Email Deliverability Calculator
Calculate your email deliverability health — delivery rate, bounce rate, and spam complaint rate — with instant indicators.
Enter Your Campaign Data
Permanent address failures
Temporary delivery failures
Recipients who marked your email as spam
Your Deliverability Health
Delivery Rate
Delivered ÷ Sent
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Hard Bounce Rate
Hard Bounces ÷ Sent
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Soft Bounce Rate
Soft Bounces ÷ Sent
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Total Bounce Rate
All Bounces ÷ Sent
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Spam Complaint Rate
Complaints ÷ Sent
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Deliverability Benchmarks
| Metric | Good | Monitor | Critical |
|---|---|---|---|
| Delivery Rate | ≥ 98% | 95–98% | < 95% |
| Hard Bounce Rate | < 0.5% | 0.5–2% | > 2% |
| Soft Bounce Rate | < 1% | 1–5% | > 5% |
| Total Bounce Rate | < 2% | 2–5% | > 5% |
| Spam Complaint Rate | < 0.1% | 0.1–0.3% | > 0.3% |
How Deliverability Rates are Calculated
Delivery Rate = (Delivered ÷ Sent) × 100
Hard Bounce Rate = (Hard Bounces ÷ Sent) × 100
Soft Bounce Rate = (Soft Bounces ÷ Sent) × 100
Total Bounce Rate = ((Hard + Soft Bounces) ÷ Sent) × 100
Spam Complaint Rate = (Spam Complaints ÷ Sent) × 100
Email Deliverability: What the Numbers Really Mean
Deliverability is the foundation everything else in email marketing is built on. Even the most compelling subject line and perfectly crafted email body are worthless if the message never reaches the inbox. Delivery rate — the percentage of sent emails that were accepted by the receiving mail server — is your first signal of sending infrastructure health. A delivery rate below 97% should prompt an investigation into bounce types, list quality, and domain or IP reputation.
Hard bounces are permanent delivery failures caused by invalid, deactivated, or non-existent email addresses. Major inbox providers like Gmail and Microsoft treat senders with high hard bounce rates as low quality, which can lead to throttling or bulk folder placement across your entire sending volume — not just the bounced addresses. Most email service providers recommend keeping your hard bounce rate below 2%. If it regularly exceeds that threshold, your list acquisition or validation process needs attention.
Spam Complaints and Sender Reputation
Spam complaint rate is the most sensitive deliverability metric. A rate above 0.1% — just one complaint per 1,000 sends — is enough to trigger warnings from Gmail Postmaster Tools and can begin to impact inbox placement at scale. Complaints spike when subscribers forget they opted in, when sending frequency increases sharply, or when content feels irrelevant to the audience. Easy-to-find unsubscribe links, clear sender identification, and preference centres all reduce complaint rates by giving disengaged readers a legitimate exit path.
Monitoring Deliverability Over Time
Deliverability problems rarely appear suddenly — they develop gradually as marginal issues compound. A bounce rate creeping upward by 0.2% each month, or complaint rate drifting from 0.05% to 0.08%, are early warning signs that require action before they escalate. Tracking these numbers on every campaign — and comparing against your own historical baseline — is far more valuable than checking them reactively after a visible performance drop.
Use this calculator after each send to monitor the health indicators that govern whether your emails land in the inbox, and act on warning signs before they compound into larger deliverability issues.