Compound Interest Calculator
Enter a starting amount, a monthly contribution and an interest rate to see your balance after any number of years.
Frequently asked questions
How does compound interest work?
Interest is added to the balance, so later interest is earned on earlier interest too. $10,000 plus $200 a month at 5% for 20 years grows to about $109,333, of which $51,333 is interest.
What is the rule of 72?
Divide 72 by the annual rate to estimate how many years money takes to double: about 14 years at 5% and 10 years at 7.2%.
Are taxes and inflation included?
No. Results are before taxes, fees and inflation, with interest compounded monthly.