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.