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Investment Growth Calculator
Deterministic projection + Monte Carlo simulation — see your median outcome and the range of realistic scenarios.
📋 Your investment
ℹHistorical S&P 500 nominal average ~10%; 7% is conservative. Monte Carlo uses 17% standard deviation (Damodaran NYU dataset 1928-2024).
✓ Projected value
Future value (nominal)
$197,577
Total contributed$82,000
Investment growth$115,577
Real value (today's dollars)$101,234
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Monte Carlo simulation
Run 1,000 trials with randomized annual returns to see a probability range — the same method used by Vanguard and Fidelity planning tools.
Growth milestones (deterministic)
Assumes a constant 7% annual return — your expected return entered above.
| Year | Contributed | Growth | Total (nominal) | Real value |
|---|---|---|---|---|
| 5 | $28,000 | $7,779 | $35,779 | $30,271 |
| 10 | $46,000 | $26,325 | $72,325 | $51,771 |
| 15 | $64,000 | $60,133 | $124,133 | $75,176 |
| 20 | $82,000 | $115,577 | $197,577 | $101,234 |
Rate data last updated July 2026 — verify before relying on it
Source: BLS Consumer Price Index (CPI-U), 12 months ending July 2026. Market rates move continuously. Figures on this page may be behind the current market — confirm the current rate with the source or your provider before making a decision.