Bounce rate calculator.
Work out your email bounce rate in seconds. Enter how many emails you sent and how many bounced, and see the rate plus whether it's healthy, worth watching, or a problem. Runs right here in your browser.
Bands: under 2% healthy, 2–5% worth watching, over 5% risky. These are rules of thumb, not hard lines — the number that matters is your own rate over time, not a single send against an industry average.
How the bounce rate is calculated
The formula is simple: (bounces ÷ sent) × 100. Send 10,000 emails, have 233 bounce, and your rate is 2.33%, right at the cross-industry average. What matters more than any single send is the trend, and whether your hard bounces (the permanent failures) are near zero, since those are the ones that damage your sender reputation.
- Under 2%: healthy
- In the range mailbox providers expect from a careful sender.
- 2-5%: worth watching
- Around or above the industry average. Clean your list before the next send. See the bounce rate benchmarks for how your industry compares.
- Over 5%: risky
- High enough to risk throttling or filtering. See why bounce rate matters.
Bounce rate calculator FAQ
Lower your bounce rate at the source
Verify your list to remove the dead addresses that cause hard bounces before you send. Start free with 100 credits, no card required.