Definition
Revenue per subscriber (RPS) measures the average revenue generated by each person on your email list over a specific period, typically monthly or annually. It is one of the most important metrics for understanding the financial value of your email programme.
RPS helps you make data-driven decisions about list acquisition costs, content strategy, and segmentation. If you know your RPS, you know how much you can afford to spend acquiring each new subscriber.
Formula
Revenue per subscriber is calculated by dividing total email-attributed revenue by the total number of subscribers.
RPS = Total Email Revenue / Total Subscribers
For monthly RPS:
Monthly RPS = Total Email Revenue in Month / Total Subscribers at End of Month
| Variable | Description |
|---|---|
| Total Email Revenue | Revenue attributed to email campaigns in the period |
| Total Subscribers | Total active subscribers at the end of the period |
Average Benchmark
RPS varies significantly by industry, business model, and average order value.
| Business Type | Monthly RPS |
|---|---|
| Ecommerce (low AOV) | $0.50 - $2.00 |
| Ecommerce (high AOV) | $2.00 - $8.00 |
| SaaS (subscription) | $1.00 - $5.00 |
| Media / Publishing | $0.10 - $0.50 |
| B2B Services | $5.00 - $20.00 |
| Nonprofit | $0.05 - $0.50 |
Annual revenue per subscriber is typically 8-12 times the monthly figure, depending on seasonal variation and retention.
How to Improve Revenue Per Subscriber
- Segment by engagement and value: High-engagement subscribers should receive different content than low-engagement subscribers. Tailor frequency and offers accordingly.
- Nurture new subscribers effectively: The first 30 days of a subscriber's journey set expectations for the entire relationship. Use a welcome sequence that builds trust and drives early conversions.
- Increase email frequency for engaged segments: Subscribers who consistently engage can handle more frequent emails without churning. Test increasing send frequency for your top engagement segment.
- Use behaviour-triggered emails: Automated emails based on subscriber behaviour (abandoned cart, product views, purchase anniversaries) consistently outperform broadcast emails in revenue per subscriber.
- Reduce churn: Every subscriber who unsubscribes or goes inactive reduces your RPS. Focus on delivering consistent value and re-engaging at-risk subscribers before they leave.
- Improve list quality: Higher-quality subscribers acquired through intentional channels (search, referrals, content) have higher RPS than subscribers acquired through low-intent channels (generic pop-ups, purchased lists).
Example Calculation
If you have 8,500 active subscribers and your email programme generates $12,750 in attributed revenue over a month:
Monthly RPS = $12,750 / 8,500 = $1.50
This means each subscriber generated $1.50 on average during that month. If this is consistent, the annual value per subscriber would be approximately $18.00.
Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
Abuse Complaint
An abuse complaint is a report from a recipient who marks an email as spam, which negatively affects sender reputation and deliverability.
AIDA Model for Email
The AIDA model (Attention, Interest, Desire, Action) is a classic copywriting framework used to structure email campaigns that guide subscribers from awareness to conversion.
AMP for Email
AMP for Email is a Google-developed framework that allows email messages to include interactive elements like forms, carousels, accordions, and live content. It turns static emails into dynamic, interactive experiences directly inside the inbox.
Anchoring Effect in Email Marketing
The anchoring effect is a cognitive bias where the first piece of information presented (the anchor) influences subsequent decisions, used in email to frame pricing and value perception.
Frequently Asked Questions
A good RPS depends entirely on your business model and margins. For ecommerce with a $50 average order value, a monthly RPS of $1-$3 is typical. For high-ticket B2B services, RPS can be $10-$50 or more. The most important benchmark is your own RPS trend over time.
Revenue per email measures the revenue generated by each individual email sent. Revenue per subscriber measures the value of each subscriber over a period. RPS accounts for the fact that some subscribers convert multiple times and receive multiple emails — it is a broader measure of subscriber value.
Focus on relevance and timing rather than frequency. Use behavioural triggers to send the right message at the right moment. Personalise content based on past purchases and browsing behaviour. Test higher frequencies with engaged segments only. Track both RPS and unsubscribe rate simultaneously so you can spot if growth comes at the cost of churn.
RPS measures revenue per subscriber over a specific period (usually monthly), while subscriber lifetime value (LTV) projects total revenue a subscriber will generate throughout their entire relationship with your brand. LTV = RPS × average subscriber lifespan in months. Improving RPS directly increases LTV, making it one of the most impactful metrics for long-term email programme profitability.
RPS typically increases because you are removing subscribers who generate zero revenue from the denominator. Your total email revenue may stay the same or dip slightly, but your per-subscriber efficiency improves. This is healthy — it means your resources are focused on engaged, valuable subscribers. Track both absolute revenue and RPS to balance list size with per-subscriber value.