📈 Compound Interest Calculator
See your investment grow over time with compound interest and optional monthly contributions.
—future value
How to use the Compound Interest Calculator
Compound interest is interest paid on both your original principal and on accumulated interest. The longer it compounds, the more dramatic the effect. This is why starting investing in your 20s vs your 40s makes a 5-10x difference in retirement assets.
Enter your initial lump-sum, expected annual return rate (S&P 500 historical average ~10%), years of investing, and any monthly addition.