There are several online calculators that can help you estimate how much revenue your app might earn from the Google Play Store. Here are a few options you might consider:

1. Sensor Tower: Sensor Tower is a comprehensive app analytics platform that includes an earnings calculator for the Google Play Store. To use the calculator, you’ll need to enter your app’s projected daily active users (DAUs), average revenue per user (ARPU), and the percentage of users that make in-app purchases. The calculator will then provide an estimate of your app’s projected revenue.
2. App Annie: App Annie is another popular app analytics platform that includes an earnings calculator for the Google Play Store. To use the calculator, you’ll need to enter your app’s projected daily active users (DAUs), average revenue per user (ARPU), and the percentage of users that make in-app purchases. The calculator will then provide an estimate of your app’s projected revenue.
3. Mobile Action: Mobile Action is a tool that helps app developers track and optimize their app’s performance in the app store. It includes an earnings calculator for the Google Play Store that allows you to enter your app’s projected daily active users (DAUs), average revenue per user (ARPU), and the percentage of users that make in-app purchases. The calculator will then provide an estimate of your app’s projected revenue.

It’s important to note that these calculators are just estimates, and the actual revenue your app earns may be different. The accuracy of the estimates will depend on the accuracy of the information you enter and the assumptions that the calculator makes.