Net subscriber growth per month. The Email List Growth Rate Calculator takes new subscribers this month, unsubscribes, hard bounces and removals, list size at the start of the month and returns net list growth rate plus net new subscribers, list size at the end. Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Marketing metrics are most useful as trends and comparisons between channels. Measure every campaign the same way, over the same period, and judge it against your gross margin rather than against revenue alone. Use the worked example below to check the maths against your own figures.
How the Email List Growth Rate Calculator works
Lists decay by 20–30% a year through churn and dead addresses, so a healthy list needs steady new sign-ups just to stand still.
Worked example
With the example values (new subscribers this month of 900, unsubscribes of 150, hard bounces and removals of 60, list size at the start of the month of 20000), the net list growth rate is 3.45%; net new subscribers 690, list size at the end 20,690. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is net list growth rate calculated?
growth rate = (new subscribers − unsubscribes − bounces) ÷ starting list size.
Which figures do I need?
New subscribers this month, unsubscribes, hard bounces and removals, list size at the start of the month. Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
How often should I track this metric?
Weekly for live campaigns, monthly for channel comparisons, and always over the same period for spend and results so the figures line up.
