Calcpad

Calcpad is software for performing engineering and scientific calculations. The program allows creating interactive documents with a mix of text, formulas, diagrams, and graphs. It supports units of measurement and automatic conversion. Calculations are executed in real-time with unit verification. Documents are saved in HTML format for distribution.

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• Equation editor. Includes an editor for writing mathematical formulas with natural syntax. Supports arithmetic operators, functions, parentheses, and operator precedence. Expressions are evaluated automatically during typing.
• Units of measurement. Manages physical units in calculations with automatic conversion between systems. Verifies dimensional compatibility in operations. Prevents errors through dimensional analysis of expressions.
• Force diagrams. Generates internal force diagrams for beams and structures. Calculates and graphically represents bending moments, shear forces, and axial forces. Supports different types of supports and loads.
• 2D graphs. Creates graphical representations of functions and data. Customizes axes, scales, and line styles. Exports graphs to image formats for inclusion in reports.
• Structured programming. Implements programming structures such as loops, conditionals, and functions. Allows the creation of complex algorithms to solve technical problems.
• Material library. Contains predefined properties of construction materials. Includes steels, concretes, woods, and other materials with their mechanical characteristics.
• Cross-sections. Calculates geometric properties of steel and concrete sections. Determines area, inertia, plastic modulus, and other sectional parameters.
• Numerical calculations. Performs matrix operations, solves differential equations and linear systems. Implements numerical methods for engineering problems.
• Report generation. Produces technical documents with professional formatting. Combines text, calculations, results, and graphs into reports ready for printing.
• Stability analysis. Evaluates the stability of structures according to current regulations. Verifies ultimate and serviceability limit states for structural elements.
• Customizable interface. Adapts the working environment with panel layouts and visual themes. Configures keyboard shortcuts and user preferences for different workflows.
• Export to multiple formats. Saves results in PDF, HTML, XML, and plain text. Allows integration with other engineering software through data exchange.

Calcpad was created by civil engineer Georgi St. Georgiev. Development began in 2005 as a tool for structural engineering calculations. The program is written in C# using the .NET framework. The first public version was released in 2007.

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