Free SaaS calculator
Net Revenue Retention Calculator
Use this NRR calculator to understand whether an existing customer cohort expands or contracts after upgrades, downgrades, and churn. It also shows GRR for a stricter retention view.
How to use this calculator
Enter starting MRR for the customer cohort you are measuring.
Add expansion, contraction, and churn from the same cohort and period.
Compare NRR and GRR to understand expansion strength and downside retention.
Calculator Inputs
Adjust assumptions and review the result.
MRR from the existing customer cohort at the start of the period.
Added recurring revenue from upgrades, seats, usage, or add-ons.
Recurring revenue lost from downgrades or reduced usage.
Recurring revenue lost from customers who canceled.
Export or save this scenario for planning notes.
Net revenue retention
102%
Includes expansion
Gross revenue retention
90%
Excludes expansion
Ending cohort MRR
$102,000
Retained revenue after movement
Interpret this result
Expansion offsets losses
This cohort expands after churn and contraction because expansion MRR offsets lost recurring revenue. Review GRR too, because strong expansion can hide cancellation pressure.
Assumption quality check
- The calculation assumes all inputs belong to the same starting cohort and measurement period.
- GRR gives a stricter view because it ignores expansion revenue.
Formula used
NRR = (Starting MRR + Expansion - Contraction - Churn) / Starting MRR
NRR
(Starting MRR + Expansion MRR - Contraction MRR - Churned MRR) / Starting MRR x 100
GRR
(Starting MRR - Contraction MRR - Churned MRR) / Starting MRR x 100
Ending cohort MRR
Starting MRR + Expansion MRR - Contraction MRR - Churned MRR
For broader model limits, read the Aura Revenue methodology.
Educational disclaimer
Aura Revenue provides educational forecasting tools and examples only. Outputs are estimates based on user-provided assumptions and should not be treated as financial, legal, tax, accounting, or investment advice.
Common mistakes to avoid
- Including new customer MRR in NRR.
- Mixing cohorts or time periods in the same calculation.
- Looking only at NRR while ignoring weak gross revenue retention.
Related resources
Next planning step
Use this result in a forecast workflow
A single metric is useful, but SaaS planning works best when revenue, churn, acquisition efficiency, and capital efficiency are reviewed together.
NRR Calculator FAQ
What is NRR?
NRR measures retained recurring revenue from an existing cohort after expansion, contraction, and churn.
What is GRR?
GRR measures retained recurring revenue before expansion. It shows downside retention from churn and contraction.
Should new customer revenue be included?
No. NRR focuses on an existing customer cohort, so new customer MRR should be excluded.