It is an order-of-magnitude estimate. Neither store publishes revenue; the range tells you whether an app earns hundreds, thousands or hundreds of thousands a month, not the exact figure.

Where do I find the numbers?

The rating count and the in-app purchase prices are on the app's store page; the release date is under version history. On Google Play the install band is shown under the app name.

Why does recent pace matter?

An app that peaked years ago earns like it does today. If you know how many ratings it gained last month, use that instead of the lifetime average.

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App revenue calculator

Estimate an app's monthly revenue from what its store page shows: ratings or installs, age and price. A range with every assumption shown, not a made-up single number.

RatingsThe count under the stars on the store pageMonths since launchFrom the version historyTop price, $The highest in-app purchase or subscriptionRatings gained last month (optional)Replaces the lifetime average when known

Estimated monthly revenue

$560 – $12k

Middle of the range about $2.7k a month, from 10,417–20,833 downloads a month at a $29.99 top price.

Assumptions: 50–100 downloads per App Store rating; 1.5–4% of downloads pay; a paying user is worth a tenth to a quarter of the top price each month; renewals add 20–100% on top of new payers.

How it works

Downloads a month: App Store ratings a month × 50–100 downloads per rating, or Google Play's install floor spread over the app's age × 1–2.5.
Paying users: 1.5–4% of downloads, for apps that sell something.
Revenue: a paying user is worth a tenth to a quarter of the top price each month, and renewals add 20–100% on top.
The low ends multiply together and the high ends multiply together, which makes the range wide on purpose. A narrow band would be false precision.

Questions

How accurate is it?: It is an order-of-magnitude estimate. Neither store publishes revenue; the range tells you whether an app earns hundreds, thousands or hundreds of thousands a month, not the exact figure.
Where do I find the numbers?: The rating count and the in-app purchase prices are on the app's store page; the release date is under version history. On Google Play the install band is shown under the app name.
Why does recent pace matter?: An app that peaked years ago earns like it does today. If you know how many ratings it gained last month, use that instead of the lifetime average.

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