent. If your rate is climbing, list hygiene is the fastest fix. We help brands build audiences that actually convert. Request a free audit and we will look at the whole funnel with you.
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