one-line definition
MAU (Monthly Active Users) counts the number of unique users who engage with your product within a calendar month.
formula: MAU = Unique users who performed at least one meaningful action within a 30-day period
tl;dr
MAU is the standard top-of-funnel engagement metric for SaaS. But a growing MAU with flat revenue means you're acquiring users who don't convert. Always pair MAU with activation rate and trial-to-paid to see the full picture.
Simple definition
MAU counts the unique users who performed at least one meaningful action in your product during a 30-day window. It tells you how many people find enough value to come back at least once per month. For solo founders, MAU is a leading indicator of growth potential — but it says nothing about depth of engagement or willingness to pay.
How to calculate it
Count each unique user who triggered a qualifying event within the last 30 days. If a user logs in 15 times, they still count as one MAU. The key decision is what qualifies as "active" — a page view, a login, or a core action like sending a message or creating a project. Choose the action closest to your product's value and stick with it.
Formula: MAU = Unique users who performed at least one meaningful action within a 30-day period
Example
You run a writing tool for freelancers. In January, 820 unique users opened at least one document. Your MAU is 820. In February, you launch a "daily writing prompt" email. MAU climbs to 1,040 — a 27% increase. But your MRR stays flat at $2,400. That gap tells you the prompts drive visits but not upgrades. Your next move: add a paid-only feature that activates during the writing prompt flow.
Related reading
Related terms
- DAU
- DAU/MAU Ratio
- Retention Cohort
FAQ
What counts as an 'active' user for MAU?+
Define 'active' based on a meaningful action — logging in, creating something, or completing a core workflow. Avoid counting passive visits or bot traffic.
Is MAU useful for early-stage products with few users?+
Below 500 MAU, weekly active users (WAU) gives you faster feedback loops. Switch to MAU once your user base is large enough that monthly trends are visible.