Usage Calculator is an Android application developed by Enrico Weinhold. It is a great tool for keeping track of all your household meters like electrical power, water or gas, all in one view. The application is free to use and provides a range of features to help you stay on top of your usage and avoid surprises in your next bill.

The application provides meters for different use cases, including electrical power, gas, water, and even a reverse counter for heating oil tanks. It offers an overview of usage per month and trends, along with different charts to visualize the usage. You can also set a reading reminder to ensure you never miss a reading. Additionally, the application comes with a torch light function and automatic backup. You can also import and export data in CSV format.

The premium version, available through in-app billing, offers unlimited meters (the free version only allows for two meters) and removes ads. Overall, Usage Calculator is a great application for anyone who wants to keep track of their household meters and usage in a simple and efficient way.