Definition
Net list growth rate is the percentage change in your email list size over a specific period after accounting for all new subscribers minus all lost subscribers (unsubscribes, bounces, spam complaints, and inactive removals). It is the true measure of list health — a growing list adds net new subscribers, while a declining list loses more subscribers than it gains.
Gross list growth (new subscribers only) can be misleading. A list adding 10,000 new subscribers but losing 9,000 is effectively flat. Net growth tells you whether your list is actually expanding.
Net List Growth Rate Formula
Net List Growth Rate = ((New Subscribers - Churned Subscribers) / Starting List Size) × 100
Example Calculation
Starting with 100,000 subscribers, adding 5,000 new, losing 3,000 to churn:
Net Growth = ((5,000 - 3,000) / 100,000) × 100 = 2% monthly growth
Net vs Gross Growth
| Metric | Formula | What It Tells You |
|---|---|---|
| Gross growth rate | New subs / Starting list | How many new subscribers you are adding |
| Churn rate | Lost subs / Starting list | How many subscribers you are losing |
| Net growth rate | (New - Lost) / Starting list | Whether your list is actually growing |
Average Benchmarks
| List Size | Healthy Net Monthly Growth | Excellent Net Monthly Growth |
|---|---|---|
| Small (under 10,000) | 3-5% | 8%+ |
| Medium (10k-100k) | 2-4% | 5%+ |
| Large (100k-500k) | 1-3% | 4%+ |
| Enterprise (500k+) | 0.5-2% | 3%+ |
How to Improve Net List Growth
| Strategy | Impact | Timeframe |
|---|---|---|
| Improve list building campaigns | Increases new subscriber acquisition | 1-3 months |
| Reduce churn through targeting | Decreases subscriber losses | 2-4 months |
| Implement re-engagement campaigns | Recovers at-risk subscribers | 1-2 months |
| Use preference centres | Reduces unnecessary unsubscribes | 1-2 months |
| Improve list hygiene | Removes inactive subscribers cleanly | Ongoing |
Tracking Net Growth
- Track monthly: Net growth should be calculated monthly to identify trends early.
- Separate by source: Track which acquisition sources produce the best net growth (low churn relative to acquisition).
- Consider seasonal patterns: Net growth naturally varies by season. Compare year-over-year rather than month-to-month for strategic analysis.
- Set net growth targets: Gross subscriber targets are less meaningful than net growth targets. Aim for positive net growth each month.
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.
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.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.
Frequently Asked Questions
A positive net growth rate (above 0%) means your list is growing. Above 2% monthly is good. Above 5% monthly is excellent. A negative net growth rate means your list is shrinking and requires urgent attention to either acquisition or retention.
Net growth is the combined effect of acquisition and churn. Churn is only one component. You can have high churn but positive net growth if acquisition outpaces losses. Net growth is the more complete picture.
Both. Gross growth tells you how effective your acquisition campaigns are. Net growth tells you whether your overall programme is sustainable. A healthy programme tracks both.
Focusing only on acquisition while ignoring churn. Adding 5,000 subscribers per month is meaningless if 5,000 are leaving. Net growth keeps acquisition and retention in balance.
Net growth typically increases in January (new year resolutions), decreases in summer (lower engagement), and increases again in late Q4. Compare your net growth to the same period last year for an accurate trend.