Compound Interest Calculator
Calculate how your savings grow with compound interest across different compounding frequencies.
Before you calculate
A constant return is a mathematical scenario, not an investment forecast. Taxes, fees and market volatility are excluded.
Compound Interest Formula
A = final amount, P = principal, r = annual rate (decimal), n = compounding periods per year, t = time in years.
Balance per period = Previous balance × (1 + periodic rate) + deposit at the modeled deposit timeExample Scenarios
Long-Term Savings
Investing $10,000 at 7% compounded monthly for 30 years grows to over $81,000 — more than 8x your initial deposit — simply through the power of compounding.
Regular Contributions
Adding $200/month to a $5,000 principal at 6% compounded monthly for 20 years results in nearly $100,000, with contributions totaling only $53,000.
Sources & calculation notes
Maintained by MoneyCalc. Results are estimates based on the inputs and assumptions shown, not personalized financial advice or a lender quote. Default rates are examples unless a specific tax year or official table is identified.
References explain the underlying concepts or rules. They do not endorse or independently certify this implementation.
Calculations run in your browser. Some tools retain settings on this device. Displayed rounding can produce small differences from a statement or contract.