For a long time, I looked at revenue growth as one of the clearest signs that a product was doing well.
New customers were coming in.
Revenue was increasing.
The business was growing.
But there was a question I wasn’t asking often enough:
What are our existing customers doing?
Are they staying?
Are they spending more?
Are they reducing their usage?
That is where Net Revenue Retention (NRR) becomes incredibly useful.
NRR doesn’t just tell you how much revenue you have today. It helps you understand whether your existing customer base is becoming more or less valuable over time.
What Is Net Revenue Retention?
NRR measures how much recurring revenue you retain from your existing customers over a specific period, including expansion, upgrades, downgrades, and churn.
The basic formula is:
NRR = (Starting Revenue + Expansion – Contraction – Churn) / Starting Revenue × 100
Importantly, new customers are not included.
Imagine you start the month with $100,000 in recurring revenue from existing customers.
During the month:
- Customers add $15,000 in expansion revenue
- $5,000 is lost through downgrades
- $10,000 is lost through churn
Your ending revenue from that original customer group is $100,000.
Your NRR is therefore 100%.
The customer base didn’t grow, but it didn’t shrink either.
What Does 100% NRR Actually Mean?
An NRR of 100% means you’re maintaining the same revenue from your existing customers.
Above 100% means existing customers are generating more revenue than before.
Below 100% means you’re losing more revenue through churn and contraction than you’re gaining through expansion.
For example:
110% NRR: Existing customers grew their spending by 10%.
100% NRR: Existing customer revenue remained flat.
90% NRR: You lost 10% of your existing customer revenue.
That’s why NRR is particularly valuable for subscription and B2B products.
Why Product Managers Should Care
NRR is often treated as a finance or SaaS metric.
I think Product Managers should pay close attention to it.
A declining NRR can be a product signal.
Customers may not be getting enough value.
They may be reducing usage.
They may not be adopting additional capabilities.
Or competitors may be solving their problems better.
On the other hand, strong NRR can indicate that customers are finding enough value to expand their relationship with the product.
That makes NRR closely connected to Product-Market Fit.
NRR Can Reveal Problems Hidden by New Sales
Imagine your company grows revenue by 30% this year.
That sounds excellent.
But suppose your NRR is only 80%.
That means your existing customer base is shrinking significantly, and new customer acquisition is masking the problem.
This is why I don’t like looking at growth metrics in isolation.
New business tells you whether you’re attracting customers.
NRR tells you what is happening after they arrive.
Both stories matter.
Expansion Is an Important Part of the Story
One of the most interesting aspects of NRR is that growth doesn’t have to come from acquiring new customers.
Existing customers can expand.
They may add more users.
Adopt additional products.
Increase usage.
Move to a higher plan.
That expansion can become a powerful growth engine.
As a Product Manager, this raises an important question:
What additional value can we create for customers who are already successful with the product?
That question can lead to opportunities around feature adoption, cross-sell, upsell, and deeper workflows.
Don’t Treat NRR as a Product Scorecard
There is one important caveat.
NRR tells you what happened to revenue.
It doesn’t tell you exactly why.
A customer might expand because of a new feature.
Or because their company grew.
A customer might churn because of poor product experience.
Or because their business shut down.
That’s why I wouldn’t use NRR alone to evaluate product performance.
I’d combine it with retention, usage, feature adoption, customer feedback, and customer health signals.
The numbers tell you where to investigate.
The customer story tells you why.
Final Thought
What I like most about NRR is that it shifts the conversation from acquisition to relationships.
Getting a customer to sign a contract is one thing.
Keeping them, helping them succeed, and giving them reasons to expand is something else entirely.
As Product Managers, that’s where we should spend more of our attention.
Because sustainable growth isn’t just about constantly finding new customers.
It’s about creating enough value that the customers you already have choose to stay, grow, and invest more in your product.
And that’s what NRR helps you see.
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