Compound Interest Calculator
Compound interest earns interest on your interest. Enter a starting amount, a monthly contribution and an expected return to see how much you'll have, and how much of it is growth.
$500 a month at 7%
| Time | You put in | Balance |
|---|---|---|
| 10 years | $60,000 | $86,542 |
| 20 years | $120,000 | $260,463 |
| 30 years | $180,000 | $609,985 |
| 40 years | $240,000 | $1,312,407 |
Frequently asked questions
What is the rule of 72?
Divide 72 by the annual return to estimate how many years it takes to double your money. At 7%, money doubles in about 10 years.
What return should I use?
High-yield savings and CDs pay a fixed rate. For stock investments, long-run averages are often used, but returns vary year to year and are not guaranteed.