It is important to use a retirement calculator before planning to invest in a retirement plan for the following reasons: 1- To determine the affordable premium for the required annuity amount, 2- To find the right policy features, such as the premium payment term, premium payment mode, and annuity option, that will suit your financial needs, 3- To make well-informed decisions on long-term financial planning, 4- To ensure the necessary funds to lead a dignified lifestyle without compromising your lifestyle.