Compound Interest Calculator
Calculate how your investments grow over time with the power of compound interest.
Enter values above to see results
How to use this calculator
Enter your assumptions above and review how projected outcomes change as you adjust contribution amount, rate of return, timeline, or withdrawal values. Testing conservative, moderate, and optimistic scenarios can help you understand a realistic range of possible results.
Start by using realistic estimates based on your personal situation. If unsure about expected returns, use historical average returns but recognize that past performance does not guarantee future results. You can experiment with different assumptions by changing one variable at a time and observing how each factor affects your outcome. This helps build intuition for how contributions, time horizon, and rate of return interact.
Assumptions and limitations
Calculator outputs are educational projections, not guarantees. Real outcomes can differ due to market volatility, inflation, taxes, fees, and personal circumstances. Use these estimates as planning support and combine them with broader research before making financial decisions.
This calculator assumes consistent investment behavior, reinvested returns, and doesn't account for withdrawals beyond those specified or emergency changes to your plan. For a personalized financial plan, consult with a qualified financial advisor who can review your complete situation. Our goal is educational—to help you understand the mechanics of compound growth and the impact of key variables on long-term wealth building.
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What is Compound Interest: How Small Investments Grow Into Wealth">Compound Interest Calculator for a 10-Year Plan">Compound Interest?
Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods. It’s often called “interest on interest” and is one of the most powerful concepts in investing.
How to Use This Calculator
Enter your initial investment amount, monthly contribution, expected annual interest rate, and the number of years you plan to invest. The calculator will instantly show your projected total value, total contributions, and interest earned.