All termsMETRICS & KPIS

Expansion Revenue

Also known as: Expansion MRR · Upsell Revenue

DEFINITION

Additional revenue from existing customers through upgrades, add-ons, seat growth, or usage.

In depth

Expansion is the cheapest revenue in SaaS — the customer is already acquired, onboarded, and trusting you. Every dollar of expansion has near-zero CAC.

Common expansion patterns: seat-based (teams grow), usage-based (usage crosses a limit), feature upgrades (unlock a higher tier), add-ons (modular products). Building expansion into the pricing model from day one is far easier than retrofitting.

Put it into practice

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Related terms

NRR
The percentage of revenue retained from existing customers after accounting for expansion, contraction, and churn.
ARPU
The average monthly revenue a SaaS earns per active customer.

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Last reviewed 14 April 2026 by Abhi Verma.