Long-term
Long-term Compoundinterest
Einstein called it 'the eighth wonder of the world'. See how time and reinvestment combine — adjust contribution, return and term and see your end capital instantly.
The math
Compound interest = return on return. A savings account of €100 at 5% simple interest gives €200 after 20 years. The same €100 at 5% compound interest gives €265 — and the gap explodes over longer horizons.
The formula this tool uses: monthly compounding with periodic contributions. Note: historical equity returns (S&P 500 ~10% nominal / ~7% real since 1926) are averages — not guarantees. Markets have decades of underperformance; that's not in this calc.