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Our free Monte Carlo Retirement Simulator runs 1,000 market scenarios in seconds. See if your savings hold up — and exactly how much you need.
Frequently Asked Questions
Plug in your portfolio, withdrawal rate, and timeline. Our Monte Carlo Retirement Simulator shows your real odds of financial independence — free.
A: A Monte Carlo Retirement Simulator runs hundreds or thousands of randomized market scenarios to estimate how likely your portfolio is to last through retirement. Instead of assuming a fixed return, it models real-world volatility — giving you a probability of success, not just a single projection.
A: This simulator runs 1,000 randomized market paths per calculation. More simulations = more statistically reliable results. With 1,000 runs, the success rate percentage is stable and actionable — not a lucky outlier.
A: It's the percentage of simulated scenarios where your portfolio didn't hit zero before your retirement ended. A 92.5% success rate means 925 out of 1,000 simulated market paths left you with money remaining. Most financial planners target 85–95%.
A: Higher stock allocation increases both upside potential and short-term volatility. In most Monte Carlo models, a 60–80% stock allocation produces the best long-term survival rates for 30-year retirements. Going 100% bonds often hurts longevity due to inflation erosion.
A: The 4% rule (Trinity Study) holds up reasonably well for 30-year retirements with a balanced portfolio — but it was modeled on historical U.S. data. This simulator lets you test 3%, 3.5%, and 4% withdrawal rates side-by-side so you can decide what risk level fits your situation.
A: The 10th percentile outcome shows your portfolio's value in the worst 10% of simulated scenarios. It's your downside floor — not a prediction, but a stress-test benchmark. If that number still covers your needs, your plan is resilient to bad market timing.
A: Standard calculators assume a fixed annual return (e.g., 7% every year). That's unrealistic. A Monte Carlo retirement simulator sequences returns randomly — capturing the danger of a market crash in Year 2 vs. Year 28. Sequence-of-returns risk is what actually kills retirement portfolios.
A: Start with your target portfolio size and planned annual withdrawal. Set your expected retirement length (e.g., 40 years for early retirees). Adjust stock allocation until your success rate hits 90%+. The simulator shows exactly how each variable — savings, spending, timeline — shifts your odds of financial independence.