Average revenue per user (ARPU) measures revenue relative to an issuer-defined user population over a period.
A simplified formulation is:
ARPU = revenue attributed to a user population ÷ average users in that population
ARPU is useful for analyzing monetization, but it is not a standardized GAAP measure and can be defined differently by different companies.
The denominator is part of the definition
One company may calculate ARPU using average monthly active users. Another may use average daily active users, paid subscribers, accounts, or another population.
Pinterest defines ARPU using revenue in a geography divided by average MAUs in that geography. Snap defines quarterly ARPU using quarterly revenue divided by average DAUs.
Those are both reasonable issuer-defined metrics, but they are not directly comparable without adjustment.
Revenue scope matters too
Companies may attribute advertising or other revenue to users based on the geography where activity occurs rather than the customer's billing address.
That means the revenue numerator used for ARPU can differ from the geography presentation in the audited financial statements.
Investors should check:
- revenue included in the numerator;
- user population in the denominator;
- average versus period-end users;
- geography attribution;
- currency effects;
- acquisitions or product-scope changes; and
- changes in measurement methodology.
ARPU growth is not automatically price growth
ARPU can rise because of higher prices, more advertising load, stronger ad pricing, better targeting, more transactions, higher engagement, mix shifts toward better-monetized regions, or a shrinking low-value user population.
It can therefore increase without the company having stronger Pricing Power.
Likewise, ARPU can decline while total revenue grows if user growth is sufficiently strong.
ARPU versus unit economics
ARPU describes revenue per user under the issuer's definition. It does not by itself measure contribution profit, Customer Lifetime Value, acquisition efficiency, retention, or cash flow.
A business with high ARPU can still have unattractive economics if servicing, content, traffic-acquisition, or customer-acquisition costs are too high.
Investor interpretation
Use ARPU together with Monthly Active Users, Daily Active Users, user growth, retention, margins, and cash flow. Preserve each issuer's numerator and denominator before comparing levels or growth rates.
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