Use Formulas on Android
This app is for all the Engineering, Math, or Accounting students or professionals out there. XDA member fantastxmw has created an app that allows the user to input a user defined formula and simply input numbers in the variables to solve the equation. The equation can be saved for later use and it can also be edited to suit your needs.
Please be sure to leave some feedback for the dev.
In some scenarios, you need to do a serial calculations that only the numbers are changed, but you have to input the whole expression again and again.
You need a calc supporting variables which represent the numbers, so every time, you only need to input the numbers. You needn’t to remember the formulas any more.
DaCalc is such a formula calculator. It supports composing a new formula, loading, editing, importing and exporting.
You can find more information in the application thread.