Average Revenue Per User

What ARPU is for

ARPU converts a revenue total into a per-customer unit, which is what makes several other metrics computable. It is the numerator in lifetime value, the basis for CAC payback, and the fastest read on whether a pricing change actually moved the business. It also answers a question a founder asks constantly: is growth coming from more customers, or from better ones?

That decomposition is the real value. MRR growth of 10% means something quite different when customer count grew 10% and ARPU was flat than when customer count was flat and ARPU grew 10%. The first is an acquisition story, the second a pricing or expansion story, and they have different limits.

ARPU and ARPA are not always the same number

In a single-seat product they are identical. In a per-seat B2B product they are not, and the gap can be large: an account paying $900 a month for thirty seats is one account at $900 of ARPA and thirty users at $30 of ARPU. Both are useful — ARPA governs your sales motion and unit economics, per-seat ARPU governs pricing design — but a business that quotes one while its benchmark uses the other will draw the wrong conclusion every time. The convention worth adopting is to compute at the account level, call it ARPA, and treat per-seat as a separate pricing metric.

The average is the wrong statistic for most subscription bases

Subscription revenue distributions are almost always right-skewed: a long tail of small accounts and a handful of large ones. The arithmetic mean sits above the typical customer, sometimes far above, and it moves whenever a single large account arrives or leaves. In the worked example above, eight accounts out of 232 pull ARPU 51% above the value of an ordinary customer.

Two corrections. Publish the median next to the mean — a wide gap is itself the signal that the base is concentrated. And segment: a self-serve plan and an enterprise contract share nothing except a currency symbol, and one blended ARPU describes neither. Segmented ARPU by plan tier is usually the first genuinely actionable version of this metric a company produces.

Which customers belong in the denominator

Only active paying accounts. Free-plan users and trialists are excluded, and this is not a detail: a freemium product with 40,000 free users and 900 paying ones has an ARPU of MRR ÷ 900. Dividing by 40,900 produces a number sometimes called "revenue per user" that is real for consumer businesses reporting monetisation, but it is not the figure that feeds LTV, and mixing the two into one series is how a metric quietly stops meaning anything. If your product has a large free tier, publish both under different names.

Rising ARPU is not automatically good news

ARPU rises for one flattering reason and two unflattering ones. Flattering: existing customers are expanding, or new customers are landing on larger plans. Unflattering: small customers churned faster than large ones, or acquisition stalled while the surviving base expanded. Both of the latter make the average go up while the business gets worse, so read ARPU next to customer count and churn rather than alone. A rising ARPU with a shrinking customer base is a business consolidating into fewer, larger accounts — sometimes a strategy, more often a symptom.