What Is ARPU in SaaS?
Average Revenue Per User (ARPU) — also called ARPA when measured per account — is MRR divided by the number of paying customers. Rising ARPU over time signals successful expansion revenue from upsells or tier upgrades.
Why it matters: this metric helps founders separate random variation from real business movement. Decisions improve when the metric is tracked in trend form, not one-off snapshots.
How to use it in practice: pair this metric with at least one upstream and one downstream signal. That way, you can explain why it changed and what action should come next.
In Assist Founder, this term appears in context with related indicators so you can move from definition to decision without switching tools.