Enter new subscribers, unsubscribes and your starting list size to see your true list growth rate and net new subscribers, so you know if your audience is expanding or quietly shrinking.
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A subscriber list looks healthy right up until you subtract the people leaving. List growth rate is the honest number, because it nets unsubscribes and losses against new signups over the same period. This calculator takes your new subscribers, your unsubscribes and your starting list size and returns both the growth rate and the net change, so you can see whether your list is genuinely building.
The formula is net new subscribers divided by your starting list size, multiplied by 100, where net new is new signups minus unsubscribes and bounces. If you gained 320 subscribers, lost 45, and started with 8,000, the net is 275, divided by 8,000, which is 0.0344, times 100, a growth rate of about 3.44 percent for the period.
Netting out the losses is what makes this number trustworthy. A campaign that adds 320 signups feels great, but if churn quietly removed 45, your real gain is 275. Vanity signup counts hide that erosion, while growth rate puts it front and centre.
Every list decays. People change jobs, lose interest or unsubscribe, and addresses go stale. If new signups only just keep pace with that decay, your list is treading water no matter how big the signup number looks. Tracking growth rate month over month shows whether your acquisition is outrunning your losses.
A steady positive growth rate compounds. A list growing a few percent each month builds a meaningfully larger, more engaged audience over a year, while a flat or negative rate slowly starves every campaign you run of reach.
Give people a clear reason to subscribe, whether that is a genuinely useful resource, a discount or a newsletter worth reading. Put signup opportunities where intent is high, keep the form short, and deliver value quickly so new subscribers stay. On the retention side, send relevant content on a consistent cadence so fewer people leave.
The most durable list growth comes from a steady stream of the right visitors. That is what search and content do best. Request a free audit and we will show you how to turn organic traffic into subscribers who stick around.
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