Definition
Email NRR contribution is the portion of net revenue retention (NRR) that is driven by email activity. NRR measures how much revenue a business retains from existing customers after accounting for expansion, churn, and contraction, expressed as a percentage of starting revenue. Email NRR contribution isolates the role that email plays in retaining and growing that revenue through campaigns, win-back flows, and upsell offers.
How It Works
NRR tells a business whether its existing customer base is growing or shrinking in value. Email influences both sides of that equation.
- Retention — email keeps subscribers engaged and purchasing, reducing churn and contraction.
- Expansion — email drives upsells, cross-sells, and upgrades, adding expansion revenue.
- Attribution — email NRR contribution credits the portion of retention and expansion that email campaigns produce.
By measuring NRR with and without email activity, or by attributing specific revenue movements to email campaigns, a sender can quantify how much email contributes to the overall NRR figure. This connects email directly to the durability of the revenue base.
How to Calculate
Calculate NRR in four steps, then isolate email's contribution:
- Measure starting revenue — record revenue from existing customers at the period start.
- Add expansion — add revenue from upsells, cross-sells, and upgrades.
- Subtract churn and contraction — subtract revenue lost to cancellations and downgrades.
- Divide — divide the result by starting revenue.
NRR = (Starting Revenue + Expansion - Churn - Contraction) / Starting Revenue
| Variable | Description |
|---|---|
| Starting Revenue | Revenue from existing customers at period start |
| Expansion | Added revenue from existing customers |
| Churn and Contraction | Revenue lost to cancellations and downgrades |
Example
A subscription business starts the quarter with £200,000 in customer revenue, adds £30,000 in expansion, and loses £20,000 to churn and contraction. Its NRR is (£200,000 + £30,000 - £20,000) / £200,000, or 105%. Attribution shows email drove £18,000 of the expansion and prevented £8,000 of churn, so email's NRR contribution is material to the net result.
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Frequently Asked Questions
For subscription businesses, an NRR above 100% indicates the existing customer base is growing in value, while below 100% means it is shrinking. Email that drives expansion is often key to crossing that threshold.
Revenue retention typically measures retained revenue without expansion, while NRR also includes expansion. NRR can therefore exceed 100%, whereas simple retention cannot.
It is measured by attributing retention and expansion movements to email campaigns, or by comparing NRR between audiences that receive email and holdout groups that do not.
It links email to the durability of revenue, not just one-off campaigns. Demonstrating a strong NRR contribution justifies continued investment in retention and expansion email programs, strengthening overall email-roi.