Net Revenue Retention (NRR) Calculator

How to use this calculator

1. Enter Starting MRR — the monthly recurring revenue at the beginning of the period you're analyzing.
2. Enter Expansion MRR — revenue gained from existing customers through upgrades, cross-sells, and add-ons (not new customer acquisition).
3. Enter Contraction MRR — revenue lost from customers who downgraded but did not cancel.
4. Enter Churned MRR — revenue lost from customers who canceled entirely.
5. Click Calculate — see your NRR percentage and how it compares to SaaS benchmarks.

Why NRR matters in SaaS due diligence

Net Revenue Retention is one of the most scrutinized metrics in a SaaS acquisition. While a seller may report a headline NRR of 110%+, the raw subscription CSV often tells a different story. Sellers can inflate NRR by classifying churned accounts as "paused," treating one-time add-ons as recurring expansion, or excluding contraction from specific customer segments. The gap between reported and actual NRR can be 5–15 percentage points — directly negotiation-relevant.

For deeper buyer-side analysis, ChurnLens decomposes NRR into its components and cross-references them against the Revenue Quality Scorecard and MRR Trajectory Forensics to identify whether revenue retention is improving or deteriorating over time.

NRR benchmarks: what's a "good" number?

The median SaaS NRR is approximately 106% (Benchmarkit 2025). The top quartile exceeds 120%. Below 100% means the business is shrinking on a same-customer basis — a major red flag in any acquisition. However, the raw NRR number masks important dynamics: a business with 130% NRR but 90% logo retention may have a dangerous concentration problem where a few expanding accounts prop up the metric. See full NRR benchmarks at SaaS Net Revenue Retention Benchmarks 2026.