Spam complaint rate calculator.
Work out your spam complaint rate in seconds. Enter how many complaints you got and how many emails were delivered, and see the rate plus whether it's under Google's 0.1% target, worth watching, or past the 0.3% ceiling. Runs right here in your browser.
Bands: under 0.1% healthy, 0.1-0.3% worth watching, over 0.3% risky. The 0.1% target and 0.3% ceiling are Google's published guidance - one send over the line is a warning, a sustained rate over it is what gets mail filtered or blocked.
How the complaint rate is calculated
The formula is simple: (complaints ÷ delivered) × 100. Deliver 10,000 emails, get 12 complaints, and your rate is 0.12%. Mailbox providers watch this number closely because a “report spam” click is the strongest signal that people don't want your mail, so the thresholds are far tighter than for bounces. See what a spam complaint rate is for the full picture.
- Under 0.1%: healthy
- Below Google's target, where a careful, opted-in sender should sit.
- 0.1-0.3%: worth watching
- In the warning band. Make your one-click unsubscribe obvious so people opt out instead of reporting spam.
- Over 0.3%: risky
- Past Google's ceiling, high enough to get mail filtered or blocked. Set up feedback loops so you can suppress complainers fast.
Spam complaint rate calculator FAQ
Fewer complaints start with a clean list
Verify your list to remove the stale, unengaged addresses that complain most. Start free with 100 credits, no card required.