Airgun Calc is an Android application designed to calculate Joules/ft-lb by weight in grains/gram and speed in FPS or M/S. It is a simple and easy-to-use tool that can be used by anyone who owns an airgun. With a database of different pellets, users can select and filter the pellets they want to use.

The application has a user-friendly interface that is easy to navigate. The main screen displays the input fields for weight and speed, as well as the output fields for Joules and ft-lb. Users can easily select the pellet they want to use from the database and enter the weight and speed to get the desired results. The application also allows users to switch between grains and grams for weight and FPS and M/S for speed.

Overall, Airgun Calc is a helpful tool for airgun enthusiasts who want to calculate the Joules and speed of their pellets. It is a free application that is easy to use and provides accurate results.