A retirement calculator is a valuable tool that helps individuals plan for their financial future by estimating how much money they will need to retire comfortably. By factoring in key details such as current savings, income, expenses, age, and desired retirement age, it provides a clear picture of whether a person is on track to meet their goals. This insight allows users to adjust their savings rate, investment strategy, or retirement timeline to stay aligned with their financial objectives. Ultimately, a retirement calculator promotes smarter decision-making and greater peace of mind about long-term financial security.