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Interactive Tool 01

Compound Interest Calculator

Model exponential portfolio trajectories. Adjust principal, recurring deposits, expected return, and time horizons with instant real-time visualization.

Presets:

Simulation Inputs

$10,000
$0$50k$100k
$1,000 / mo
$0$2,500$5,000
8.0%
2% (Conservative)8% (illustrative, nominal)15% (high, not a forecast)
20 Years
5 yrs20 yrs40 yrs
Monthly compounding

Illustrative projection. Assumes a constant annual return, contributions at the end of each month, and no taxes, fees, or inflation. Actual returns vary and can be negative. Educational content, not financial advice.

Projected Value
$638,288
Principal
$250,000
Interest
$388,288
Multiplier
2.55x
Compounded Growth
Principal Invested
Year 20: $638,288
$160k$319k$479k$638kYear 0Year 10Year 20
Crossover Milestone: Month 95 (Year 8)At Month 95 (~Year 8), the portfolio generates more monthly compound interest ($1,005) than your active monthly contribution ($1,000/mo). From this threshold forward, the asset works harder than your active labor.
Compounding is pure recursive mathematics.Learn how to configure your capital velocity in our free book.

Illustrative projection. Assumes a constant annual return, contributions at the end of each month, and no taxes, fees, or inflation. Actual returns vary and can be negative. Educational content, not financial advice.

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