A grade calculator is a simple online tool that helps students calculate their overall academic performance by entering their subject grades, assignments, exams, and sometimes credit units. It automatically computes the final score or percentage based on the provided inputs, making the process faster and more accurate than manual calculation. Students use a grade calculator to track their progress, understand their current standing in a course, and estimate the grades they need to achieve their desired final result. It is widely used because it is easy, quick, and helps improve academic planning and performance.