Why do you need a new way to plan your retirement?
Most retirement calculators will fail you if you're looking for lifetime income.
They are based solely on returns from investments like mutual funds and ETF's, and leave you with significant market risk.
They calculate the amount of savings you need to meet a specified income goal for a fixed period, rather than measuring the income your savings can guarantee you for life, and thus leave you with longevity risk.
Even Congress recognizes this issue in this bill they are considering.