What revenue per subscriber means
Revenue per subscriber divides attributed or tracked email revenue by the active subscriber base used for the same period. It can help compare list productivity over time, especially when list size is growing faster or slower than revenue.
The number depends heavily on attribution rules. A platform may credit email with revenue using a click or view window that does not match finance revenue, so label the source clearly.
Forecast revenue = active subscribers × RPS. Subscribers needed = revenue goal ÷ RPS.
Worked example
An email program attributes $60,000 of revenue to a list of 20,000 active subscribers during a month. RPS is $3.00. If the active list grows to 25,000 and behavior stays similar, the same rate implies about $75,000 of tracked revenue.
How to use the result
Use RPS as a list-productivity measure, not as proof that every subscriber caused that amount of incremental revenue. Compare it with unsubscribe rate, deliverability, conversion and margin.
Common mistakes
- Using total historical contacts instead of the active deliverable list.
- Changing attribution windows between periods.
- Forecasting future revenue without considering seasonality or list quality.
When to recalculate
Recalculate for consistent periods and after major changes to list quality, sending frequency, promotions or attribution settings.
Frequently asked questions
Should I include inactive subscribers?
Use the denominator that matches the question. For current program productivity, an active deliverable list is usually more useful than all historical contacts.
Is RPS the same as customer lifetime value?
No. RPS is a period-specific email productivity metric; LTV estimates customer value over a longer relationship.