Email Bounce Rate Calculator: Bounced Emails as a Share of Sent
Work out your email bounce rate from bounced and sent emails — the email-marketing deliverability metric that signals list health and protects your sender reputation, with the delivered share alongside.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Bounce rate | Delivered |
|---|---|---|
| 30 of 2,000 (1.5%) | 1.50% | 98.50% |
| 10 of 5,000 (0.2%, clean list) | 0.20% | 99.80% |
| 150 of 2,000 (7.5%, problem list) | 7.50% | 92.50% |
| 40 of 1,000 (4%) | 4.00% | 96.00% |
How This Calculator Works
Enter the number of bounced emails and the total sent. The calculator divides one by the other and multiplies by 100 to give the bounce rate, with the successfully delivered share alongside. Note that bounces split into two types — hard (permanent) and soft (temporary) — which you handle differently.
The Formula
Part as a Percentage of a Whole
Part is the portion, Whole is the total it belongs to
Worked Example
30 bounced out of 2,000 sent is a 1.5% bounce rate, with 98.5% delivered. Email bounce rate is distinct from website bounce rate (an analytics metric); here it measures deliverability — the share of emails that couldn't be delivered. A low bounce rate is healthy; many marketers aim to keep it under about 2%. A rising or high bounce rate hurts your sender reputation and can land future emails in spam folders, so it's a metric to watch closely and act on.
Key Insight
Email bounce rate is a key signal of list health and a guardian of deliverability, because mailbox providers judge senders partly by how many messages bounce. The crucial distinction is hard versus soft bounces. Hard bounces are permanent failures — invalid, nonexistent, or closed addresses — and should be removed from your list immediately; repeatedly emailing addresses that hard-bounce damages your sender reputation fast. Soft bounces are temporary — a full inbox, a server down, an oversized message — and may deliver on a retry, so they're monitored rather than purged, though an address that soft-bounces repeatedly should eventually be removed. A high or rising bounce rate (commonly a concern above ~2%) signals problems: an old or poorly-sourced list, no email verification at signup, or a purchased list (a major red flag that often bounces heavily and triggers spam complaints). The fixes: use double opt-in to verify addresses at signup, run periodic list cleaning/verification to remove invalid addresses, never buy lists, and promptly remove hard bounces. Pair bounce rate with spam-complaint rate and engagement (opens/clicks) for the full deliverability picture — keeping bounces low protects your ability to reach the inbox at all, which underpins every other email metric.
Frequently Asked Questions
How is email bounce rate calculated?
Divide bounced emails by emails sent, then multiply by 100. 30 bounced out of 2,000 sent is a 1.5% bounce rate, with 98.5% delivered.
What's the difference between hard and soft bounces?
Hard bounces are permanent failures (invalid, nonexistent, or closed addresses) and should be removed from your list immediately. Soft bounces are temporary (full inbox, server down, oversized message) and may deliver on retry — monitor them, but remove addresses that soft-bounce repeatedly.
What's a good email bounce rate?
Lower is better; many marketers aim to keep it under about 2%. A rising or high bounce rate signals list-health problems and hurts your sender reputation, which can push future emails into spam folders. Watch it closely and act when it climbs.
Why does bounce rate matter so much?
Mailbox providers judge senders partly by bounce rates. A high rate damages your sender reputation and deliverability, meaning even your good emails are more likely to be filtered to spam. Keeping bounces low protects your ability to reach the inbox — the foundation of every other email metric.
How do I reduce my bounce rate?
Use double opt-in to verify addresses at signup, run periodic list cleaning/verification to remove invalid addresses, promptly remove hard bounces, and never buy email lists (purchased lists bounce heavily and trigger spam complaints). Pair bounce rate with spam-complaint and engagement metrics for the full deliverability picture.
Related Calculators
Methodology & Review
The bounce rate is bounced emails divided by emails sent, multiplied by 100. The complement is the delivered share. It measures email-campaign deliverability and does not separate hard bounces (permanent failures) from soft bounces (temporary), which differ in how to handle them.
Written by Ugo Candido · Last updated May 22, 2026.