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Expansion MRR Calculator

Enter upgrading accounts and their average MRR increase to find expansion MRR.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Expansion MRR is the additional monthly recurring revenue a SaaS company earns from its existing customer base — through upgrades, added seats, or cross-sells — as opposed to revenue from brand-new customers. This calculator sums the MRR increase across upgrading accounts, expresses it as an expansion rate (Expansion MRR ÷ starting MRR), and projects the annualized impact if that expansion pace continued for a full year.

Expansion MRR is one of the clearest signals of product-led growth and net revenue retention (NRR): a company with strong expansion can grow revenue even with zero new customer acquisition, and NRR above 100% (expansion outpacing churn and contraction) is a benchmark investors watch closely. SaaS founders, revenue operations teams, and venture investors track expansion MRR monthly alongside new MRR and churned MRR to build a full MRR waterfall and gauge the health of the existing customer base.

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