Email & Lifecycle
Email Deliverability Rate Calculator
Delivered is not the same as seen. This separates the two: your delivery rate tells you what the receiving servers accepted, and an inbox placement estimate tells you roughly how much of that landed somewhere a human will look.
Result
FormulaDelivery rate = ((sent - bounces) ÷ sent) × 100. Inbox estimate = delivered × inbox placement share
Worked example
45,000 sent with 900 bounces is a 98 percent delivery rate and a 2 percent bounce rate. 45 complaints against 44,100 delivered is a 0.102 percent complaint rate, and at 87 percent measured placement roughly 38,367 emails actually reached an inbox.
What to watch for
Keep bounce rate under 2 percent and complaint rate under 0.1 percent. Google and Microsoft both treat 0.3 percent complaints as a hard ceiling, and crossing it moves your mail to spam faster than any content change.
Delivery rate near 99 percent while engagement collapses almost always means promotions tab or spam folder placement. The servers accepted your mail, they just filed it where nobody reads.
Authentication is table stakes now: SPF, DKIM, and a DMARC policy on the sending domain. Bulk senders without all three get throttled regardless of how good the content is.
Frequently asked questions
What is the difference between delivery rate and inbox placement?
Delivery rate is what the receiving mail server accepted. Inbox placement is where it put the message. You can have 99 percent delivery and 60 percent inbox placement at the same time, and only the second number affects revenue.
How do I fix a rising bounce rate?
Stop importing purchased or scraped lists, add double opt-in on your highest volume forms, run a validation pass on addresses older than a year, and suppress anything that hard bounced once. Never retry a hard bounce.
Do I need to warm up a new sending domain?
Yes. Start with your most engaged segment and grow volume over two to four weeks. Blasting a full list from a cold domain is the single most common way teams destroy a sender reputation on day one.
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This calculator runs entirely in your browser. Nothing you enter is sent to a server, logged, or stored. Figures are for planning and do not constitute financial advice. See disclosures.