TreeCalc

TreeCalc evaluates the expression you type, then shows how that expression is built.

Type numbers, parentheses, and operators as usual. Press equals to get the result. Swipe left or right from the calculator — or from the tree screen — to switch views. Either direction opens the other screen.

The expression tree is expandable and collapsible. Operator nodes use clear arithmetic icons. Postfix (Reverse Polish) notation is listed above the tree so you can follow the same evaluation order the engine uses.

Numerical systems 2, 8, 10, and 16 are supported. Decimal mode includes scientific functions. Binary, octal, and hexadecimal work with whole numbers, including bitwise operations.

Light, dark, and auto themes are available. Auto follows day and night (light from 06:00 to 18:00). The interface language follows the phone locale (English and Hungarian).

TreeCalc is an educational calculator. The expression tree is shown for demonstration purposes.

Author: László Kővári, 2005 – 2026
Contact: laszlo.kovary@gmail.com