SaaS Net Revenue Retention (NRR) Calculator for 2026

Calculate your Net Revenue Retention and Gross Revenue Retention from starting MRR, expansion, contraction, and churn to benchmark customer growth.

Mathematical Audit

How Net Revenue Retention Is Calculated

NRR measures revenue growth or decline from your existing customer base only, including expansion, contraction, and churn — new customer revenue is excluded.

Ending MRR = Starting MRR + Expansion MRR − Contraction MRR − Churned MRR
NRR (%) = Ending MRR ÷ Starting MRR × 100
GRR (%) = (Starting MRR − Contraction MRR − Churned MRR) ÷ Starting MRR × 100

NRR has no upper cap since expansion revenue can push it above 100%. GRR is always capped at 100% since it excludes expansion. A wide gap between NRR and GRR (more than ~30 points) can mean expansion from a few large accounts is masking broader churn — always review both metrics together.

Operational Guide

How to Use the NRR Calculator

1

Enter Starting MRR

Monthly recurring revenue from your existing customer base at the beginning of the period. Exclude new customers acquired during the period.

2

Enter Expansion MRR

Additional MRR from upsells, cross-sells, and seat/usage growth among existing customers.

3

Enter Contraction MRR

MRR lost from downgrades or reduced usage among existing customers who did not fully churn.

4

Enter Churned MRR

MRR lost from customers who fully cancelled during the period.

5

Review your NRR and GRR

See your Net Revenue Retention, Gross Revenue Retention, and how they compare to industry benchmarks.

Real-World Scenario Example

"A SaaS company starts the month with $100,000 in MRR, gains $8,000 from expansion, loses $3,000 to contraction, and loses $5,000 to churn."

Inputs

startingMrr:100000
expansionMrr:8000
contractionMrr:3000
churnedMrr:5000

Result

Ending MRR = $100,000, NRR = 100%, GRR = 92% — expansion exactly offset contraction and churn, holding revenue flat from existing customers.

Important Disclaimer

This calculator provides a single-period estimate. For decision-making, NRR and GRR are most reliable when calculated on a trailing 12-month basis and tracked as a multi-period trend rather than a single month or quarter.

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Sources & References

Gainsight — Net Revenue Retention: How to Calculate NRR with Benchmarks

https://www.gainsight.com/blog/net-revenue-retention/

Corporate Finance Institute — Net Revenue Retention (NRR): Meaning, Formula, & How to Calculate

https://corporatefinanceinstitute.com/resources/valuation/nrr-meaning-calculation-guide/