What Are Bad Emails
Costing You?

The calculator uses real industry data for ESP pricing and bounce rate benchmarks, and conservative estimates for revenue impact. The actual ROI from email verification is often higher because the calculator doesn't include reputation recovery benefits (improved inbox placement for your whole list) or reduced spam complaint handling costs.

Use your hard bounce rate from your last 3 campaigns, averaged. Most ESPs report this in campaign analytics. If you've never cleaned your list, a rate of 5-15% is common for lists older than 12 months. If you're importing a purchased or scraped list, assume 20-30%.

Yes, the "Revenue Recovered" line includes a 15% inbox placement uplift on your net deliverable volume - this is a conservative estimate of the downstream benefit of having a lower bounce rate. The calculator does not try to model the full long-term sender reputation recovery, which can be significantly larger.

Use your current per-send cost. Most ESPs price by sends or by contact count. If you pay by contact count, divide your monthly cost by your list size, then multiply by 1,000 to get $/1K. If you pay per send (like SendGrid), use that rate directly.

Both, depending on your workflow. Re-verifying your full list annually is common (once-off per cycle). Real-time API verification at sign-up is a recurring operational cost per new contact. The calculator models annual re-verification of your full list at $2.80/1K (Scale plan) - which is the most conservative scenario.