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Monte Carlo Investment Simulator

Inputs

Starting amount of capital in your portfolio

Additional amount added to portfolio each year

Long-term average annual return percentage

Standard deviation of returns representing market risk

Number of years to simulate

Higher numbers provide more accurate results but take longer

Annual inflation percentage for inflation-adjusted projections

Results

Median Portfolio Value
50th percentile outcome: typical expected result
10th Percentile (Pessimistic)
90th Percentile (Optimistic)
Probability of Success
Outcome Range (10th-90th)
Real Median Value (Inflation-Adjusted)
Formula
Portfolio(t) = Portfolio(t-1) × (1 + R(t)) + Annual_Contribution, where R(t) ~ N(μ, σ²)
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