Tank Calc is an Android application developed by RegalTanks, designed to calculate storage tank volumes for vertical, horizontal, or rectangular storage tanks. It also includes a quick-use liquid volume converter. The app is completely free and does not contain any advertisements or in-app purchases.

To use Tank Calc, simply select the type of storage tank you want to check the capacity of, enter the tank measurements (metric or imperial), and optionally input the liquid fill level of your storage tank. Click the calculate button, and the app will provide you with the tank's volume. You can also save your storage tank details for later use, load and re-calculate, which is ideal if you are tracking the usage and fill levels of your storage tanks.

In addition to its primary features, Tank Calc also includes a handy volume converter. It lets you convert between BBL and Litres, Gallons and Litres, and many other combinations. This feature is incredibly useful for people who work with multiple units of measurement.

Overall, Tank Calc is a simple, easy-to-use application that serves its purpose well. The app is perfect for people who need to calculate the volume of their storage tanks quickly and accurately. The user interface is intuitive, and the app's performance is smooth and efficient.