Description: A common approach to estimating the total amount of savings required to fund retirement is to first apply a generic “replacement rate” to pre-retirement income, such as 80%, to get the desired retirement income need. That need is then assumed to increase annually at the rate of inflation for the duration of retirement, which is generally assumed to be some fixed period, such as 30 years. Using government data along with a fairly simple market and mortality model, we explore these assumptions to more accurately estimate the true cost of retirement