A mobile app's revenue for a given period is simply its full income before the Apple Tax (15% or 30% cut).
How to calculate app revenue?
It can be done in three ways:
Via the App Store Connect dashboard. Go to your account and then refer to Sales and Trends tab.
Via the Apple Sales Reports. It's a technical report which you can download in CSV and then analyze.
Via the raw transaction events. This is the most accurate option which works on the user level. Get all the information about your users' transactions, sum all the revenue and subtract the refunds. You'll get more detailed analytics including revenue source and attribution, currency, and more.
For Android, it works in the same way only with the Google Play Console.
How can Adapty help?
Adapty automatically calculates revenue from raw transactions. Get all the information about metrics on the user and event levels without a single line of server coding. Adapty SDK works for all platforms.