Free tool
Email List Growth Calculator
See your net list growth rate from new subscribers and unsubscribes. Advanced mode adds list decay so you can project your real, deliverable list size months ahead.
How it works
- 1Enter starting subscribers, new sign-ups and unsubscribes for the period.
- 2We calculate net growth and your growth rate.
- 3In Advanced mode, add a monthly decay rate to project the list forward.
Questions
Frequently asked
Why factor in list decay?
Email lists decay ~2–2.5% per month as people change jobs and abandon addresses. Ignoring it overstates how many contacts you can actually reach.
How do I keep growth healthy?
Net adds matter less than deliverable adds. Verify new sign-ups at the form and re-verify the list periodically so growth reflects reachable contacts, not dead weight.
Can I check a whole list at once?
This free tool checks one at a time. To verify a full list — email, phone and company together — upload a CSV to BounceBlock and preview your first 100 rows free.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.
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