Abakus is a program for basic, engineering and business calculations on Sony Ericsson Mobile phones.

Abakus application operates in four modus:

• Simple calculator
• Engineering calculator
• Unit converter
• Mortgage calculator

Simple calculator:
a calculator with decimal characters that allows user to make simple arithmetical operations, also using Memory function.

Engineering calculator:
a calculator with 32 decimal and alpha characters that allows the user to make difficult engineering calculations. The most common modes and most used mathematical functions can be calculated here.

Unit converter:
allows the user to convert units within the selected group. There are 17 groups of units, every group has from 4 to 40 units that can be converted into each other.

Mortgage calculator:
allows the user to calculate the mortgage based on the loan amount, loan term, interest, annual tax and annual insurance.