How to use this calculator
- Enter opening cohort mrr, expansion mrr, contraction mrr, churned mrr.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
All amounts must refer to one opening cohort and matching period. Losses cannot exceed opening revenue plus expansion.
Worked example
With opening cohort mrr = 10000, expansion mrr = 1500, contraction mrr = 300, churned mrr = 200, net revenue retention is approximately 110%.
What the result means
NRR can exceed 100% when expansion offsets losses. New-customer revenue is excluded.
Common questions
How should I interpret net revenue retention?
NRR can exceed 100% when expansion offsets losses. New-customer revenue is excluded.
What should I check before using this result?
All amounts must refer to one opening cohort and matching period. Losses cannot exceed opening revenue plus expansion.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.