Retirement Simulator
Model your wealth accumulation, inflation-adjusted income target, retirement shortfall, and required savings with dynamic scenario projections.
Simulation Parameters
Action Plan to Close the Gap
To fully reach your inflation-adjusted target of $4,220,794, you need to invest$1,518 / mo (an additional $518 / mo).
📈 Retirement Growth & Scenario Chart
Projected portfolio value from Age 30 to 65 across market conditions.
How the Retirement Simulator Calculates Your Future Nest Egg
Planning for retirement requires understanding compound interest, long-term purchasing power erosion, and post-retirement withdrawal sustainability. This simulator models your complete financial trajectory using the following principles:
1. Compound Interest & Time Horizon
Your current savings grow via compounding ($P(1+r)^t$), while your monthly contributions form an annuity accumulation schedule. The earlier you start investing, the more exponential compounding does the heavy lifting versus out-of-pocket contributions.
2. Inflation Adjustment
A 3% inflation rate reduces purchasing power by over 50% across 25 years. A retiree spending $5,000/month today will require over $10,400/month in future dollars in 25 years just to sustain the exact same standard of living.
3. The 4% Safe Withdrawal Rule
The Trinity Study established that withdrawing 4% of your starting retirement portfolio (adjusted annually for inflation) gives an equity-heavy portfolio an estimated 95%+ probability of lasting at least 30 years without premature exhaustion.
4. Multi-Scenario Risk Modeling
Stock and bond market returns are variable rather than linear. By modeling conservative (expected − 2.5%) and optimistic (expected + 2.5%) market environments, you can stress-test whether your savings strategy holds up during lower-return decades.
Frequently Asked Questions
How does this retirement simulator account for inflation?
The simulator calculates both nominal future dollar amounts and real purchasing power in today’s dollars. Your desired retirement income is adjusted for compounding inflation over your working years to calculate the exact future nest egg needed at retirement.
What safe withdrawal rate is used to estimate monthly retirement income?
By default, the simulator uses the widely recognized 4% safe withdrawal rule (25× annual expenses), which historically sustains retirement portfolios across 30-year retirement horizons. You can also customize the withdrawal percentage to see conservative (3.5%) or flexible (4.5%) outcomes.
What does the shortfall and required monthly investment indicate?
If your projected corpus falls below your inflation-adjusted target, the shortfall displays the dollar deficit. The simulator automatically calculates the exact additional monthly contribution required starting today to eliminate that deficit by retirement age.
What are the Conservative, Base, and Optimistic scenario trajectories?
Markets fluctuate year over year. The scenario chart visualizes your expected return trajectory alongside a conservative scenario (expected return − 2.5%) and an optimistic scenario (expected return + 2.5%) so you can plan for varying market conditions.