Financial Glossary
Dollar-Based Net Expansion Rate (DBNER)
Dollar-Based Net Expansion Rate (DBNER), also called Net Revenue Retention (NRR), measures how much revenue a cohort of existing customers generates in the current period relative to what they generated in the prior period. It accounts for expansion revenue (upsells, seat additions, usage growth), contraction (downgrades), and churn. The formula is: DBNER = (Revenue from Customers Present at Start of Prior Period, Measured at End of Current Period) / (Revenue from Those Same Customers at Start of Prior Period) x 100. A DBNER above 100% means the existing customer base is growing revenue even without adding new customers, a hallmark of strong product-led or usage-based SaaS businesses.
Problem & Application
A reservation platform charges campground operators a percentage of booking volume. At the start of the year, its 200 existing customers generated $500,000 in monthly revenue. By year-end, those same 200 customers (excluding any new logos added during the year) generate $560,000 per month -- partly because several operators had record summers and partly because 30 operators upgraded to a higher-tier plan. Ten operators churned, reducing revenue by $25,000. DBNER = ($560,000 / $500,000) x 100 = 112%. The 12% net expansion from the existing base means the company grows revenue even in months when sales closes zero new accounts. Investors in SaaS and usage-based platforms use this metric to assess whether the product is embedded enough to drive organic revenue growth over time.
In Short
DBNER is a key metric for SaaS and subscription businesses, reflecting customer retention and expansion effectiveness.