Abstract: The present invention provides the user a financial retirement simulation tool that accepts user inputs like investment portfolio value, retirement age ranges and post retirement spending rules based on the retirement circumstance, further inputs are included like projected market performance and inflation impact assumptions, the invention then simulates a multitude of retirement financial scenarios at various retirement ages and various post retirement spending levels with the retirement circumstance dynamically simulated with the market performance and inflation impact assumptions modified within a statistically acceptable range using the Monte Carlo technique, resulting in a plurality of potential retirement financial scenarios with probabilities of those scenarios occurring.