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About the Compound Calculator
This compound calculator shows how an investment, savings balance, or loan grows under compound interest. Enter your principal, rate, and time, and you get the final balance, total interest, and a year-by-year breakdown with a growth chart.
The calculation uses the standard compound interest formula A = P(1 + r/n)^(nt), where P is the principal, r is the annual rate, n is the number of compounding periods per year, and t is the time in years. You can choose daily, monthly, quarterly, or annual compounding and add regular contributions for a savings plan. More frequent compounding produces slightly higher returns on savings, so compare frequencies with your own numbers. For major decisions, consider a financial professional.
- Enter your starting amount and the annual interest rate.
- Select a compounding frequency and set the time period in years.
- Run the calculation and review the year-by-year table and chart.