postcss-calc empowers developers to perform calculations directly within their CSS stylesheets, enhancing flexibility and maintainability. It seamlessly integrates with PostCSS to evaluate mathematical expressions, allowing for dynamic value assignments like width: calc(100% - 20px). Reduce CSS complexity, improve code readability, and optimize workflow by embedding calculations directly within the style sheet. This package simplifies responsive design and eliminates the need for preprocessor-specific functions when dealing with complex value manipulations.