Compound Interest Calculator
Watch your money grow. Enter your starting amount, annual interest rate and time period to see the maturity value and how much of it is interest earned.
Compound Interest Calculator
Maturity value, interest earned and growth over time.
What your money will be worth at the end of the period.
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How to use this calculator
Enter the amount you invest, the annual interest rate and how many years you will leave the money to grow. Choose how often interest is compounded, then press Calculate. The result shows the maturity value and how much of it is interest, with a bar showing the split between your principal and the interest earned.
Formula
Where A is the maturity value, P is the principal, r is the annual interest rate (as a decimal), n is the number of times interest is compounded per year and t is the time in years.
Frequently asked questions
What is compound interest?
Compound interest is interest earned on both your original amount and the interest already added. That is why money grows faster over time than with simple interest.
Does compounding more often make a big difference?
It helps a little — monthly compounding gives slightly more than annual compounding at the same rate. Time and the interest rate matter far more than the frequency.
What is the difference between simple and compound interest?
Simple interest is calculated only on the original amount. Compound interest is calculated on the amount plus the interest already earned, so your money grows faster, especially over long periods.