Ask ten app publishers what their most important monetization metric is, and you will get ten different answers. eCPM. Fill rate. Total revenue. Impressions per session. They are all useful, but they all tell you part of the story. There is one metric that combines all of them into a single, actionable number: Average Revenue Per Daily Active User, or ARPDAU.
What Is ARPDAU?
ARPDAU measures how much revenue your app generates per active user per day. The formula is simple: take your total ad revenue for a day and divide it by the number of daily active users. If your app made 5,000 dollars yesterday from 100,000 DAU, your ARPDAU is 0.05 dollars — or 5 cents per user per day.
What makes ARPDAU powerful is that it normalizes for user base size. An app with 10 million users and 50,000 dollars in daily revenue has the same ARPDAU as an app with 1 million users and 5,000 dollars — they are equally efficient at monetizing their users. This makes ARPDAU the fairest comparison metric across apps of different sizes and the clearest signal of whether a monetization change actually improved performance.
Why ARPDAU Beats Other Metrics
eCPM Can Be Misleading
A high eCPM means you are getting paid well for the impressions you serve — but if your fill rate is low, many users see no ads at all and generate zero revenue. ARPDAU captures both eCPM and fill rate in a single number.
Total Revenue Masks Efficiency
If your revenue went up 20 percent this month, that sounds great — until you realize your DAU also went up 30 percent. Your monetization actually got less efficient. ARPDAU would have shown the decline immediately.
Fill Rate Alone Is Not Enough
A 99 percent fill rate is meaningless if every impression is filled at rock-bottom eCPMs. ARPDAU forces you to optimize for the combination of fill rate and eCPM that produces the most revenue per user.
ARPDAU Benchmarks
ARPDAU varies enormously by app category, geography, and platform. Casual gaming apps in the US typically see ARPDAU between 3 and 8 cents. Hyper-casual games range from 5 to 15 cents due to higher ad frequency. Utility and productivity apps often see lower ARPDAU — 1 to 3 cents — because they show fewer ads per session. Social and content apps fall somewhere in between.
The most important benchmark is your own historical ARPDAU. Track it daily and look for trends. A gradually declining ARPDAU — even if total revenue is growing — signals that your monetization is not keeping pace with your user growth, and intervention is needed.
How to Improve ARPDAU
Increase Ad Impressions Per User
The simplest lever is showing more ads per session. But this has to be balanced against user experience. The optimal number varies by app category — test incrementally and monitor retention alongside ARPDAU. If ARPDAU goes up but 7-day retention drops, you have gone too far.
Improve eCPM
Better eCPMs mean more revenue from the same number of impressions. Add demand sources to your waterfall, optimize floor prices, and ensure you are using the right ad formats for your user experience — rewarded video typically delivers 3 to 5x the eCPM of banners.
Maximize Fill Rate
Every unfilled ad request is a user who could have generated revenue but did not. In emerging markets especially, improving fill rate from 60 to 90 percent can increase ARPDAU by 50 percent even if eCPM stays flat.
Segment and Optimize
Not all users are equal. Users in Tier 1 markets generate dramatically higher ARPDAU than users in emerging markets. Segment your ARPDAU by geography, platform, and user cohort, then optimize each segment independently. A waterfall that is perfect for US iOS users may be terrible for Indian Android users.
ARPDAU is not just a metric — it is a decision framework. Every monetization change you consider should be evaluated through one lens: will this increase ARPDAU? If you cannot answer that question with data, you need to run a test before committing.
ARPDAU and Your Monetization Partner
A good managed monetization partner reports ARPDAU as a primary KPI, not just eCPM and revenue. They should be able to show you ARPDAU trends segmented by the dimensions that matter to your business, and every optimization they propose should be framed in terms of its expected ARPDAU impact. If your partner only talks about eCPM, they are only telling you part of the story.