MathCalc.ru is an online catalog of calculators designed to help students and other learners solve mathematical problems and understand how to reach the answer. Its central purpose is not only to provide a result, but also to show the intermediate steps, relevant theorems, or formulas involved. Calculators are organized into subject-based sections, with a site search available to help visitors find a suitable tool.

The collection focuses on study-related mathematics, including arithmetic, fractions, and geometry. Users can access tools for long division, multiplication, addition, and subtraction, as well as calculators for solving fraction problems with explanations and comparing fractions. A right-triangle calculator is also available. The site presents these resources as online tools that can be used directly to work through common mathematical exercises.

MathCalc.ru is structured as a practical reference for learners seeking guided calculations across core topics. It also provides information about the project, a feedback option, site policies, and a way to support the project.