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Compound Interest Calculator

Estimate how a starting balance and regular contributions could grow over time based on a constant annual return and compounding method. Results are educational projections, not a guarantee of future returns or investment advice.

Initial amount ($)

Enter $0 to $10,000,000.

Contribution amount ($)

Enter $0 to $100,000.

Contribution frequency

Annual return (%)

Enter 0% to 50%.

Reference: HYSA ~4-5% · CDs ~4-5% · S&P 500 historical avg ~7–10% (not guaranteed)

Years

Enter a whole number between 1 and 50.

Compounding frequency

Estimated final balance

Total contributed

Interest earned

Interest as % of final balance

Year-by-year projection (estimated)

Year	Start Balance	Contributions	Interest Earned	End Balance

Projections are based on user inputs and simplified assumptions. Actual performance can be higher or lower.

This calculator is for general educational purposes only and does not constitute investment, financial, legal, or tax advice. Consult a qualified financial professional before making savings or investment decisions.