Calculator Notepad

Calculator Notepad is an open source, free-form text calculator, Chrome extension.

Installation

1. Download and uncompress zip.
2. In Chrome, go to the extensions page at chrome://extensions/.
3. Enable Developer Mode.
4. Choose Load Unpacked and select the Calculator Notepad folder.

Usage

Basic

Calculator Notepad will analyse each line in the input and attempt to calculate any expressions it finds. Each new line represents a new expression.

100 + 100
200 - (50 + 50)

To help give context to your calculations, you can type notes which Calculator Notepad will recognise as a comment.

Total:
1000 + 100

Operations

Functions

Constants

Variables

Calculator Notepad supports custom variables which allows you to assign values to words to help give more context to your expressions. Variables should follow some simple rules.

1. Variable names can consist of letters and underscores.
2. Variable names should not contain spaces.
3. Variable names are case-sensitive.
4. Variables can only be declared once.
5. Variables names cannot be a symbol that represents a function or operator.

To declare a variable, type the name followed by and equals and the value you want to assign.

expenses = 5000

Once a variable has been declared, you can reference it at any point after it's declaration. Attempting to reference a variable before it has been declared will result in an error.

expenses = 5000
10000 - expenses

Variables can be also referenced within separate variable declarations.

expenses = 5000
subtotal = expenses - 1000

To change the value of a variable, simply update the variable value in the text input area and all expressions containing your variable will be automatically updated.

Options

To access options, right-click on the extension icon.

• Choose from system, light or dark themes.

Attributions

• Calculations are performed by the brilliant math-expression-evaluator.